Registration for Events

app/models/events_registration.rb

@@ -1,4 +1,12 @@
 class EventsRegistration < ActiveRecord::Base
   belongs_to :registration
   belongs_to :event
+
+  has_one :user, through: :registration
+
+  delegate :name, to: :registration
+  delegate :email, to: :registration
+
+  validates :event, :registration, presence: true
+  validates :event, uniqueness: { scope: :registration }
 end