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Create an alternate registration action in Devise

I have a working registration and login using Devise and Rails 4. However, I also created an invitation system in which existing users can invite others to join their organization. For this reason, I need a new page that contains both the registration and registration form, so when they click on their inviting link (which looks like / register_from_invitation / TOKEN_HERE), they will be able to register to accept the invitation, or if they already have an account, log in to accept.

So, on my routes, I:

devise_for :users, :controllers => {
  :sessions => "sessions",
  :registrations => "registrations",
  :confirmations => "confirmations",
  :passwords => "passwords"
}

devise_scope :user do
  get "register_from_invitation/:token", to: "registrations#new_from_invitation", as: "register_from_invitation"
  post "register_from_invitation/:token", to: "registrations#create_from_invitation", as: "create_registration_from_invitation"
  post "sign_in_from_invitation/:token", to: "sessions#create_from_invitation", as: "sign_in_from_invitation"
end

. "" new create, ( ) :

def new_from_invitation
  @invitation = Invitation.where(token: params[:token]).first
  build_resource({})
  self.resource.organisations << @invitation.organisation
  respond_with self.resource
end

def create_from_invitation
  @invitation = Invitation.where(token: params[:token]).first
  build_resource(sign_up_params)

  if resource.save
    resource.organisations << @invitation.organisation
    resource.roles[0].roles << @invitation.role.to_sym
    resource.roles[0].save
    @invitation.destroy
    SignupNotificationMailer.signup_notification_email(resource).deliver
    yield resource if block_given?
    if resource.active_for_authentication?
      set_flash_message :notice, :signed_up if is_flashing_format?
      sign_up(resource_name, resource)
      respond_with resource, :location => '/users/sign_up'
    else
      set_flash_message :notice, :"signed_up_but_#{resource.inactive_message}" if is_flashing_format?
      expire_data_after_sign_in!
      respond_with resource, :location => '/users/sign_up'
    end
  else
    clean_up_passwords resource
    respond_with resource
  end
end

, , URL (/register_from_invitation/TOKEN_HERE), new, respond_with resource :

respond_with resource, action: new_from_invitation

... , , , : Render and/or redirect were called multiple times in this action.

* _from_invitation? sign_in_from_invitation .

.

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response_with :

render "new_from_invitation"

.

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