这是我想要的mongodb嵌套文档，只需要非空的'manuelActivityInfo'对象。我如何编写Mongo查询呢？我共享了我的查询，但它需要空的活动，我只需要非空的记录，其中有'manuelActivityInfo'对象
db.getCollection（“会话活动”）.find（{“活动.手动活动信息”：{ $exists：true }}，{“_id”：0，“活动.活动ID”：1，“活动.手动活动信息.手动活动类型名称”：1，“活动.手动活动信息.手动活动主要主题ID”：1，“活动.手动活动信息.手动活动主要主题名称”：1，"活动.手动活动信息.手动活动详细主题ID“：1，”活动.手动活动信息.手动活动详细主题名称“：1}）.限制（5）

• 活动ID，-手动活动类型ID，-手动活动类型名称，-手动活动主要主题ID，-手动活动详细主题名称，-手动活动详细主题ID，-手动活动详细主题名称

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