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我确定我记得有一种方法可以获取脏资源的属性列表，但我似乎无法在任何地方找到该方法。
那么有什么方法可以返回一个脏属性数组吗？
dirty_attributes
这应该可以解决问题：
http://rubydoc.info/github/datamapper/dm-core/master/DataMapper/Resource#dirty_attributes-instance_method