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1、copy_data怎么使用，跟属性copy有啥区别？
copy_data
copy
2、copy=True也不能复制One2Many和Many2Many类型的数据，有方法可以复制吗？ copy的时候能按角色有选择的复制部分字段的值吗？
copy=True
One2Many
Many2Many