CODEWITHSUNDEEP
ruby-on-railspolymorphic-associations
Flo Rahl
Flo Rahl

Reputation: 1054

Is it possible to inverse polymorphic association?

I have four models : User, Product, Ownership, and Location. Product belongs to User through Ownership and User has many Products through Ownership. When a User create a Product, I want that if the User has a Location, the Product is linked to the same Location. So here is my question :

Can we transform this : 

class Location < ActiveRecord::Base
  belongs_to :localizable, polymorphic: true
end

class User < ActiveRecord::Base
  has_one :location, as: :localizable
end

class Product < ActiveRecord::Base
  has_one :location, as: :localizable
end

into this :

class Location < ActiveRecord::Base
  has_many :localizables, polymorphic: true
end

class User < ActiveRecord::Base
  belongs_to :location, as: :localizable
end

class Product < ActiveRecord::Base
  belongs_to :location, as: :localizable
end

Upvotes: 1

Views: 1161

Answers (1)

zwippie
zwippie

Reputation: 15515

How about delegating product.location to product.owner.location.

This can be done in the Product class as follows (change identifier for the owner/user relation as needed):

class Product < ActiveRecord::Base
  delegate :location, to: :owner
end

If you call product.location, the location of the owner will be returned.

Upvotes: 1

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