subscription.rb 279 Bytes EditWeb IDE 1 2 3 4 5 6 7 8 9 class Subscription < ActiveRecord::Base belongs_to :user belongs_to :project belongs_to :subscribable, polymorphic: true validates :user, :subscribable, presence: true validates :project_id, uniqueness: { scope: [:subscribable_id, :subscribable_type, :user_id] } end