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动态属性必填怎么实现？
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动态属性必填怎么实现？
一般的接口的 更新 和新增的 实体基本都是一致的，但是有些属性，新增的时候非空，更新的时候允许为 null（null 则不进行更新操作），这样情况下下，就要让接口文档在新增的时候要求属性必填，更新的时候非必填，怎么实现呢？
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