vendor/rails/activerecord/lib/active_record/associations/has_one_through_association.rb

   1 module ActiveRecord
   2   module Associations
   3     class HasOneThroughAssociation < HasManyThroughAssociation
   4
   5       def create_through_record(new_value) #nodoc:
   6         klass = @reflection.through_reflection.klass
   7
   8         current_object = @owner.send(@reflection.through_reflection.name)
   9
  10         if current_object
  11           current_object.update_attributes(construct_join_attributes(new_value))
  12         else
  13           @owner.send(@reflection.through_reflection.name,  klass.send(:create, construct_join_attributes(new_value)))
  14         end
  15       end
  16
  17     private
  18       def find(*args)
  19         super(args.merge(:limit => 1))
  20       end
  21
  22       def find_target
  23         super.first
  24       end
  25
  26       def reset_target!
  27         @target = nil
  28       end
  29     end
  30   end
  31 end