Adding GEM sources

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

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

Action Web Service Gem

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 < ApplicationController
wsdl_service_name 'Post'
web_service_api PostApi
web_service_scaffold :invocation if Rails.env == 'development'

def get_posts
["Post 1", "Post 2"]
end
end

wsdl url:


http://localhost:3000/post/wsdl

Getting Next Existing Record in a DB

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

sql:

SELECT * FROM foo WHERE id = 4 OFFSET 1

Table Sorting Jquery Plugin

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

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

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

>>> 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