module Plumb::Attributes::ClassMethods

def __plumb_define_attribute_writer_method__(name)
  define_method("#{name}=") do |value|
    type = self.class._schema.at_key(name)
    result = type.resolve(value)
    @attributes[name] = result.value
    if result.valid?
      @errors.delete(name)
    else
      @errors.merge!(name => result.errors)
    end
    result.value
  end
end