仅当不是空白Rails 3时才验证电子邮件格式

Question

我想仅在输入电子邮件时验证电子邮件.

我尝试了以下方法:

validates :email, :presence => {:message => "Your email is used to save your greeting."},
                  :email => true,
                  :if => Proc.new {|c| not c.email.blank?},
                  :uniqueness => { :case_sensitive => false }

但是这不起作用,因为它会在电子邮件留空时阻止显示错误消息.

如何在缺少电子邮件时验证电子邮件是否存在,并且仅在输入时验证格式？

Answer 1

这应该可以解决问题.

validates :email,:presence => {:message => "Your email is used to save your greeting."}, :allow_blank => true,:uniqueness => { :case_sensitive => false } 

使用:allow_blank => true或:allow_nil => true, :if => :email?

编辑:修复拼写错误.

Answer 2

您可以编写自定义验证功能:

class Model < ActiveRecord::Base
  validate :check_email

  protected
  def check_email
    if email.blank?
      validates :email, :presence => {:message => "Your email is used to save your greeting."}
    else
      validates :email,
        :email => true,
        :uniqueness => { :case_sensitive => false }      
    end
  end
end

或将您的验证人分成2个独立的验证人,条件如下:

validates :email, 
  :presence => {:message => "Your email is used to save your greeting."}, 
  :if => Proc.new {|c| c.email.blank?}

validates :email, 
  :email => true,
  :uniqueness => { :case_sensitive => false }
  :unless => Proc.new {|c| c.email.blank?}