Are controllers in devise automatically generated? How do you access them?

I know for views you do rails generate devise_vie开发者_开发百科ws.

Under the assumption that you want to see these controllers in order to modify or override them, Devise now provides a simple generator which recreates their controllers in your app to make this easy. As per the documentation (which will be most up-to-date):

1) Create your custom controllers using the generator which requires a scope:

console

rails generate devise:controllers [scope]

If you specify users as the scope, controllers will be created in app/controllers/users/. And the sessions controller will look like this:

class Users::SessionsController < Devise::SessionsController
  # GET /resource/sign_in
  # def new
  #   super
  # end
  ...
end

2) Tell the router to use this controller:

devise_for :users, controllers: { sessions: "users/sessions" }

3) Copy the views from devise/sessions to users/sessions. Since the controller was changed, it won't use the default views located in devise/sessions.

4) Finally, change or extend the desired controller actions.

You can completely override a controller action:

class Users::SessionsController < Devise::SessionsController
  def create
    # custom sign-in code
  end
end

Or you can simply add new behaviour to it:

class Users::SessionsController < Devise::SessionsController
  def create
    super do |resource|
      BackgroundWorker.trigger(resource)
    end
  end
end

This is useful for triggering background jobs or logging events during certain actions.

Remember that Devise uses flash messages to let users know if sign in was successful or unsuccessful. Devise expects your application to call flash[:notice] and flash[:alert] as appropriate. Do not print the entire flash hash, print only specific keys. In some circumstances, Devise adds a :timedout key to the flash hash, which is not meant for display. Remove this key from the hash if you intend to print the entire hash.

Devise uses internal controllers, which you can access and subclass in your own code. They are under the Devise module. For example, to extend the RegistrationsController:

class MembershipsController < Devise::RegistrationsController
  # ...
end

Then all you have to do is configure Devise's routes to use your controller instead:

devise_for :members, :controllers => { :registrations => 'memberships' }

$ rails generate devise:controllers SCOPE [options]

Options: -c, [--controllers=one two three]

Select specific controllers to generate (confirmations, passwords, registrations, sessions, unlocks, omniauth_callbacks)

Use -c to specify which controller you want to overwrite. If you do not specify a controller, all devise controllers will be created. For example:

rails generate devise:controllers users -c=sessions

This will create a controller class at app/controllers/users/sessions_controller.rb like this:

 class Users::ConfirmationsController < Devise::ConfirmationsController
    content...
 end

Below one is for Rails 5

Generate rails devise controllers using the following command:

rails generate devise:controllers users

if you modified the above generated controllers, add the following line to the routes.rb,

devise_for :users, controllers: {registrations:'user/registrations'}

Your modifications will take effect once you restart the rails server

To define custom controller behavior,

see @ErikTrautman's answer.

But if you're trying to understand what Devise is doing under the hood,

you must inspect the source (specifically, in the project root's app/ directory). @MatheusMoreira provides a link to the source on GitHub, but if you'd rather browse it locally in your own text editor, you can find the install location of the Devise gem with gem which devise.

For instance, to see Devise::SessionsController:

$ vim $(gem which devise | sed 's|\(.*\)\(/.*\)\{2\}|\1|')/app/controllers/devise/sessions_controller.rb

(Or, you could just clone the git repo and poke around that way.)

$ git clone https://github.com/plataformatec/devise
$ cd devise
$ vim app/controllers/devise/sessions_controller.rb