猫鼬stringify删除空元素 [英] mongoose stringify removes empty elements

问题描述

我要从我的mongo数据库中获取一个带有空值的 mongoose 对象:

I am retreiving a mongoose object with an empty values from my mongo db :

{ _id: 53049728456d4416243bf65f,
  userCreated: {},
  status: { userCreated: {} },
  user: 'patrice',
}

这很好，因为没有数据.

which is fine because there is no data.

但是当我使用 JSON.stringify(obj) stringify 时，我得到了:

But when I stringify with JSON.stringify(obj) this i get :

{ _id: 53049728456d4416243bf65f,
  user: 'patrice'
}

userCreated 和 status 的键尚未进行字符串化，也不会出现在我的输出中...

the keys userCreated and status haven't been stringified and don't appear in my output...

有人知道这是从哪里来的，如何获得它吗?

Any idea where this comes from and how to get arrount it ?

我的模型是这样的:

new mongoose.Schema({
  user: type: String, default: '',
  status: {
    name: { type: String, default: '' },
    userCreated: {
      time: { type: Date, default: Date.now }
    }
  },
  userCreated: {
    time: { type: Date, default: Date.now }
  }
})

P.

推荐答案

JSON.stringify通常不会剥离空对象，因此这是猫鼬特有的.

JSON.stringify doesn't normally strip empty objects, so this is mongoose specific.

我建议尝试.toObject()或.toJSON()

I'd recommend trying .toObject() or .toJSON()

http://mongoosejs.com/docs/api.html#document_Document-toObject

该对象将在.stringify期间被调用，因此可能是切出空对象的原因. http://mongoosejs.com/docs/api.html#document_Document-toJSON

This one will get called during .stringify so it probably is what is cutting out the empty objects. http://mongoosejs.com/docs/api.html#document_Document-toJSON

因此，请首先尝试:

JSON.stringify(obj.toObject());

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