write_attribute

# File activemodel/lib/active_model/attributes.rb, line 75
      def write_attribute(attr_name, value)
        name = if self.class.attribute_alias?(attr_name)
          self.class.attribute_alias(attr_name).to_s
        else
          attr_name.to_s
        end

        @attributes.write_from_user(name, value)
        value
      end