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Example:

class Human < ActiveRecord::Base
  has_one :address, :as => :addressable
end

class Company < ActiveRecord::Base
  has_one :address, :as => :addressable
end

class Address < ActiveRecord::Base
  belongs_to :addressable, :polymorphic => true
end
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Without this association, we have all these foreign keys in our Address table but we only would ever have a value for one of them because an address, in this scenario, can only belong to one entity (Human or Company).

Output

It would look like:

class Address < ActiveRecord::Base
  belongs_to :human
  belongs_to :company
end
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