<commit_before>module Id
  module Model
    class HasOne < Association

      def define_getter
        field = self
        model.send :define_method, name do
          memoize field.name do
            field.type.new(data.fetch(field.key, nil))
          end
        end
      end

    end
  end
end<commit_msg>Dont try to create has_one associations if theyre nil<commit_after>module Id
  module Model
    class HasOne < Association

      def define_getter
        field = self
        model.send :define_method, name do
          memoize field.name do
            child = data.fetch(field.key, nil)
            field.type.new(child) unless child.nil?
          end
        end
      end

    end
  end
end
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