Create hotels.rb

hotels.rb

@@ -0,0 +1,47 @@
+#########################
+# in app/models/user.rb #
+#########################
+
+class User < ActiveRecord::Base
+  # If we don't put foreign_key: 'guest_id', then AR looks for user_id in the bookings table, which doesn't exist! yo
+  has_many :bookings, foreign_key: 'guest_id'
+  has_many :booked_rooms, through: :bookings, source: :room
+  # source: :room singular, because (1) AR error said so, (2) look at Booking model - says belongs_to :room singular, and we're using this association to obtain the rooms
+
+  has_many :booked_hotels, through: :booked_rooms, source: :hotel
+end
+
+############################
+# in app/models/booking.rb #
+############################
+
+class Booking < ActiveRecord::Base
+  # If we don't put class_name: 'User', then AR looks for a model called Guest which doesn't exist
+  belongs_to :guest, class_name: 'User'
+
+  belongs_to :room
+  has_one :hotel, through: :room
+
+  # Incorrect association to try to get booking.hotel to work:
+  # belongs_to :hotel, through: :room
+  # Reason: The belongs_to association CANNOT have the "through" option. However, "through" does work with the has_many association.
+end
+
+#########################
+# in app/models/room.rb #
+#########################
+
+class Room < ActiveRecord::Base
+  belongs_to :hotel
+  has_many :bookings
+end
+
+##########################
+# in app/models/hotel.rb #
+##########################
+
+class Hotel < ActiveRecord::Base
+  has_many :rooms
+  has_many :bookings, through: :rooms
+  has_many :booked_guests, through: :bookings, source: :guest
+end