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mongodb 的 $addToSet 怎么添加排序？

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mongodb 的 $addToSet 怎么添加排序？

在使用 $addToSet 的同时，我希望数组元素按大小排序。
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  1. 先通过 addToSet 添加数组的长度字段
  2. 再通过长度字段排序

这个需要两步设置


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