Rails 3:验证中的自定义错误消息

Question

我不明白为什么以下不适用于Rails 3.我得到"未定义的局部变量或方法`custom_message'"错误.

validates :to_email, :email_format => { :message => custom_message }

def custom_message
  self.to_name + "'s email is not valid"
end

我也尝试使用:message =>:custom_message,而不是像rails-validation-message-error帖子中建议的那样 没有运气.

:email_format是位于lib文件夹中的自定义验证器:

class EmailFormatValidator < ActiveModel::EachValidator
  def validate_each(object, attribute, value)
    unless value =~ /^([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i
      object.errors[attribute] << (options[:message] || 'is not valid')
    end
  end
end

Answer 1

如果有人感兴趣，我想出了以下解决方案来解决我的问题：

模型：

validates :to_email, :email_format => { :name_attr => :to_name, :message => "'s email is not valid" }

lib/email_format_validator.rb：

class EmailFormatValidator < ActiveModel::EachValidator

  def validate_each(object, attribute, value)
    unless value =~ /^([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i

      error_message = if options[:message] && options[:name_attr]
        object.send(options[:name_attr]).capitalize + options[:message]
      elsif options[:message]
        options[:message]
      else
        'is not valid'
      end

      object.errors[attribute] << error_message
    end
  end
end