#62 Hacking ActiveRecord

最新推荐文章于 2012-04-25 14:15:24 发布

原创最新推荐文章于 2012-04-25 14:15:24 发布 · 87 阅读

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本文介绍了一种在Ruby on Rails中临时禁用ActiveRecord验证的方法。通过扩展ActiveRecord::Base类，实现了一个可以在特定范围内禁用所有验证的功能。这对于批量操作或者测试非常有用。

Have you ever wanted to temporarily disable all validations? Well, ActiveRecord doesn't support this, but that doesn't mean we can't add it. This episode will show you how to open up an existing class and change its behavior.

# test_helper.rb
class Test::Unit::TestCase
  self.use_transactional_fixtures = true
  self.use_instantiated_fixtures  = false

  def disable_validation
    ActiveRecord::Base.disable_validation!
    yield
    ActiveRecord::Base.enable_validation!
  end
end

module ValidationDisabler
  def self.included(base)
    base.class_eval do
      extend ClassMethods
      alias_method_chain :valid?, :disable_check
    end
  end

  def valid_with_disable_check?
    if self.class.validation_disabled?
      true
    else
      valid_without_disable_check?
    end
  end

  module ClassMethods
    def disable_validation!
      @@disable_validation = true
    end

    def enable_validation!
      @@disable_validation = false
    end

    def validation_disabled?
      @@disable_validation ||= false
    end
  end
end

class ActiveRecord::Base
  include ValidationDisabler
end