Nonoptimal many-to-many associations

#Nonoptimal many-to-many associations

#app/models/train.rb

class Train < ActiveRecord::Base
  has_many :train_locations, dependent: :destroy
  has_many :locations, through: :train_locations
end

#app/models/train_location.rb

class TrainLocation < ActiveRecord::Base
  belongs_to :train
  belongs_to :location
end

#app/models/copter.rb

class Copter < ActiveRecord::Base
  has_many :copter_locations, dependent: :destroy
  has_many :locations, through: :copter_locations
end

#app/models/copter_location.rb

class CopterLocation < ActiveRecord::Base
  belongs_to :copter
  belongs_to :location
end

#app/models/truck.rb

class Truck < ActiveRecord::Base
  has_many :truck_locations, dependent: :destroy
  has_many :locations, through: :truck_locations
end

#app/models/truck_location.rb

class TruckLocation < ActiveRecord::Base
  belongs_to :truck
  belongs_to :location
end

#app/models/ship.rb

class Ship < ActiveRecord::Base
  has_many :ship_locations, dependent: :destroy
  has_many :locations, through: :ship_locations
end

#app/models/ship_location.rb

class ShipLocation < ActiveRecord::Base
  belongs_to :ship
  belongs_to :location
end

#app/models/location.rb

class Location < ActiveRecord::Base
  has_many :train_locations, dependent: :destroy
  has_many :copter_locations, dependent: :destroy
  has_many :truck_locations, dependent: :destroy
  has_many :ship_locations, dependent: :destroy

  has_many :trains, :through => :train_locations
  has_many :copters, :through => :copter_locations
  has_many :trucks, :through => :truck_locations
  has_many :ships, :through => :ship_locations
end