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  • Rails Command Line Tools

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    Rails is a language particularly known for its rapid development and shortcut commands that make development of applications and its modules fast and easy. Today I am going to tell you about few most basic commands of rails:

    1. rails new:

    This command is the first command for rails that is used for creating applications in Ruby on Rails. Once you hit this command it creates a full fledged rails application with full structured rails app.

    rails new sample_app

    It will give output like:

    
          $ rails new sample_app
         create
         create  README.rdoc
         create  Rakefile
         create  config.ru
         create  .gitignore
         create  Gemfile
         create  app
         ...
         create  tmp/cache
         ...
            run  bundle install

    2. rails server:

    This command starts the WEBrick server that starts the application. By default it runs the application on port number 3000 in development mode. you can change the port number and mode by providing it with -p [For port number] and -e [For environment]. The syntax for this is

    rails server

    It will give output like:

     => Booting WEBrick
     => Rails 4.2.5.2 application starting in development on http://localhost:3000
     => Run `rails server -h` for more startup options
     => Ctrl-C to shutdown server
     [2016-06-02 15:21:21] INFO  WEBrick 1.3.1
     [2016-06-02 15:21:21] INFO  ruby 2.2.1 (2015-02-26) [x86_64-linux]
     [2016-06-02 15:21:21] INFO  WEBrick::HTTPServer#start: pid=8143 port=3000

     

    ## For running app with port number and environment you can run this command like:
    
    rails server -p PORT_NUMBER -e ENVIRONMENT
    

    3. rails generate:

    This is the command that acts as a generator for creating different types of files in Ruby on Rails application like Models, Controllers etc.

    Syntax:
    
    rails generate GENERATOR [args] [options]

    To generate a model use the following:

    rails generate model ModelName column:datatype column:datatype [...]

     

     $ rails g model User name:string email:string
    Running via Spring preloader in process 10196
          invoke  active_record
          create    db/migrate/20160602115029_create_users.rb
          create    app/models/user.rb
          invoke    test_unit
          create      test/models/user_test.rb
          create      test/fixtures/users.yml
    

    To generate a scaffold use the following:

     rails generate scaffold ModelName column:datatype column:datatype [...]

     

    $ rails generate scaffold User name:string email:string
    Running via Spring preloader in process 10160
          invoke  active_record
          create    db/migrate/20160602114830_create_users.rb
          create    app/models/user.rb
          invoke    test_unit
          create      test/models/user_test.rb
          create      test/fixtures/users.yml
          invoke  resource_route
           route    resources :users
          invoke  scaffold_controller
          create    app/controllers/users_controller.rb
          invoke    erb
          create      app/views/users
          create      app/views/users/index.html.erb
          create      app/views/users/edit.html.erb
          create      app/views/users/show.html.erb
          create      app/views/users/new.html.erb
          create      app/views/users/_form.html.erb
          invoke    test_unit
          create      test/controllers/users_controller_test.rb
          invoke    helper
          create      app/helpers/users_helper.rb
          invoke      test_unit
          invoke    jbuilder
          create      app/views/users/index.json.jbuilder
          create      app/views/users/show.json.jbuilder
          invoke  assets
          invoke    coffee
          create      app/assets/javascripts/users.coffee
          invoke    scss
          create      app/assets/stylesheets/users.scss
          invoke  scss
          create    app/assets/stylesheets/scaffolds.scss
    

    To generate a controller use the following:

    rails generate controller ControllerName [actions]
    
    $ rails g controller users
    Running via Spring preloader in process 10237
          create  app/controllers/users_controller.rb
          invoke  erb
          create    app/views/users
          invoke  test_unit
          create    test/controllers/users_controller_test.rb
          invoke  helper
          create    app/helpers/users_helper.rb
          invoke    test_unit
          invoke  assets
          invoke    coffee
          create      app/assets/javascripts/users.coffee
          invoke    scss
          create      app/assets/stylesheets/users.scss
    

    4. rails console:

    This command lets you interact with the application and its database through console. It is very helpful in debugging the application. Application methods can also be called from this console.

     $ rails c
     Running via Spring preloader in process 10313
     Loading development environment (Rails 4.2.5.1)
     2.2.1 :001 > 

     

    5. rails destroy:
    This command is used for destroying the things already generated using rails command like if you have generated model User using rails g then you can remove it using rails d.

     $ rails g model User 
    Running via Spring preloader in process 10509
          invoke  active_record
          create    db/migrate/20160602121026_create_users.rb
          create    app/models/user.rb
          invoke    test_unit
          create      test/models/user_test.rb
          create      test/fixtures/users.yml
    
     $ rails d model User 
    Running via Spring preloader in process 10529
          invoke  active_record
          remove    db/migrate/20160602121026_create_users.rb
          remove    app/models/user.rb
          invoke    test_unit
          remove      test/models/user_test.rb
          remove      test/fixtures/users.yml
    

    Hope you enjoyed reading this. Will talk about some more command line features of rails soon.

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