Uninitialized constant error in controller when deploy to heroku

I try to set up devise and omniauth by follow https://github.com/plataform开发者_Go百科atec/devise/wiki/OmniAuth:-Overview and deploy to heroku. There is no error in localhost , but when I push to heroku , the app crash. In heroku logs , i found the 'uninitialized constant Users' error in omniauth_callbacks_controller.rb . How do I initialize the Users? I have heroku rake db:migrate already. But I cant run heroku console because app crash , so i cant check is there a User model. For your information , I generate the controller by rails g omniauth_callbacks_controller

In heroku logs

/disk1/home/slugs/338566_ad6243a_bbb1-19eae435-d901-44ba-9dd5-baf36d656448/mnt/app/controllers/omniauth_callbacks_controller.rb:1: uninitialized constant Users (NameError)

In omniauth_callbacks_controller.rb

class Users::OmniauthCallbacksController < Devise::OmniauthCallbacksController
  def facebook
    @user = User.find_for_facebook_oauth(env["omniauth.auth"], current_user)

    if @user.persisted?
      flash[:notice] = I18n.t "devise.omniauth_callbacks.success", :kind => "Facebook"
      sign_in_and_redirect @user, :event => :authentication
    else
      session["devise.facebook_data"] = env["omniauth.auth"]
      redirect_to new_user_registration_url
    end
  end
end

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Are you sure the User model has been created in Heroku's database?

In your terminal (NOT the rails console!) enter

heroku rake db:migrate

That will migrate Heroku's DB's to match your code. Do you then still have the error?

---

Heroku needs to migrate with model, so you need to run

heroku rake db:migrate

then refresh your page, now its working :)