ruby-on-rails - rails : Keeping all the ActiveRecord "validates" lines in a separate file?

Question

更新(2010 年 12 月 4 日):

我意识到每个validates line 实际上是一个方法调用(显然)，因此像这样要求它们并不完全符合我的预期。

这有效，但我不确定它是否正确(完全限定 Auction 类名):

class Auction::Validations
  Auction.validates :status, :presence => true,
                     :inclusion => { :in => [
                        Auction::CREATING,
                        Auction::OPEN,
                        Auction::PENDING,
                        Auction::CANCELLED,
                        Auction::SUSPENDED,
                        Auction::EXPIRED,
                        Auction::CLOSING_COMPLETED,
                        Auction::CLOSING_WON,
                        Auction::COMPLETED,
                        Auction::WON,
                        Auction::NEGOTIATING,
                        Auction::IN_ESCROW
                     ] }
  Auction.validates :user,   :presence => true
  Auction.validates :url,    :presence => true,
                     # FIXME: Move this to a URLValidator and do :url => true
                     :format => /^https?:\/\/[a-z0-9-]+(\.[a-z0-9-])*\.[a-z0-9]+\/.*/i
  Auction.validates :title,  :presence => true,
                     :length => { :maximum => 255 }
  Auction.validates :description,  :presence => true
  Auction.validates :reserve, :numericality => { :greater_than_or_equal_to => :minimum_bid }
end

当需要时 ( require 'auction/validations ) 进入 Auction类，它做正确的事情。

原问题如下:

我的几个模型类被所有这些“验证”调用弄得有点困惑，所以我想我可以将它们移到一个单独的类中并“要求”它，但它似乎不起作用。

class Auction < ActiveRecord::Base
  require 'auction/validations'
  ...

class Auction::Validations
  include ActiveModel::Validations

  validates :status, :presence => true,
                     :inclusion => { :in => [
                        ... snip ...
                     ] }
  validates :user,   :presence => true
  validates :url,    :presence => true,
                     # FIXME: Move this to a URLValidator
                     :format => /^https?:\/\/[a-z0-9-]+(\.[a-z0-9-])*\.[a-z0-9]+\/.*/i
  validates :title,  :presence => true,
                     :length => { :maximum => 255 }
  validates :description,  :presence => true
  validates :reserve, :numericality => { :greater_than_or_equal_to => :minimum_bid }

  validates_each :status, :on => :update do |auction, status_attr, value|
    if auction.state_machine.current_state != value
      # FIXME: Raise an Exception instead; this is a developer error, not a user error
      auction.errors.add status_attr, "Status cannot be changed directly"
    end
  end
end

它没有错误，但 validates_each 根本不执行该块(通过添加 puts "here" 进行测试)，并且数值检查不再起作用。

将这个类的主体盲目复制回 Auction 类，一切正常。

我是否误解了“要求”对这些验证的作用？

编辑:

事实上，所有验证都不起作用。不只是那两个。嗯。

Answer 1

我不确定这是否正确，但它以某种方式对我有用:

module MyValidations
  module User
    def self.included(base)
      base.validates_presence_of :firstname
    end
  end end

然后你可以打电话

User.class_eval do
  include MyValidations::User
end

希望有帮助。