Beena Shetty: Controller

1.To call Applicationcontroller methods from the Console


    ApplicationController.new.methods
    => :hello, :current_user, :create_support_user

It will display all the methods of application controller


    ApplicationController.new.hello
    => "Hello World"

Here :hello is the method defined inside application_controller.

Note: Instead of using ApplicationController.new you can also use controller.methods
Check this link for more details related to controller

2. To use Helper methods from the Console

 
    ApplicationController.helpers.methods
    => :admin?, :client?   
     OR
    helper.methods
    => :admin?, :client?

It will display all the helper methods

   
    helper.number_to_currency(100)
    => "$100.00"
    helper.truncate("Testing User", length: 2)
    => "Testing Use..."
    helper.pluralize(2, "Person")
    => "2 People"

3. Who defined helper?

    
    helper.method(:truncate)
    => #<Method: ActionView::Base(ActionView::Helpers::TextHelper)#truncate> 
    helper.method(:link_to)
    => #<Method: ActionView::Base(ActionView::Helpers::UrlHelper)#link_to> 
    helper.method(:number_to_currency)
    => #<Method: ActionView::Base(ActionView::Helpers::NumberHelper)#number_to_currency

4. app

    
    app.class
    => ActionDispatch::Integration::Session

i. Routes

  
    app.overview_admin_index_path()
    => "/admin/overview"   
    app.edit_user_registration_path(User.first)
    =>/users/edit.12"

ii. Url


    app.url_for(:controller => :admin)
    => "http://www.example.com/admin" 
    app.url_for(:controller => :admin, :action => :overview)
    => "http://www.example.com/admin/overview"

iii. Submit request
To make request from console


   app.get "/users/sign_in"
   => 200

   app.session
   => {"session_id"=>"786731e9880c620cf638b57a4db88a1e", "user_return_to"=>"/admin/overview", "flash"=>#, @closed=false, @flashes={:alert=>"You need to sign in or sign up before continuing."}, @now=nil>, "_csrf_token"=>"kvMbabanAsi07gEfsuzHdR7xnCEz0hMIvRBU2LiaqFs="} 
 
   app.get "/users/sign_in",{:username => 'new_user', :password => '123456789'}
   => 200

   app.cookies
   => #<Rack::Test::CookieJar:0xbf005a4 @default_host="www.example.com", @cookies=[#<Rack::Test::Cookie:0xba68e24 @default_host="www.example.com", @name_value_raw="_snipper_host_india_session=BAh7CEkiD3Nlc3Npb25faWQGOgZFRkkiJTc4NjczMWU5ODgwYzYyMGNmNjM4YjU3YTRkYjg4YTFlBjsAVEkiE3VzZXJfcmV0dXJuX3RvBjsARkkiFC9hZG1pbi9vdmVydmlldwY7AEZJIhBfY3NyZl90b2tlbgY7AEZJIjFrdk1iYWJhbkFzaTA3Z0Vmc3V6SGRSN3huQ0V6MGhNSXZSQlUyTGlhcUZzPQY7AEY%3D--152f06b94ca610d662cfd7148b7a4a49ceac23eb", @name="_snipper_host_india_session", @value="BAh7CEkiD3Nlc3Npb25faWQGOgZFRkkiJTc4NjczMWU5ODgwYzYyMGNmNjM4YjU3YTRkYjg4YTFlBjsAVEkiE3VzZXJfcmV0dXJuX3RvBjsARkkiFC9hZG1pbi9vdmVydmlldwY7AEZJIhBfY3NyZl90b2tlbgY7AEZJIjFrdk1iYWJhbkFzaTA3Z0Vmc3V6SGRSN3huQ0V6MGhNSXZSQlUyTGlhcUZzPQY7AEY=--152f06b94ca610d662cfd7148b7a4a49ceac23eb", @options={"path"=>"/", "HttpOnly"=>nil, "domain"=>"www.example.com"}>]>

iv. Response


   app.response
     It will display full html code

   app.response.response_code
   => 200

   app.response.body[0..100]
   => "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml"

   app.path
   => "/users/sign_in"

4. Method location

To get exact source loaction of particular method using Method#source_location


    User.instance_method(:role?).source_location
    =>["/home/Desktop/Workspace/host_india/app/models/user.rb", 32]

Let's try for app


    app.method(:post).source_location
    => ["/home/gvo/.rvm/gems/ruby-1.9.2-p318/gems/actionpack-3.2.6/lib/action_dispatch/testing/integration.rb", 38]

5. Accessing the last return value


   "Hello"
   => "Hello" 
   str = _
   => "Hello" 
   str
   => "Hello" 

   Commission.first
   => #
   _.amount
   => 4947.3

Get collection of models inside your application.

1. Get table names inside database


  ActiveRecord::Base.connection.tables.map do |model|
    model.capitalize.singularize.camelize
  end

  =>["Blog", "User", "UserDetail"]

2. Load models dir


  @models = Dir['app/models/*.rb'].map {|f| File.basename(f, '.*').camelize.constantize.name }

3. ActiveRecord subclasses
It will only get base class models not inherited models.


# make sure that  relevant models are loaded otherwise
# require them prior
# Dir.glob('#{RAILS_ROOT}/app/models/*.rb').each { |file| require file }
   class A < ActiveRecord::Base
   end

   class B < A
   end

   class C < B
   end

  ActiveRecord::Base.subclasses.each{|x| x.name }

  =>["A"]

4. Inherited model
It will get both base class models and inherited models using descendants.


# make sure that  relevant models are loaded otherwise
# require them prior
# Dir.glob('#{RAILS_ROOT}/app/models/*.rb').each { |file| require file }
   class A < ActiveRecord::Base
   end

   class B < A
   end

   class C < B
   end

  ActiveRecord::Base.descendants.each{|x| x.name }

  =>["A", "B", "C"]

Get collection of controllers inside your application.

1. ApplicationController subclasses
It will get all controller classes.


  ApplicationController.subclasses

  =>["AccountsController", "BlogsController", "UsersController"]

2. Inherited Controller
It is get all controller classes along with inherited controller classes.


  class AccountsController < ApplicationController
  end

  class ArticlesController < ::AccountsController
  end

  ApplicationController.descendants

  =>["AccountsController", "BlogsController", "UsersController", "AccountsController", "ArticlesController"]

Note:
require all files in "#{RAILS_ROOT}/app/controllers" to populate your list in development mode.
It'll get you started, but keep in mind that in development mode you won't see much, because it will only show you what's actually been loaded. Fire it up in production mode, and you should see a list of all of your controllers.

To get all the actions in a controller, use action_methods


  PostsController.action_methods

Beena Shetty

Wednesday, 3 October 2012

Rails Console Tips