CODEWITHSUNDEEP
ruby-on-railspolymorphic-associations
Mattia Lipreri
Mattia Lipreri

Reputation: 953

Double polymorphic associations

I have a double polymorphic associations, basically i'm going to put in relation Questions model and VideoInterview model with Bond model. They are made in this way:

bond migration

class CreateBonds < ActiveRecord::Migration
  def change
    create_table :bonds do |t|
      t.references :sourceable, :polymorphic => true
      t.references :targetable, :polymorphic => true
      t.string :operation
      t.string :score
      t.timestamps
    end
  end
end

bond.rb

class Bond < ActiveRecord::Base
  belongs_to :sourceable, :polymorphic => true
  belongs_to :targetable, :polymorphic => true
end

question.rb

class Question < ActiveRecord::Base
  has_many :bonds, :as => :sourceable
  has_many :bonds, :as => :targetable
end

video_interview.rb

class VideoInterview < ActiveRecord::Base
  has_many :bonds, :as => :sourceable
  has_many :bonds, :as => :targetable
end

How should i modify the model in orders to user this association correctly? If I call @question.bonds, I think there is something wrong because sourceable and targetable are defined under the same has_many :bonds. I'd like ti make @question.sources and get all the bonds with the question as sourceable element. Thank you

Upvotes: 2

Views: 835

Answers (1)

Abid
Abid

Reputation: 7227

you need have different names for your associations, naming both the associations bonds in case of sourceable and targetable will not work for you. you can name it any thing and provide a class_name to associate with bond model like this for the Question model

class Question < ActiveRecord::Base
  has_many :sources, :class_name => 'Bond', :as => :sourceable
  has_many :targets, :class_name => 'Bond', :as => :targetable
end

and similarly for the VideoInterview Model

class VideoInterview < ActiveRecord::Base
  has_many :sources, :class_name => 'Bond', :as => :sourceable
  has_many :targets, :class_name => 'Bond', :as => :targetable
end

now you can call functions like this @question.sources, @question.targets, @video_interview.sources, @video_interview.targets

hope that helps.

Upvotes: 2

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