Ruby on Rails (notes for observers)

OBSERVERS

lib/inventory_init.rb
   ActiveRecord::Base.observers = [:item_observer,
 :item_supplier_observer]


config/environment.rb
   require 'inventory.init'
   config. load_path += %W(#RAILS_ROOT/app/observers)


class ItemObserver < ActiveRecord::Observer
   def before_create(record)
       #code here
   end
   def after_create(record)
       #code here
   end
end

def before_update(record)
   @status = record.status
end

def after_update(record)
   if  @status == record.status
       # Your code here.
   end
end

Ruby on Rails Find or Create

sample Code:
row = Category.find_or_create_by_name("General")
row = ItemSupplier.find_or_create_by_suplier_id(1,2)

Creating projects in rails

Create Project:

• rails <project name>

Run the server:

• mongrel_rails start -p <port> -d

Migrate:

• rake migrate
  
• rake migrate VERSION=<version number>
  

Generate scripts:

• ruby script/generate model <model name>
• ruby script/generate controller <controller name>
• ruby script/generate migration <migration name>
• ruby script/generate plugin <plugin name>

How To Install Ruby On Rails In Windows

$ gem install rails --include-dependencies
$ gem install win32-service
$ gem install mongrel
$ gem install mongrel_service

Sample Codes in phptarsier Ajax

Ajax::remote_form
Ajax::remote_anchor

<div id="placeholder"> </div>

<?= Ajax::remote_anchor('Fill in the Blanks',
     array(t_action => 'ajax_fill'),
     array(
       'update' => 'placeholder',
       'success' => Html::effects:highlight
     )
) ?>