doorkeeper_models.rb

require_relative 'doorkeeper'

Rails.application.config.to_prepare do
  Doorkeeper::Application.class_exec do

    has_many :application_users, foreign_key: :application_id,
                                 dependent: :destroy,
                                 inverse_of: :application
    has_many :users, through: :application_users

    has_many :application_groups, foreign_key: :application_id,
                                  dependent: :destroy,
                                  inverse_of: :application
    has_many :groups, through: :application_groups

    has_many :messages, inverse_of: :application

    has_many :security_logs, inverse_of: :application

    def is_redirect_url?(url)
      return false if url.nil?

      # Let doorkeeper do the work of checking the URL against the app's redirect_uris
      Doorkeeper::OAuth::Helpers::URIChecker.valid_for_authorization?(url, redirect_uri)
    end

  end

  Doorkeeper::AccessToken.class_exec do
    before_create :create_application_user

    def create_application_user
      return unless application_id && resource_owner_id
      FindOrCreateApplicationUser.call(application_id, resource_owner_id)
    end
  end

  Doorkeeper::TokensController.class_exec do
    alias_method :original_create, :create # before_action not available
    def create
      original_create
    end
  end
end