Rails 3自定义格式化验证错误？

Question

有了这个型号:

validates_presence_of :email, :message => "We need your email address"

作为一个相当做作的例子.错误出现为:

Email We need your email address

我如何自己提供格式？

我看了源代码,ActiveModel::Errors#full_messages它做到了这一点:

def full_messages
  full_messages = []

  each do |attribute, messages|
    messages = Array.wrap(messages)
    next if messages.empty?

    if attribute == :base
      messages.each {|m| full_messages << m }
    else
      attr_name = attribute.to_s.gsub('.', '_').humanize
      attr_name = @base.class.human_attribute_name(attribute, :default => attr_name)
      options = { :default => "%{attribute} %{message}", :attribute => attr_name }

      messages.each do |m|
        full_messages << I18n.t(:"errors.format", options.merge(:message => m))
      end
    end
  end

  full_messages
end

注意:default选项中的格式字符串？所以我尝试过:

validates_presence_of :email, :message => "We need your email address", :default => "something"

但是,错误消息实际上显示为:

Email something

所以我尝试包含插值字符串%{message},从而覆盖%{attribute} %{message}Rails默认使用的版本.这会导致异常:

在SubscriptionsController #create中I18n :: MissingInterpolationArgument

"%{message}"中缺少插值参数({:model =>"Subscription",:attribute =>"Email",:value =>""}给出

然而,如果我使用插值字符串%{attribute},它不会出错,它只会吐出两次人性化的属性名称.

有人有这方面的经验吗？我总是可以首先使用属性名称,但通常我们需要一些其他字符串(营销人员总是让事情变得更复杂!).

Answer 1

错误:base不是特定于任何属性,因此人性化的属性名称不会附加到消息中.这允许我们添加有关电子邮件的错误消息,但不将它们附加到电子邮件属性,并获得预期的结果:

class User < ActiveRecord::Base
  validate :email_with_custom_message
  ...
  private

  def email_with_custom_message
    errors.add(:base, "We need your email address") if
      email.blank?
  end
end