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#2318 ✓resolved
Mike Breen

accepts_nested_attributes_for raises NoMethodError when saving polymorphic belongs_to

Reported by Mike Breen | March 23rd, 2009 @ 10:22 PM | in 2.3.6

If I have this relationship:

class Treasure < ActiveRecord::Base
  belongs_to :looter, :polymorphic => true

  accepts_nested_attributes_for :looter

class Pirate < ActiveRecord::Base
  has_one :treasures, :as => :looter

The following code will raise a NoMethodError "undefined method 'build_looter' for #<Treasure:0x23e8f94> : => 'pearl', :looter_attributes => {:catchphrase => "Arrr"})

This patch will give a friendlier ArgumentError "Cannot build association looter. Are you trying to build a polymorphic one-to-one association?"

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