ruby on rails - Unknown action The action 'linkedin' could not be found for Devise::OmniauthCallbacksController -

i'm trying implement open authorization within rails app users can log in linkedin accounts. when click on link go linkedin authorization page, , confirm linkedin credentials, error within app:

unknown action  action 'linkedin' not found devise::omniauthcallbackscontroller 

i'm positive issues lies within routes file. many tutorials call following line added:

devise_for :users, :controllers => { :omniauth_callbacks => "omniauth_callbacks" } 

however, have line here custom devise logins:

devise_for :users, :controllers => { :registrations => "registrations" }  

i tried switching them didn't work (as expected). there way combine 2 statements?

thanks!

issue omniauth_callbacks_controller: the action 'linkedin' not found omniauthcallbackscontroller

class omniauthcallbackscontroller < applicationcontroller     class omniauthcallbackscontroller < devise::omniauthcallbackscontroller    def linkedin     auth = env["omniauth.auth"]     @user = user.connect_to_linkedin(request.env["omniauth.auth"],current_user)     if @user.persisted?       flash[:notice] = i18n.t "devise.omniauth_callbacks.success"       sign_in_and_redirect @user, :event => :authentication     else       session["devise.linkedin_uid"] = request.env["omniauth.auth"]       redirect_to new_user_registration_url     end   end end end 

use

devise_for :users, :controllers => { :registrations => "registrations",  :omniauth_callbacks => "omniauth_callbacks"}  

this means customizing devise's registrationscontroller , omniauthcallbackscontroller.

for example:

class omniauthcallbackscontroller < devise::omniauthcallbackscontroller ... end 

and

class registrationscontroller < devise::registrationscontroller ... end