Rails: Many to many polymorphic relationships

Question

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I\'ve been struggling to get a clear and straight-forward answer on this one, I\'m hoping this time I\'ll get it! :D I definitely have

Answer 1

You can combine polymorphism and has_many :through to get a flexible mapping:

class Assignment < ActiveRecord::Base
  belongs_to :task
  belongs_to :target, :polymorphic => true
end

class Task < ActiveRecord::Base
  has_many :targets, :through => :assignment
end

class Store < ActiveRecord::Base
  has_many :tasks, :through => :assignment, :as => :target
end

class Vehicle < ActiveRecord::Base
  has_many :tasks, :through => :assignment, :as => :target
end

...And so forth.