ruby on rails - Devise Invitable - Restricting Access to Only invited users -

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i might searching wrong key words, can't find way restrict users invited allowed create account on rails site (or maybe i'm using devise-invitable wrong). assume, there should method call in before filter or flip switch on initializer/devise.rb

i tried in users_controller.rb , had no luck using ruby doc reference 

before_filter: invited?

i have read initializers/devise.rb , readme , didn't have luck.

i think should make custom filter purpose.

before_action :authenticate_user!  before_filter :restrict_only_invited_users  def restrict_only_invited_users   redirect_to :root if current_user.invitation_accepted_at.blank? end

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