Tuesday, November 17, 2009
Adding GEM sources
sudo gem sources -a http://gems.rubyonrails.org/
Action Web Service Gem
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
Tuesday, November 10, 2009
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
Thursday, September 24, 2009
Table Sorting Jquery Plugin
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
Monday, September 14, 2009
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;Thanks,
mysql> quit
Recover Mysql Password
http://www.cyberciti.biz/tips/recover-mysql-root-password.html
Srikanth
Sunday, September 6, 2009
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
endNow, 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
Monday, August 17, 2009
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

