Srikanth Jeeva's Ruby Blog

Caching in Rails

2011-12-03T09:06:00.001-08:00

Rails has wonderful inbuilt caching methods. This is how i implemented caching for a particular action.

Requirement : Cache a page for 12 hours. After 12 hrs Caching must expire.

before_filter :clear_cache
caches_action :index, :layout => false

def index
    #code
    # Write expiry time to cache (12 hours)
    Rails.cache.write('expiry_time', Time.now + 12.hours)
end

def clear_cache
    #Fetch time from cache and check with current time
    t = Rails.cache.fetch('expiry_time') || Time.now
    t = Time.parse(t) if t.is_a?(String)
    # Expire action if current time > Cached time
    expire_action :action => :index if Time.now > t
end

Thanks!

Roles implemented with easy_roles plugin

2011-11-08T09:00:00.001-08:00

Plugin git repo : https://github.com/platform45/easy_roles

Step 1 : Install Plugin

script/plugin install git://github.com/platform45/easy_roles.git

Step 2 : Generate migration to create column called roles in user's table

rails g easy_roles user roles

Step 3 : Run. rake db:migrate to run the migration

Step 4 : Add this line to the user's model

class User < ActiveRecord::Base
  easy_roles :roles
end

Add users role, remove, check role as follows.

@user = User.first

@user.add_role 'admin'

@user.is_admin?

=> true

@user.has_role? 'admin'

=> true

@user.is_awesome?

=> false

@user.add_role 'awesome'

@user.is_awesome?

=> true

@user.remove_role 'admin'

@user.is_admin?

=> false

How to fix Unrecognized command line argument: 'package'

2011-10-27T08:28:00.000-07:00

>> rvm package install zlib
ERROR: Unrecognized command line argument: 'package' ( see: 'rvm usage' )

The keyword 'package' is renamed to 'pkg'

Try,

>> rvm pkg install zlib

Njjoy :)

How to fix 'make' is not recognized as an internal or external command

2011-08-23T23:28:00.000-07:00

Hi,

I have got this below error.

$ gem install rhodes-3.1.0.gem -l

Building native extensions. This could take a while...

ERROR: Error installing rhodes-3.1.0.gem:

ERROR: Failed to build gem native extension.

c:/InstantRhodes/ruby/bin/ruby.exe extconf.rb

make

'make' is not recognized as an internal or external command,

operable program or batch file.

Gem files will remain installed in c:/InstantRhodes/ruby/lib/ruby/gems/1.8/gems/

rhodes-3.1.0 for inspection.

Results logged to c:/InstantRhodes/ruby/lib/ruby/gems/1.8/gems/rhodes-3.1.0/ext/

gem_make.out

Here is the Fix:
install Devkit for windows by following the steps,
https://github.com/oneclick/rubyinstaller/wiki/development-kit

--
Srikanth

Rhodes + Blackberry + Fixing error + No such file or directory Simulator

2011-08-18T22:23:00.000-07:00

Hi,

I have got this error No such file or directory 'Simulator'

ltadmin@LT008029 ~/projects/SocialTango_Mobile (master)

$ rake run:bb

rake/rdoctask is deprecated. Use rdoc/task instead (in RDoc 2.4.2+)

$use_sqlite : false

rake aborted!

No such file or directory - C:/bb/5.0.0.621_9650/simulator

This is how to Fix this,

Fix 1. Check if you have installed the Blackberry JDE. If you have installed Blackberry JDE there will be a simulator folder and MDS folder inside the installed directory. (In case if you have not installed JDE, here is where you need to download http://us.blackberry.com/developers/javaappdev/javadevenv.jsp)

Fix 2. If you have installed JDE and got the error. Go to Rhodes installation path and find the rhobuild.yml. In my system the path is,

C:\InstantRhodes\ruby\lib\ruby\gems\1.8\gems\rhodes-3.0.2\rhobuild.yml

check if this paths are correct in rhobuild.yml:

    6.0:
      jde: C:/Program Files/Research In Motion/BlackBerry JDE 6.0
      mds: C:/Program Files/Research In Motion/BlackBerry JDE 6.0/MDS
      sim: 9800

Installing Rhodes, Running app in Blackberry Simulator in windows

2011-08-18T03:05:00.000-07:00

1. Download the Instant Rhodes installer from http://docs.rhomobile.com/rhodes/install#install-on-windows and install it. This will install Ruby, Rhodes.

2. Download the Blackberry JDE from http://us.blackberry.com/developers/javaappdev/javadevenv.jsp

Note : For this you will need to create account and login to the blackberry website.

3. Create a sample rhodes app.

rhodes app myspace

4. Go to build.yml in the app, and change the version for blackberry,.

bbver: 6.0

5. do 'rhodes-setup' for adding Java path

$ rhodes-setup
We will ask you a few questions below about your dev environment.
JDK path (required) (C:/Program Files/Java/jdk1.6.0_21): C:/Program Files/Java/j
dk1.6.0_21

for other paths just skip.

6. Go to Rhodes installation path and find the rhobuild.yml. In my system the path is,

C:\InstantRhodes\ruby\lib\ruby\gems\1.8\gems\rhodes-3.0.2\rhobuild.yml

add this lines in rhobuild.yml for blackberry version 6.0

    6.0:
      jde: C:/Program Files/Research In Motion/BlackBerry JDE 6.0
      mds: C:/Program Files/Research In Motion/BlackBerry JDE 6.0/MDS
      sim: 9800

7. Run the app., rake run:bb

This opens blackberry simulator. Now find your app in the apps menu.

Cheers!

Rhodes + Setup Android in windows + problems

2011-08-16T03:52:00.000-07:00

Error 1 :

invalid command-line parameter: Files\Android\android-sdk\tools/emulator-arm.exe.
Hint: use '@foo' to launch a virtual device named 'foo'.
please use -help for more information

Fix:
This problem is when you install Rhodes in the path "c:/Program Files/Android/android-sdk" as there is a space in the word "Program Files". Try reinstalling to path "c:/Android/android-sdk"

Error 2 :
sh.exe": /c/InstantRhodes/ruby/bin/rake: C:/RhoSync/ruby/bin/ruby.exe^M: bad interpreter: No such file or directory

Fix : reinstall the rake gem.

1. gem uninstall rake
2. gem install rake

This will update the rake Gem

Error 3 : Cannot find your Rhodes gem or source path.

Fix : run this in terminal. this will set up the rhodes path

$ set-rhodes-sdk
c:/InstantRhodes/ruby/lib/ruby/gems/1.8/gems/rhodes-3.0.2/bin

Rails - Calendar date select in 3 simple steps

2011-06-01T07:01:00.000-07:00

1. Install plugin

script/plugin install http://calendardateselect.googlecode.com/svn/tags/calendar_date_select

2. Include JS & CSS to your layout file

<link href="/stylesheets/calendar_date_select/blue.css" media="screen" rel="stylesheet" type="text/css" />

<script src="/javascripts/calendar_date_select/calendar_date_select.js" type="text/javascript"></script>

3. Calendar date select tag

<input type="text" name="user[date_of_birth]" size="30" autocomplete="off" onselect="new CalendarDateSelect( this, {year_range:50} );" onclick="new CalendarDateSelect( this, {year_range:50} );" value="<%= Date.today %>"/>

Restart the server as the plugin has been installed! Calendar date select works!

Notes :
1. If you wish to turn on the time, use this => new CalendarDateSelect( this, {year_range:50, time:true} );

2. Adding (autocomplete="off") turns off the auto complete

RubyConfIndia - May 28, 29 - 2011

2011-05-29T23:47:00.000-07:00

Team Kaverisoft

Rails 3 - rake aborted! undefined method `task' for #

2011-05-24T04:10:00.000-07:00

Hi,

In Rails 3. there was a problem with rake 0.9.0 gemset.

When i do rake db:create I got the following error,

undefined method `task' for #

The fix is as follows,

go to config/application.rb file.

Add this line inside the class,

include Rake::DSL

That fixed the problem

Helper method to display number in money format - number_with_delimiter

2011-04-06T04:13:00.000-07:00

Examples

number_with_delimiter(12345678) # => 12,345,678
number_with_delimiter(12345678.05) # => 12,345,678.05
number_with_delimiter(12345678, :delimiter => ".") # => 12.345.678
number_with_delimiter(12345678, :separator => ",") # => 12,345,678
number_with_delimiter(12345678.05, :locale => :fr) # => 12 345 678,05
number_with_delimiter(98765432.98, :delimiter => " ", :separator => ",")

Source : http://apidock.com/rails/ActionView/Helpers/NumberHelper/number_with_delimiter

Learn :
Agile Web Development with Rails | Beginning Rails 3

Will Paginate - Array Pagination

2011-02-17T06:06:00.000-08:00

Wanna paginate an Array using will paginate.. Here is how i did..

Add this as method,

Array.class_eval do
def paginate(page=1, per_page=15)
pagination_array = WillPaginate::Collection.new(page, per_page, self.size)
start_index = pagination_array.offset
end_index = start_index + (per_page - 1)
array_to_concat = self[start_index..end_index]
array_to_concat.nil? ? [] : pagination_array.concat(array_to_concat)
end
end

And with the array @results do @results.paginate

reference: http://www.devchix.com/2007/07/23/will_paginate-array/

Regards,
Srikanth
Learn to Program with Ruby | Ruby Pocket Reference

Ruby Sorting Manually by created at

2011-02-16T02:46:00.000-08:00

Hi,

I have used this for sorting manually.

@results.sort{|x, y| x.send(:created_at) <=> y.send(:created_at)}

P.S. @results is an array tht has many records.

Concepts and Code

Rails + Google Map V3 with Marker, Bounds

2011-02-15T00:09:00.000-08:00

Hi I have used this function to load Google map with Marker and bounds.

function initialize(lat, lon, div_id) {
var myLatlng = new google.maps.LatLng(lat, lon);
var myOptions = {
zoom: 8,
center: myLatlng,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
var bounds = new google.maps.LatLngBounds ();
var map = new google.maps.Map(document.getElementById(div_id), myOptions);
var trucklatlng = new google.maps.LatLng(lat,lon);
var marker = new google.maps.Marker({
position: trucklatlng,
map: map,
title:"Assist"
});
var LatLngListFake1 = new google.maps.LatLng(lat + 0.005 , lon + 0.005);
var LatLngListFake2 = new google.maps.LatLng(lat - 0.005, lon - 0.005);
bounds.extend(LatLngListFake1);
bounds.extend(LatLngListFake2);
map.fitBounds (bounds);
}

In the View File:

Just call,

<script>initialize(lat, lon, div_id)</script>

Rails - Active Record - Save without callbacks

2011-02-09T07:21:00.000-08:00

Rails - Active Record - Save without callbacks

p = Post.first
p.title = "test"
p.send(:update_without_callbacks)

Exporting as CSV file in RAILS.

2011-02-03T03:39:00.000-08:00

I have used Fastercsv gem to generate csv data and used send_data method..

def create_csv
@customers = Customer.all
csv_string = FasterCSV.generate do |csv|
csv << ["First Name", "Last Name", "Email", "Home Phone", "Alternate Phone", "Address Line1", "Address Line2", "City", "State", "Zip"]
@customers.each do |customer|
csv << [customer.firstname, customer.lastname, customer.email, customer.home_phone_number, customer.cell_phone_number, customer.address_line1, customer.address_line2, customer.city, customer.state, customer.zip]
end
end
send_data csv_string, :filename => "customers.csv" , :type=>"text/csv"
end

Jquery Checkbox on click - enable/disable Items

2011-01-24T00:13:00.000-08:00

I have used this code to enable/disable textboxes in the onclick of a Checkbox

$('#by_cheque').click(function() {
if ($('#by_cheque').is(':checked')) {
$('#payable_name').removeAttr('disabled');
} else {
$('#payable_name').attr('disabled', 'disabled');
}
});

cartographer - Google map API v3 plugin in rails

2011-01-11T20:58:00.000-08:00

Hi all,

For using Google map v3, i always used with Javascript v3 provided by google. I didn't know there is an awesome plugin like this. anyways its not late.. Here is the GIT repo for it.

https://github.com/parolkar/cartographer

Also anyone knows more about Google map API plugins pls share ..

Refresh Page with Javascript

2011-01-06T22:37:00.000-08:00

Hi I have used the following JS for page refresh automatically.

function timedRefresh(timeoutPeriod) {
setTimeout("location.reload(true);",timeoutPeriod);
}

<body onload="JavaScript:timedRefresh(120000);">

// 12000 - 2 minutes
// 100 - 1 second

Registering your App in Facebook

2011-01-06T05:36:00.000-08:00

1. Register your APP here http://developers.facebook.com/setup , for local use your local URL ex). http://localhost:3000/
2. Click Submit, and once registered it will take you to a page.
3. In that click on Developer Dashboard.
4. Check if your Site URL.
5. Copy your App credentials to your App yml file.

fb_api_key: {your api key}
fb_secret: {your fb secret}
fb_app_id: {your app id}

A super simple Facebook Open Graph API client

2011-01-04T21:38:00.000-08:00

For Facebook Graph API client. I checked a gem 'rest-graph'

Here is the git repo https://github.com/godfat/rest-graph

Authentication with Facebook, Twitter, etc

2011-01-04T21:35:00.000-08:00

Hi,

I have came across this gem authlogic-connect.

https://github.com/viatropos/authlogic-connect

This provides Authentication with twitter, facebook, google, yahoo, myspace, vimeo, linked_in

Rails Calendar date select without Image

2010-12-31T06:01:00.000-08:00

Hi.

calendar_date_select plugin uses the following tag,

<%= calendar_date_select_tag "start_date", Time.now, :size => 15 %>

The above tag gives a text box and an Image. Which i really don't need.

I have called the onclick function which was written in the image onclick with text box as follows,

<input type="text" name="start_date" onclick="new CalendarDateSelect( this, {year_range:10} );" />

Date Select work fine now with image.

MiniMagick - undefined method `output'

2010-12-27T22:30:00.000-08:00

I have got error like this in attachment fu while uploading image and creating thumbnail,

NoMethodError (undefined method `output' for #<MiniMagick::CommandBuilder:0xb14dde4>):

I changed my Minimagick gem version to 1.2.5 and things worked fine..

jQuery UI datepicker in Rails

2010-12-09T03:45:00.000-08:00

I have spent lot of time in making this. The problem was there was conflict in the prototype & Jquery. This is how i did it,

Step 1:

Download jquery.ui.datepicker.js from jquery UI and add it in Javascripts folder.

Step 2 :

Add these in Layout,

<script src="/javascripts/jquery.js" type="text/javascript"></script>
<script src="/javascripts/jquery.ui.datepicker.js"></script>
<script>
jQuery(function() {
jQuery("#datepicker").datepicker();
});
</script>

Note: instead of $(function) i have used jQuery(function)

Step 3 :

Then the View file, use,
<%= text_field_tag "datepicker" %>

Note :

If you get this error, "jquery ui $(input).zIndex is not a function"

1. Go to the datepicker JS & comment out the line where you get the error.
2. Add .ui-datepicker {z-index: 3000;} in ur stylesheet

Design your Site with Jquery UI

2010-12-08T23:26:00.000-08:00

Jquery UI themeroller gives various themes and also we can customize and download.

http://jqueryui.com/themeroller/

It also gives various options like Datepicker, Accordian, Autocomplete etc.

Just select your theme, customize if you want & click Download Theme. Things will be in your hand.

Will Paginate Ajax pagination

2010-12-08T23:09:00.000-08:00

I have gone through many articles on how to use Ajax pagination with will_paginate.

Here is how i did & it worked for me,

Step 1 :
Create a helper called remote_link_renderer.rb and use the following code,

class RemoteLinkRenderer < WillPaginate::LinkRenderer
def prepare(collection, options, template)
@remote = options.delete(:remote) || {}
super
end

protected
def page_link(page, text, attributes = {})
@template.link_to_remote(text, {:url => url_for(page), :method => :get}.merge(@remote), attributes)
end
end

Step 2:
Make the view file table in a partial(_units.html.erb),

<div id="units">
<%= render :partial => "units" %>
</div>

Step 3 :

And in the partial _units.html.erb add will paginate code,
<%= will_paginate @units, :renderer => 'RemoteLinkRenderer' , :remote => { :update => 'units'} %>

Step 4 :

In the controller use:

respond_to do |format|
format.js { render :partial => 'units' }
format.html { }
end

Now Pagination works without refreshing the page.

Will paginate pagination style

2010-12-08T21:53:00.000-08:00

Pagination using will paginate comes with div class "pagination"

Copy & paste the below code in css file, to make the pagination look a better.

.pagination {
padding:0.3em;
text-align:right;
}
.pagination a, .pagination span {
padding:0.2em 0.5em;
}
.pagination span.disabled {
color:#AAAAAA;
}
.pagination span.current {
color:#8FBF5D;
font-weight:bold;
}
.pagination a {
border:1px solid #DDDDDD;
color:#0063DC;
text-decoration:none;
}
.pagination a:hover, .pagination a:focus {
-moz-background-clip:border;
-moz-background-inline-policy:continuous;
-moz-background-origin:padding;
background:#0063DC none repeat scroll 0 0;
border-color:#003366;
color:white;
}
.pagination .page_info {
color:#AAAAAA;
padding-top:0.8em;
}
.pagination .prev_page, .pagination .next_page {
border-width:1px;
}

Send Ajax request after Auto Complete text box - after_update_element

2010-12-07T01:12:00.000-08:00

Continuation for my previous post about Auto complete plugin

I have used after_update_element to send the value that is selected in the Auto complete

<%= text_field_with_auto_complete 'phonenumber', 'to',{:size=>25, :class=> "text ui-widget-content ui-corner-all", :value=>@service_order.phonenumber}, {:skip_style => false, :after_update_element=> "function(element,value){new Ajax.Request('/controller/action', {asynchronous:true, evalScripts:true, method:'get', parameters:'number=' + $('phonenumber_to').value }); return false;
}"} %>

Auto Complete Text Box in Rails

2010-11-26T04:54:00.000-08:00

Found an Awesome plugin https://github.com/rails/auto_complete for doing this and i made it in 5-10 mins.

Install plugin :

ruby script/plugin install git://github.com/rails/auto_complete.git

Use in HTML for Text field:
<%= text_field_with_auto_complete 'phonenumber', 'to',{}, :skip_style => false %>

Controller :

skip_before_filter :verify_authenticity_token, :only => [:auto_complete_for_phonenumber_to]

def auto_complete_for_phonenumber_to
phonenumber = params[:phonenumber][:to]
@phones = CustomerPhone.phonenumber_search(phonenumber)
render :partial => 'phonenumbers'
end

Search Query in model:

def self.phonenumber_search(keyword)
find(:all, :conditions=>["phonenumber like ?", "%#{keyword}%"])
end

View :

Create Partial : "_phone_number.html.erb"

<%= auto_complete_result @phones, :phonenumber %>

Restart your Server & Search. It works.

Note :
If you get undefined method "text_field_with_auto_complete" Error. It means you have not installed the plugin or have not restarted server.

Need to show more than one field ??
Here it is,

In View:
<%= auto_complete_result @phones, :show_field %>

In Model:

def show_field
"#{phonenumber}, #{name}, #{address}"
end

In auto_complete_result method:

items = entries.map { |entry| content_tag("li", phrase ? highlight(entry.show_field, phrase) : h(entry.show_field)) }

Regards,
Srikanth

Books: Agile Web Development with Rails | Ruby on Rails For Dummies | Beginning Ruby: From Novice to Professional

HTML stripping, Truncating string in Ruby, Rails

2010-10-24T23:52:00.000-07:00

For Truncating String I have used 'truncate' rails helper method.

Ex) limiting to 10 characters
truncate("im srikanth glad to meet you", 10)
>> "im srik..."

For HTML stripping,

I have used gsub..

str.gsub(/<\/?[^>]*>/, "")

Weekday or not..

2010-10-03T23:07:00.000-07:00

You can Use this ,

def weekday?
(1..5).include?(wday)
end

check ..

d = Date.today
=> Mon, 04 Oct 2010
d.weekday?
=> true
d = Date.today - 1
=> Sun, 03 Oct 2010
d.weekday?
=> false

Rails find_by_sql returns object ??

2010-09-29T04:55:00.000-07:00

you can use this,

ActiveRecord::Base.connection.select_value("sql query")

Installing pauldix-feedzirra

2010-09-07T23:14:00.000-07:00

Hi when i tried to install pauldix-feedzirra, i got the below error.

sudo gem install pauldix-feedzirra
Building native extensions. This could take a while...
ERROR: Error installing pauldix-feedzirra:
ERROR: Failed to build gem native extension.

/usr/local/bin/ruby extconf.rb
checking for libxml/parser.h... yes
checking for libxslt/xslt.h... no
-----
libxslt is missing. please visit http://nokogiri.org/tutorials/installing_nokogiri.html for help with installing dependencies.
-----
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.

Provided configuration options:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=/usr/local/bin/ruby
--with-zlib-dir
--without-zlib-dir
--with-zlib-include
--without-zlib-include=${zlib-dir}/include
--with-zlib-lib
--without-zlib-lib=${zlib-dir}/lib
--with-iconv-dir
--without-iconv-dir
--with-iconv-include
--without-iconv-include=${iconv-dir}/include
--with-iconv-lib
--without-iconv-lib=${iconv-dir}/lib
--with-xml2-dir
--without-xml2-dir
--with-xml2-include
--without-xml2-include=${xml2-dir}/include
--with-xml2-lib
--without-xml2-lib=${xml2-dir}/lib
--with-xslt-dir
--without-xslt-dir
--with-xslt-include
--without-xslt-include=${xslt-dir}/include
--with-xslt-lib
--without-xslt-lib=${xslt-dir}/lib

Gem files will remain installed in /usr/local/lib/ruby/gems/1.8/gems/nokogiri-1.4.3.1 for inspection.
Results logged to /usr/local/lib/ruby/gems/1.8/gems/nokogiri-1.4.3.1/ext/nokogiri/gem_make.out

Then, I installed dependencies,

sudo apt-get install libxml2-dev
sudo apt-get install libxslt-dev

Now tried

sudo gem install pauldix-feedzirra

Worked fine!!

Problems in Installing Curb in ubuntu

2010-09-07T22:56:00.000-07:00

Just install the below lib files,

sudo apt-get install libcurl3 libcurl3-gnutls libcurl4-openssl-dev

& then,

sudo gem install curb

It works!

-- source - http://axonflux.com/curb-install-problems-on-ubunt

Sending HTML mail in rails

2010-09-07T00:26:00.001-07:00

Hi pals,

If all the mails that you send are in HTML format. its simple. Specify this line in environment.rb

ActionMailer::Base.default_content_type = "text/html"

If only one action has to be in HTML mail, specify 'content_type' in that action.

content_type "text/html"

example,

def signup_notification(recipient)
recipients recipient.email_address_with_name
subject "New account information"
from "system@example.com"
content_type "text/html"
end

cheers,
Sri

select box Send Id, display name..

2010-08-30T21:07:00.000-07:00

Hi,

used this to send the ID in params & display name in the select box.

select_tag "user", options_from_collection_for_select(User.all, :id, :name)

For adding option & showing selected params,

select_tag "user_id", "<option>select one</option>" + options_from_collection_for_select(User.all, :id, :name, params[:user_id].to_i)

--
sri.

Image submit tag without border

2010-08-19T00:07:00.000-07:00

Hi, I used image_submit_tag to submit my form. worked fine.. but the
image is displayed with border.

I used border => 0 but no use.

This is was code.

<%= image_submit_tag "../images/upload.png", :border => 0 %>

& This worked

<%= image_submit_tag "../images/upload.png", :style => "border: none;" %>

-
Sri

You are being redirected

2010-07-23T06:19:00.000-07:00

Hi,

I have got this page "You are being redirected", whenever i used redirect. I found out that I have written methods such as redirect_XXX, redirect_yyy. I have changed the method names & it works !!

Not using the rails keywords as method names, stops this bug..

Thanks,
Srikanth

Auto Login in rails

2010-06-29T07:47:00.000-07:00

1. Remember me

When the user login and checks the “Remember me” checkbox, the :save_login parameter is set, the User instance remember_me method invoked and the :auth_token cookie set...

class AccountController < ApplicationController
def login
case @request.method
when :post
if @session[:user] = User.authenticate(@params[:user_login], @params[:user_password])
flash['notice'] = "Login successful"
if @params[:save_login] == "1"
@session[:user].remember_me
cookies[:auth_token] = { :value => @session[:user].remember_token , :expires => @session[:user].remember_token_expires }
end
redirect_back_or_default :controller => "time"
else
flash.now['notice'] = "Login unsuccessful"
@login = @params[:user_login]
end
end
end

def logout
@session[:user].forget_me if @session[:user]
@session[:user] = nil
cookies.delete :auth_token
end
end

2. login_from_cookie

The next time the user visits the website the “login_from_cookie” filter is triggered. This method checks that the user is not logged in and that the :auth_token cookie is set. If that’s the case the user matching the :auth_token is searched and the token_expiration verified the the user is automatically logged in. Et voila! I guess auto_login would be more appropriate as method name.

class ApplicationController < ActionController::Base
before_filter :login_from_cookie
def login_from_cookie
return unless cookies[:auth_token] && @session[:user].nil?
user = User.find_by_remember_token(cookies[:auth_token])
if user && !user.remember_token_expires.nil? && Time.now < user.remember_token_expires
@session[:user] = user
end
end
end

3. the User class

The User class has two methods to set and remove the token from the database. It’s pretty secure as from the token the user cannot be identified without having the salt, the email, and the token expiration, which is most unlikely to be recreated. It could be even more secure by just encrypting some random unique identifier. The only issue I encountered was that the user class always forces the password validation and encryption when saving. For now I just bypass validation and encryption when setting and clearing the remember_me token.

class User < ActiveRecord::Base
def remember_me
self.remember_token_expires = 2.weeks.from_now
self.remember_token = Digest::SHA1.hexdigest("#{salt}--#{self.email}--#{self.remember_token_expires}")
self.password = "" # This bypasses password encryption, thus leaving password intact
self.save_with_validation(false)
end

def forget_me
self.remember_token_expires = nil
self.remember_token = nil
self.password = "" # This bypasses password encryption, thus leaving password intact
self.save_with_validation(false)
end
end

FaceBook Javascript SDK Like button examples

2010-06-23T00:07:00.000-07:00

<h1>Defaults</h1>
<fb:like></fb:like>

<h1>Explicit href</h1>
<fb:like href="http://fbrell.com"></fb:like>

<h1>Custom Font</h1>
<fb:like font="trebuchet ms" href="http://fbrell.com"></fb:like>

<h1>Disable Faces</h1>
<fb:like show_faces="no" href="http://fbrell.com"></fb:like>

<h1>Button Count</h1>
<fb:like layout="button_count" href="http://fbrell.com"></fb:like>

<h1>Narrow</h1>
<fb:like width="200" href="http://fbrell.com"></fb:like>

<h1>Narrow no faces</h1>
<fb:like width="200" show_faces="no" href="http://fbrell.com"></fb:like>

<h1>Recommend</h1>
<fb:like href="http://fbrell.com"></fb:like>

<h1>Dark</h1>
<div style="background-color: black; padding: 10px;">
<fb:like colorscheme="dark" href="http://fbrell.com"></fb:like>
</div>

<h1>Dark Button SuscribeCount</h1>
<fb:like layout="button_count" colorscheme="dark" href="http://fbrell.com"></fb:like>

To Subscribe the likes

<script>
// this will fire when any of the like widgets are "liked" by the user
FB.Event.subscribe('edge.create', function(href, widget) {
Log.info('You liked ' + href, widget);
});
</script>

Source: http://developers.facebook.com/tools/console/ -> examples

using map with html images

2010-06-14T03:29:00.000-07:00

Wanna Use 1 image with 2 links??

<img src="/images/submit.png" width="219" height="59" border="0" usemap="#Map" />
<map name="Map" id="Map">
<area shape="rect" coords="17,15,218,44" href="http://www.google.com" />
<area shape="rect" coords="8,46,219,59" href="http://yahoo.com />
</map>

Making a http/https post request

2010-06-03T23:14:00.000-07:00

Spent an hour to find out how to send a https post request and this is how ..

require 'rubygems'
require 'net/http'
require 'net/https'
require 'uri'
http = Net::HTTP.new('facebook.com', 443)
http.use_ssl = true
path = "/oauth/access_token"
data = 'id=123456'
resp, data = http.post(path, data)
puts resp.inspect
puts data.inspect

Thanks,
Srikanth

Make ll command working in linux

2010-05-07T04:02:00.000-07:00

Hi,

Today I ve learnt how to make ll working in linux from my friend swanand.

do the following,

gedit ~/.bashrc

alias ll='ls -l'

save the file & close it.

This makes ll working in all new tabs in console.

Cheers,

Checking requirements in Routes

2010-04-27T03:51:00.000-07:00

Here by i have checked routes for domain_name with alpha-numeric.

map.home '/homes/:domain_name/:id',:controller=>'home', :action=>'new', :requirements => { :domain_name => /[A-Za-z0-9.]+/}

sending ajax request in rails

2010-04-16T05:04:00.000-07:00

Hi

Just for syntax, used this for sending ajax request..

new Ajax.Request('/controller/action', {asynchronous:true, evalScripts:true, method:'get', parameters:'params1=' + param + '&param2=' + param + '&param3=' + param }); return false;

Thanks,
Sri

sending ajax request in rails

2010-04-16T02:01:00.000-07:00

Find Number of mp3 files in a directory

2010-04-08T02:54:00.000-07:00

To Find Number of mp3 files in a directory,

I got this,

ls | grep .*.mp3 | wc -l

Thanks,
Srikanth

Thinking sphinx

2010-04-02T03:08:00.000-07:00

Hi,

This is a Great plugin in Rails for the search options. This comes with many inbuilt functionalities. There are many tutorials & Videos on how to work this.

But I struggled a lot in Installation.

1. I have installed the Thinking sphinx Plugin, But there was error

srikanth@client30:~/project$ rake thinking_sphinx:index

Sphinx cannot be found on your system. You may need to configure the following
settings in your config/sphinx.yml file:
* bin_path
* searchd_binary_name
* indexer_binary_name

For more information, read the documentation:
http://freelancing-god.github.com/ts/en/advanced_config.html
Generating Configuration to /home/srikanth/projects/

thisproject/config/development.sphinx.conf

Solution : You will have to download and install the sphinx software. Thinking sphinx is only a wrapper around sphinx.

You can get sphinx at http://sphinxsearch.com/

2) After I Install sphinx, when I start it
srikanth@client30:~/projects/

my project$ rake thinking_sphinx:start
(in /home/srikanth/projects/my project)
Failed to start searchd daemon. Check /home/srikanth/projects/my project/log/searchd.log.
Failed to start searchd daemon. Check /home/srikanth/projects/my project/log/searchd.log

Solution: you need to configure and start the sphinx daemon

rake thinking_sphinx:configure
rake thinking_sphinx:start

& This should work.. It worked for me when i did

rake thinking_sphinx:start -t

Now everything works fine :):)

Thanks,
Srikanth

Add a text to text box, hide when it is clicked, show when clicked out

2010-03-31T03:58:00.000-07:00

My Friend Ukesh gave me this code, thanks to him for saving my time.

<input name="q" id="search_text" type="text" value="- Search -" onfocus="clearDefaultText(this)" onblur="clearDefaultText(this)" style="background:none"/>
<script>
function clearDefaultText(field){

if (field.defaultValue == field.value) field.value = '';
else if (field.value == '') field.value = field.defaultValue;

}
</script>

Embed Flash - swf file in website

2010-03-23T05:19:00.000-07:00

ruby conference - India, Bangalore 2010

2010-03-21T00:17:00.001-07:00

Me @ Ruby conf, Bangalore. - 20-3-2010

Seasons Hall, Royal orchid. The great man sitting is ola bini

priya, me, veera, shiv, uthiravel

21-3-2010

updating blog & twitting

my Boss Senthil, Uthiravel, me

Very Excited meeting Obie Fernandez. wht a man!!! wht a programmer!!

File Extension

2010-03-02T04:00:00.000-08:00

Hi,

Wanna get file extension

filename.scan(/\.\w+$/)

select class not applied

2010-02-24T20:23:00.000-08:00

<span style="font-size:130%;">Hi, previously my code was like this,

I tried much using, html_options, options, but class is not applied for select.

<%= f.select 'difficulty', options_for_select({ "Easy" => "1", "Medium" => "3", "Hard" => "5"}, get_difficulty(@tour).to_s), :class =>'input_text' %>

& not other way i could find, i did by this way & it works fine now

<%= select :tour, :difficulty, { "Easy" => "1", "Medium" => "3", "Hard" => "5"}, {:selected=>get_difficulty(@tour).to_s}, :class=>"input_text" %>

Now class is applied!!!

Any other better way pls tel me,,.</span>

Getting a DB dump in local machine from server

2010-02-09T22:02:00.000-08:00

Getting a DB dump in local machine from server..

1. Login into the server - ssh username@server
2. mysqldump dbname -u dbusername -p > filename.sql
3. Logout of server

set path in local machine: Example - /home/Desktop

4. scp username@server:server_path/filename.sql dumpfile.sql

Thts it, now db dump is in local machine Desktop

Getting dump to local db,

mysql -u root -p
password: root
mysql> create database dbname
exit
mysql -u user -p dbname < dumpfile.sql

You’re in the middle of a conflicted merge (git)

2010-02-01T03:46:00.000-08:00

Problem
Trying to update (pull) in git causes the error ‘you’re in the middle of a conflicted merge’.

Solution
To be able to get out of this error try the followng:

git reset –hard HEAD
git fetch origin
git reset –hard origin

to reset the state, and then you should be able to use git pull as normal.

This site helped me when i faced this problem - http://www.42.mach7x.com/2009/11/24/youre-in-the-middle-of-a-conflicted-merge-git/

Generate random texts

2010-01-19T01:18:00.000-08:00

Hi,
I have used this method to generate random texts ....

def rendom_password
chars = ("a".."z").to_a + ("A".."Z").to_a + ("0".."9").to_a
newpass = ""
1.upto(7) { |i| newpass << chars[rand(chars.size-1)] }
end

Thanks,
sri

'Include' in rails query

2010-01-13T03:21:00.000-08:00

For getting a datum from 2 tables, I have used include as follows,

Admin:

belongs_to :user

User:

has_many :admins

There was a condition that i have to sort names of admins, where the names of admins will be in user table.

Hence,

Admin.find(:all, :include=>"user", :order => "users.name")

I felt this easy than sqls, & interesting

Select Helper Methods in Rails

2010-01-13T00:57:00.000-08:00

Hi,

Whenever i use a select Box in Rails, i have used this link.. This s really useful..

http://shiningthrough.co.uk/Select-helper-methods-in-Ruby-on-Rails

Thanks,
Srikanth

Tutorials: Ruby on Rails 3 Tutorial: Learn Rails by Example | Ajax on Rails | Rails 3 Way, The (2nd Edition) (Addison-Wesley Professional Ruby Series)

undefined method `relative_url_root' error

2009-12-23T22:53:00.000-08:00

Hi,

To clear the error ,make the followning change,

changed line no. 51 in asset_packager/lib/synthesis/asset_packager_helper.rb

err line: source = "#{ActionController::Base.asset_host}#{@controller.request.relative_url_root}#{source}"

changed_to :
source = "#{ActionController::Base.asset_host}#{ActionController::Base.relative_url_root}#{source}"

Github get Public Key, set user name

2009-12-23T21:43:00.000-08:00

Get Public Key:

ssh-keygen -t rsa

Set Username:

git config --global user.name "srikanth"

git config --global user.email "sri.jjhero@gmail.com"

Multiple Language implementation Using Google Translate

2009-11-27T03:38:00.000-08:00

Hi,

Just surfed through how to implement a multiple language App, & got this from google Translate..

Just add this code in your HTML Layout.

<div id="google_translate_element"></div><script>
function googleTranslateElementInit() {
new google.translate.TranslateElement({
pageLanguage: 'en'
}, 'google_translate_element');
}
</script><script src="http://translate.google.com/translate_a/element.js?cb=googleTranslateElementInit"></script>

PTS:
This works only inside the app, & not in a HTML file.

Source : http://translate.google.com/translate_tools?hl=en

Thanks,
Srikanth

Multiple Select boxes in Js

2009-11-26T23:15:00.000-08:00

I have gone through many examples for multiple select like this.

& what worked for me is i have given below,

http://www.box.net/shared/9lo1g8p3ei

Download the Js & Css from the above link.

Create a HTML file like this,

<script src="javascripts/moo.js" type="text/javascript"></script>
<script src="javascripts/multi_transfer.js" type="text/javascript"></script>
<link rel="stylesheet" type="text/css" href="stylesheets/multiple.css" />

<table>
<tr>
<td align="center">
<div class="holder" > <p>Exam List</p>
<select multiple="multiple" id="select1" name="select1[]">

<option value="1">one1</option>
<option value="2">one2</option>
<option value="3">one3</option>
<option value="4">one4</option>
<option value="5">one5</option>

</select>
<a href="javascript:;" id="add">add >></a>
</div>
</td>
<td align="center">
<div class="holder"><p>Selected Exam </p>
<select multiple="multiple" id="select2" name="selected_exam_list[]">
</select>
<a href="javascript:;" id="remove"><< remove</a>
</div>
</td>
</tr>
</table>

Reference & Demo : http://davidwalsh.name/dw-content/multi-select.php

Thanks,
Srikanth

Add Favicon in a webpage

2009-11-26T21:07:00.000-08:00

This is how we add Favicon in a webpage,

<link rel="SHORTCUT ICON" href="/images/favicon.ico" type="image/x-icon"></span>

Thanks,
Srikanth

Adding GEM sources

2009-11-17T23:00:00.000-08:00

sudo gem sources -a http://gems.github.com/

sudo gem sources -a http://gems.rubyonrails.org/

Action Web Service Gem

2009-11-17T21:38:00.000-08:00

hi i am using 'actionwebservice' for passing SOAP requests.

Version 2.3.2 for actionwebservice is " datanoise-actionwebservice"

For installing the gem when i used,

gem install datanoise-actionwebservice

got this error,
ERROR: could not find gem datanoise-actionwebservice locally or in a repository

& found this is the right way to install

gem install datanoise-actionwebservice --source http://gems.github.com

Add this line to your config/environment.rb file in the initializer section:

config.gem 'datanoise-actionwebservice', :lib => 'actionwebservice'

Generating API controller

ActionWebService gem includes web_service generator that you can use like this:

$ ./script/generate web_service post

Define your API

Open app/services/post_api.rb file and add methods that your service exposes:

class PostApi < returns =""> [[:string]]
end

API implementation

We are going to use direct dispatching mode, so all methods that implement our API go directly to PostController itself:

class PostController < ApplicationControllerwsdl_service_name 'Post'web_service_api PostApiweb_service_scaffold :invocation if Rails.env == 'development'def get_posts["Post 1", "Post 2"]endendwsdl url:

http://localhost:3000/post/wsdl

Books : Restful Web Services | Web Services Essentials (O'Reilly XML) | Web Services: Principles and Technology | RESTful Web Services Cookbook

Getting Next Existing Record in a DB

2009-11-10T01:47:00.000-08:00

Wondered how to do it,, & did it Using offset:

sql:

SELECT * FROM foo WHERE id = 4 OFFSET 1

Table Sorting Jquery Plugin

2009-09-24T01:13:00.000-07:00

Hi,

I was wondering how to sort a table. I got this plugin & did it in 10 mins.

Here is an useful plugin in jquery,

Reference URL : http://tablesorter.com/docs/#Download

Table sorting is pretty much easier using this tablesorter plugin.

Thanks,
Srikanth

MySQL Change root Password

2009-09-14T23:41:00.000-07:00

Source : http://www.cyberciti.biz/faq/mysql-change-root-password/

mysqladmin command to change root password

If you have never set a root password for MySQL, the server does not require a password at all for connecting as root. To setup root password for first time, use mysqladmin command at shell prompt as follows:

$ mysqladmin -u root password NEWPASSWORD

However, if you want to change (or update) a root password, then you need to use following command

$ mysqladmin -u root -p'oldpassword' password newpass

For example, If old password is abc, and set new password to 123456, enter:

$ mysqladmin -u root -p'abc' password '123456'

Change MySQL password for other user

To change a normal user password you need to type (let us assume you would like to change password for vivek):

$ mysqladmin -u vivek -p oldpassword password newpass

Changing MySQL root user password using MySQL sql command

This is another method. MySQL stores username and passwords in user table inside MySQL database. You can directly update password using the following method to update or change password for user vivek:

1) Login to mysql server, type following command at shell prompt:

$ mysql -u root -p

2) Use mysql database (type command at mysql> prompt):

mysql> use mysql;

3) Change password for user vivek:

mysql> update user set password=PASSWORD("NEWPASSWORD") where User='vivek';

4) Reload privileges:

mysql> flush privileges;
mysql> quit



Recover Mysql Password

http://www.cyberciti.biz/tips/recover-mysql-root-password.html

Thanks,
Srikanth

Polymorphic Association

2009-09-06T22:17:00.000-07:00

Reference : http://charlesmaxwood.com/ruby-on-rails-restful-links-when-you-dont-know-the-class/

Example :

restful routes:

map.resources :users
map.resources :groups

Model Relation:

class Post < ActiveRecord::Base
 belongs_to :owner, :polymorphic => true
end

class User < ActiveRecord::Base
 has_many :posts, :as => :owner
end

class Group
 has_many :posts, :as => :owner
end

Now, let’s say that when you show a post, you want to provide a link to the owner of the post when you display it on its show page. You know that because you’ve provided the restful routes in your config/routes.rb file as show above, you get the nice functionality of the user_path and the group_path methods. The problem is that because you don’t know if @post.owner is a user or a group.

<%= link_to @post.owner.name, polymorphic_path(@post.owner) %>

Documentation : http://railsbrain.com/api/rails-2.3.2/doc/index.html?a=M000261&name=polymorphic_path

Thanks,

Srikanth

string conversions

2009-08-17T04:42:00.000-07:00

>>> print "Before %s After" % 7
Before 7 After

>>> print "Before %x After" % 15
Before f After

>>> print "Foo %04d Bar" % 3*3
Foo 0009 Bar

text area tag in rails

2009-08-16T23:44:00.001-07:00

<%= text_area_tag(:message, nil, :size => "44x6") %>

jquery show, hide

2009-08-16T22:24:00.000-07:00

http://docs.jquery.com/Downloading_jQuery#Current_Release

current version of jquery can be downloaded here.

base 64 enocde/decode

2009-07-24T06:11:00.000-07:00

require 'base64'
puts Base64.decode64("aG1hYw==").chomp => hmac
puts Base64.encode64("hmac").chomp => aG1hYw==

Check Whether a test Credit Card is working.,

2009-07-09T20:34:00.000-07:00

require 'rubygems'
require 'active_merchant'

# Use the TrustCommerce test servers
ActiveMerchant::Billing::Base.mode = :test

# ActiveMerchant accepts all amounts as Integer values in cents
# $10.00
amount = 1000

# The card verification value is also known as CVV2, CVC2, or CID
credit_card = ActiveMerchant::Billing::CreditCard.new(
:first_name => 'Bob',
:last_name => 'Bobsen',
:number => '349298720353895',
:month => '8',
:year => '2012',
:verification_value => '1234'
)

puts credit_card.valid?

Getting Local ip Address

2009-07-01T23:39:00.000-07:00

require 'socket'
def local_ip
orig, Socket.do_not_reverse_lookup = Socket.do_not_reverse_lookup, true # turn off reverse DNS resolution temporarily

UDPSocket.open do |s|
s.connect '64.233.187.99', 1
s.addr.last

end
ensure
Socket.do_not_reverse_lookup = orig
end
p= local_ip
puts p

Get month names for the integer

2009-06-19T22:14:00.000-07:00

>> Date::MONTHNAMES[1]
=> "January"

some other date methods:
Date::ABBR_DAYNAMES
Date::ABBR_MONTHNAMES
Date::DAYNAMES

Thanks,
sri..

Adding data in add column

2009-06-18T23:03:00.000-07:00

 
Adding data in add column

 class AddPeopleSalary < ActiveRecord::Migration
   def self.up
     add_column :people, :salary, :integer
     Person.reset_column_information
     Person.find(:all).each do |p|
       p.update_attribute :salary, SalaryCalculator.compute(p)
     end
   end
 end

Amazon simple Payment in ruby on rails

2009-06-09T05:14:00.000-07:00

hi,
Amazon is Doing a great job in rails Payments.
here is the ruby code for generation of button.

require 'base64'
require 'openssl'
module PayNowWidgetUtils
def generate_signed_form(access_key, aws_secret_key, form_params)
form_params['accessKey'] = access_key
str_to_sign = ""
form_params.keys.sort.each { |k| str_to_sign += "#{k}#{form_params[k]}" }
digest = OpenSSL::Digest::Digest.new('sha1')
hmac = OpenSSL::HMAC.digest(digest, aws_secret_key, str_to_sign)
form_params['signature'] = Base64.encode64(hmac).chomp
signed_form =<<-STARTFORM
ENDFORM

return signed_form
end
end

include PayNowWidgetUtils
ACCESS_KEY = 'your amazon aws access key'
SECRET_KEY = 'your amazon aws secret key'
print generate_signed_form(ACCESS_KEY, SECRET_KEY,
'amount' => 'USD 100',
'description' => 'Test Button',
'referenceId' => 'txn1102',
'returnUrl' => 'http://localhost:3000/success',
'abandonUrl' => 'http://localhost:3000/fail')

amazon aws signup..
http://aws.amazon.com/

use a sandbox account for doing test case.

Get the list of sundays in a month

2009-05-26T23:50:00.000-07:00

require 'date'

class Date
def self.last_day_of_the_month yyyy, mm
d = new yyyy, mm
d += 42 # warp into the next month
new(d.year, d.month) - 1 # back off one day from first of that month
end

def self.print_sundays(d1, d2)
d1 +=1 while (d1.wday != 0)
d1.step(d2, 7) do |date|
puts "#{Date::MONTHNAMES[date.mon]} #{date.day}"
end
end
end

date = Date.today
month = date.strftime("%m").to_i
year = date.strftime("%Y").to_i

last_date = Date.last_day_of_the_month(year, month)
l_date = last_date.strftime("%d").to_i
Date.print_sundays(Date::civil(year, month, 1), Date::civil(year, month, l_date))

Jump to the top of a page

2009-05-20T04:01:00.001-07:00

Jump to the top of a page

http://www.dynamicdrive.com/dynamicindex5/jumptop.htm

this will help in making a top link in each page.

Connecting Db in ruby

2009-05-18T04:28:00.000-07:00

MYSQL_HOST, MYSQL_USER, MYSQL_PASS, MYSQL_DB_NAME = 'localhost', 'root', '', 'artiklz_development'
@@dbh = Mysql.real_connect(MYSQL_HOST, MYSQL_USER, MYSQL_PASS, MYSQL_DB_NAME)

check whether an url is working or not..

2009-05-17T22:20:00.000-07:00

1. For domains: ping "domain name"

2. For urls, use the following..

def check_valid_link(link_url)
retrycount = 0
begin
res = Net::HTTP.get_response(URI.parse(link_url))
if res.code =~ /2|3\d{2}/
return true
else
return false
end
rescue Timeout::Error
if retrycount < 4
retrycount += 1
sleep 3
retry
else
return false
end
rescue
return false
end
end

image science requirement

2009-04-03T07:44:00.000-07:00

.ruby_inline/Inline_ImageScience_aa58.c:2:23: error: FreeImage.h: No such file or directory

getting such an error??
just install freeimage,


http://www.urbanpuddle.com/articles/2008/01/22/install-freeimage-imagescience-on-ubuntu-gutsy#comments

the above link will guide u in installing..
thanks,

E- Books..

2009-03-10T01:34:00.000-07:00

hi,
I have more than 200 E-Books, in all Programming languages.
If any one need it, mail me in sri.jjhero@gmail.com

calling JS from form in rails

2009-03-03T20:40:00.000-08:00

<%= form_tag({:action=>"report"},{:method => :post, :onSubmit => "return isNumeric(document.getElementById('premium_user'))"})%>

CSV

2009-03-01T06:36:00.000-08:00

hi,
any work under csv??
here s something interesting which makes ur csv work easier.

http://fastercsv.rubyforge.org/

Thanks.

concat multiple arrays

2009-02-24T21:41:00.001-08:00

hi,
joining multiple arrays is easy using "+"

we can do that using a single method as follows,

class Array
  def concat_multi *lists
    lists.each {|list| self.concat(list) }
  end
end

a = [1, 2, 3]
b = [4, 5, 6]
c = [7, 8, 9]
d = [10, 11]

a.concat_multi(b, c, d)
p a

Convert a String into Time

2009-02-19T04:48:00.000-08:00

require'rubygems'
=> true
require'time'
=> true

a="Thu Feb 19 18:16:33 +0530 2009"
=> "Thu Feb 19 18:16:33 +0530 2009"
a=Time.parse(a)
=> Thu Feb 19 18:16:33 +0530 2009

a.day
=> 19
a.year
=> 2009
a.month
=> 2
a.hour
=> 18
a.min
=> 16
a.sec
=> 33

thanks..

Weekday or not

2009-02-16T00:42:00.000-08:00

hi,
wanna find whether a day is week day or not??

i have tried tht here. ,

date=date.today

[0,6].include?(date.wday)

------------------------------------------------------------------------

  require 'date'

class Date
  def weekend?
    self.wday == 0 || self.wday == 6
  end
end

d1 = "9 December 2008"
d2 = "13 December 2008"

p Date.parse(d1).weekend? # false
p Date.parse(d2).weekend? # true

------------------------------------------------------------------------

I have used the code for calculation of weekdays between 2 dates.,

require 'date'
d1 = Date.new( 2008, 11, 1 )
d2 = Date.new( 2008, 12, 31 )

WEEKDAY_NUMBERS = [1,2,3,4,5]
weekdays = (d1..d2).select{ |d| WEEKDAY_NUMBERS.include?( d.wday ) }
p weekdays.length

----------------------------------------------------

Displaying Rss in rails

2009-02-13T04:03:00.000-08:00

hi,
i have displayed an array as rss feeds, using rails..

here s the code..
In the controller,

h={}
h[:summary] =summary
h[:description]=description
h[:dtstart]=dtstart.to_s
h[:url]=url
@arr << h

render :layout =>false
response.headers["Content-Type"]= "application/xml; charset=utf-8"

In the View file., Filename is , *.rxml

xml.instruct!
xml.rss "version" => "2.0", "xmlns:dc" => "http://purl.org/dc/elements/1.1/" do
xml.channel do |feed|
feed.title("My great blog!")
feed.description("description")
feed.link("ur url link")

@arr.each { |p|
feed.item do |item|
item.title p[:summary]
item.description p[:description]
item.link p[:url]
item.pubdate p[:dtstart]
end
}
end
end

now it is displayed as xml feed in the view file..
Thanks .

ICAL - specifications

2009-02-11T20:53:00.000-08:00

hi,
here is the ical specifications listed by wiki..

http://upload.wikimedia.org/wikipedia/en/c/c0/ICalendarSpecification.png

Thanks.

ICAL-RSS convertion using vpim gem

2009-02-10T21:30:00.000-08:00

hi,
i have done the same rss to ical ,vise-versa using vpim gem..

here is the gem home..
http://vpim.rubyforge.org/

This is my code..
require 'rubygems'
require 'vpim/icalendar'
require'feed_tools'
require'digest/md5'

feed = FeedTools::Feed.open("http://rss.cnn.com/rss/edition_world.rss")
cal = Vpim::Icalendar.create2
feed.items.each do |item|
cal.add_event do |e|
e.dtstart item.time
e.dtend item.time
e.summary item.title.to_s
e.description item.description.to_s
e.url item.link
e.uid Digest::MD5.hexdigest("#{item.title} #{item.link}")
e.access_class "PUBLIC"
e.transparency 'OPAQUE'
now = Time.now
e.created now
e.lastmod now
e.organizer do |o|
o.cn = "Example Organizer, Mr."
o.uri = "mailto:organizer@example.com"
end
end
end
icsfile = cal.encode
f=File.open('2.ics','w')
f.write(icsfile)
puts '--- Encode:'

puts icsfile

puts '--- Decode:'

cal = Vpim::Icalendar.decode(icsfile).first

cal.components do |e|
puts e.summary
puts e.description
puts e.dtstart.to_s
puts e.dtend.to_s
puts e.url
end

Ical to Rss Converter

2009-02-09T01:15:00.000-08:00

hi,
first execute the rss to ical converter, store it in a file, then use this script, to convert it into rss.

require 'rubygems'
require 'net/http'
require 'uri'
require 'time'

class Time
def self.gcalschema(tzid) # We may not be handling Time Zones in the best way...
tzid =~ /(\d\d\d\d)(\d\d)(\d\d)T(\d\d)(\d\d)(\d\d)Z/ ? # yyyymmddThhmmss
Time.xmlschema("#{$1}-#{$2}-#{$3}T#{$4}:#{$5}:#{$6}") :
nil
end
end

class ICal

attr_accessor :hash, :raw
def initialize(ical_data)
self.raw = ical_data
self.hash = self.parse_ical_data(self.raw)
end

def parse_ical_data(data)
data.gsub!(/\\\n/, "\\n")
data.gsub!(/[\n\r]+ /, "\\n")
lines = data.split(/[\n\r]+/)
structure = [{}]
keys_path = []
last_is_array = false
lines.each do |line|
line.gsub!(/\\n/, "\n")
pair = line.split(':')
name = pair.shift
value = pair.join(':')
case name
when 'BEGIN' #Begin Section
if structure[-1].has_key?(value)
if structure[-1][value].is_a?(Array)
structure[-1][value].push({})
last_is_array = true
else
structure[-1][value] = [structure[-1][value], {}]
last_is_array = true
end
else
structure[-1][value] = {}
end
keys_path.push(value)
structure.push({})
when 'END' #End Section
if last_is_array
structure[-2][keys_path.pop][-1] = structure.pop
last_is_array = false
else
structure[-2][keys_path.pop] = structure.pop
end
else #Within last Section
structure[-1][name] = value
end
end
structure[0]
end
end

class Parse
attr_accessor :url, :ical, :xml, :product_id, :version, :scale, :method, :time_zone_name, :time_zone_offset, :events
def parse_from_ical
rawdata = self.calendar_raw_data
return nil unless rawdata
self.ical = ICal.new(rawdata)
self.version = self.ical.hash['VCALENDAR']['VERSION']
self.scale = self.ical.hash['VCALENDAR']['CALSCALE']
self.method = self.ical.hash['VCALENDAR']['METHOD']
self.product_id = self.ical.hash['VCALENDAR']['PRODID']
self.ical.hash['VCALENDAR']['VEVENT'] = [self.ical.hash['VCALENDAR']['VEVENT']] unless self.ical.hash['VCALENDAR']['VEVENT'].is_a?(Array)
self.ical.hash['VCALENDAR']['VEVENT'].each do |e|
if !e.nil?
st = e['DTSTART']
et = e['DTEND']
#et = (Time.gcalschema("#{e["DTEND;TZID=#{self.time_zone_name}"] || "#{e['DTEND;VALUE=DATE']}T000000"}Z") || Time.gcalschema(e['DTEND'])) + tzadjust
# DTSTART;TZID=America/New_York:20070508T070000
@xtr=self.add_event(Event.new(
:start_time => st,
:end_time => et,
:location => e['LOCATION'],
:created_at => Time.gcalschema(e['CREATED']),
:updated_at => Time.gcalschema(e['LAST-MODIFIED']),
:summary => e['SUMMARY'],
:description => e['DESCRIPTION'],
:recurrance_rule => e['RRULE']
), false) # (disable sorting until done)
@events.reject! {|e| e.start_time.nil?}
@events.sort! {|a,b| a.start_time <=> b.start_time }
puts @xtr
end
end
end

def calendar_raw_data
f=File.open("rss2ical.ics","r")
a=f.readlines
return a.to_s
end

def add_event(event, sortit=true)
self.events = [] unless self.events.is_a?(Array)
self.events << event
@events.sort! {|a,b| a.start_time <=> b.start_time } if sortit
event
end
end

class Event
attr_accessor :start_time, :end_time, :location, :created_at, :updated_at, :summary, :description, :recurrance_rule
def initialize(attributes={})
attributes.each do |key, value|
self.send("#{key.to_s}=", value)
end
end
end

a=Parse.new
a.parse_from_ical

RSS to Ical Converter

2009-02-07T01:56:00.000-08:00

hi,
this program gets the rss feed using the feed_tools gem.
then converts into ical. then i ve written it in a file.
hope it will be useful.

require'rubygems'
require'feed_tools'
require'digest/md5'
require 'icalendar'
require 'date'

feed = FeedTools::Feed.open("http://timesofindia.indiatimes.com/rssfeeds/-2128932452.cms")
cal = Icalendar::Calendar.new
cal.custom_property("METHOD","PUBLISH")
feed.items.each do |item|
event = Icalendar::Event.new
event.url=item.link
event.uid=Digest::MD5.hexdigest("#{item.title} #{item.link}")
event.dtstart = item.time.strftime("%Y%m%dT%H%M%S")
event.dtend = item.time.strftime("%Y%m%dT%H%M%S")
event.summary = item.title.to_s
event.description = item.description.to_s
event.klass = "PUBLIC"
cal.add_event(event)
end
ical= cal.to_ical
f=File.open("rss2ical.ics","w")
f.write(ical)

puts ical.to_html

google page rank gem

2009-01-22T04:12:00.000-08:00

hi..
Ruby has this gem, to find google page rank of a site......,
just install the gem.

>>> sudo gem install googlepagerank

>>>

example program:

require "rubygems"
require "googlepagerank"

puts GooglePageRank.get("www.yahoo.com")
=> 9

u can check the above in the site, for further info.
http://googlepagerank.rubyforge.org/
thanks..

hello

2008-06-29T21:47:00.000-07:00

hi guys,.

Srikanth Jeeva's Ruby Blog

Caching in Rails

Roles implemented with easy_roles plugin

How to fix Unrecognized command line argument: 'package'

How to fix 'make' is not recognized as an internal or external command

Rhodes + Blackberry + Fixing error + No such file or directory Simulator

Installing Rhodes, Running app in Blackberry Simulator in windows

Rhodes + Setup Android in windows + problems

Fix : run this in terminal. this will set up the rhodes path

$ set-rhodes-sdkc:/InstantRhodes/ruby/lib/ruby/gems/1.8/gems/rhodes-3.0.2/bin

Rails - Calendar date select in 3 simple steps

RubyConfIndia - May 28, 29 - 2011

Rails 3 - rake aborted! undefined method `task' for #

Helper method to display number in money format - number_with_delimiter

Will Paginate - Array Pagination

Ruby Sorting Manually by created at

Rails + Google Map V3 with Marker, Bounds

Rails - Active Record - Save without callbacks

Exporting as CSV file in RAILS.

Jquery Checkbox on click - enable/disable Items

cartographer - Google map API v3 plugin in rails

Refresh Page with Javascript

Registering your App in Facebook

A super simple Facebook Open Graph API client

Authentication with Facebook, Twitter, etc

Rails Calendar date select without Image

MiniMagick - undefined method `output'

jQuery UI datepicker in Rails

Design your Site with Jquery UI

Will Paginate Ajax pagination

Will paginate pagination style

Send Ajax request after Auto Complete text box - after_update_element

Auto Complete Text Box in Rails

HTML stripping, Truncating string in Ruby, Rails

Weekday or not..

Rails find_by_sql returns object ??

Installing pauldix-feedzirra

Problems in Installing Curb in ubuntu

Sending HTML mail in rails

select box Send Id, display name..

Image submit tag without border

You are being redirected

Auto Login in rails

FaceBook Javascript SDK Like button examples

using map with html images

Making a http/https post request

Make ll command working in linux

Checking requirements in Routes

sending ajax request in rails

sending ajax request in rails

Find Number of mp3 files in a directory

Thinking sphinx

Add a text to text box, hide when it is clicked, show when clicked out

Embed Flash - swf file in website

ruby conference - India, Bangalore 2010

File Extension

select class not applied

Getting a DB dump in local machine from server

You’re in the middle of a conflicted merge (git)

Generate random texts

'Include' in rails query

Select Helper Methods in Rails

undefined method `relative_url_root' error

Github get Public Key, set user name

Multiple Language implementation Using Google Translate

Multiple Select boxes in Js

Add Favicon in a webpage

Adding GEM sources

Action Web Service Gem

Generating API controller

Define your API

API implementation

Getting Next Existing Record in a DB

Table Sorting Jquery Plugin

MySQL Change root Password

mysqladmin command to change root password

Change MySQL password for other user

Changing MySQL root user password using MySQL sql command

Polymorphic Association

string conversions

$ set-rhodes-sdk
c:/InstantRhodes/ruby/lib/ruby/gems/1.8/gems/rhodes-3.0.2/bin