Rails 3:验证:presence => true vs validates_presence_of

Question

validates :presence和之间有什么区别validates_presence_of？通过ActiveModel它看起来他们以相同的方式设置验证.但是,给定以下模型定义:

class Account < ActiveRecord::Base
  has_one :owner_permission, :class_name => 'AccountPermission', :conditions => { :owner => true, :admin => true }
  has_one :owner, :class_name => 'User', :through => :owner_permission, :source => :user

  validate :owner, :presence => true
  validates_associated :owner
end

在实例上调用save Account不会验证所有者的存在.但是,如果我使用validates_presence_of它会.

Answer 1

所有这些validates_whatever_of :attr宏都是通话validates :attr, :whatever => true.

问题是你正在使用validate而不是validates.

Answer 2

在Rails 3.x和4.x中 - 现在鼓励使用以下语法:

validates :email, presence: true
validates :password, presence: true

而不是2.x方式:

validates_presence_of :email
validates_presence_of :password