set_owner_attributes

# File activerecord/lib/active_record/associations/foreign_association.rb, line 22
      def set_owner_attributes(record)
        return if options[:through]

        primary_key_attribute_names = Array(reflection.join_primary_key)
        foreign_key_attribute_names = Array(reflection.join_foreign_key)

        primary_key_foreign_key_pairs = primary_key_attribute_names.zip(foreign_key_attribute_names)

        primary_key_foreign_key_pairs.each do |primary_key, foreign_key|
          value = owner._read_attribute(foreign_key)
          record._write_attribute(primary_key, value)
        end

        if reflection.type
          record._write_attribute(reflection.type, owner.class.polymorphic_name)
        end
      end