Question

目前，我有三个相互关联的“用户”，“用户位置”和“用户地址”集合。

以下是架构

UserModel

var userTable = new Schema({
  name: String,
  email : String
});

module.exports = mongoose.model('user', userTable );

UserLocationModel

var userLocationTable = new Schema({
  location : String,
  user_id :{
    type : ObjectId,
    ref : 'user',
  }
});

module.exports = mongoose.model('userLocation',userLocationTable);

UserAddressModel

var userAddressTable = new Schema({
    userLocationID : {
      type : ObjectID,
      ref : 'userLocation',
    },
   address : String
});

module.exports = mongoose.model('userAddress',userAddressTable);

我的代码

UserModel.aggregate([
        {
            "$lookup": {
                "from": "userlocations",
                "localField": "_id",
                "foreignField": "user_id",
                "as": "location"
            }
        },
        {
            "$unwind" : "$location"
        },
        {
            "$lookup": {
                "from": "useraddresses",  
                "localField": "location._id",
                "foreignField": "userLocationID",
                "as": "location.address"
            }
        },
    ]).exec((err, data) => {
        if (err) throw err;
        res.send(data);
    })

当前输出

[
{
    "_id": "5d8b1e6ca4d1ab5e54f1b8ee",
    "name": "Shivam",
    "email": "ee@gmail.com",
    "__v": 0,
    "location": {
        "_id": "5d8b1e6ca4d1ab5e54f1b8ef",
        "location": "Mumbai",
        "user_id": "5d8b1e6ca4d1ab5e54f1b8ee",
        "__v": 0,
        "address": []
    }
},
{
    "_id": "5d8b3a740b6fee55ac39a61d",
    "name": "ameet",
    "email": "ddt@gmail.com",
    "__v": 0,
    "location": {
        "_id": "5d8b3a740b6fee55ac39a61e",
        "location": "sion",
        "user_id": "5d8b3a740b6fee55ac39a61d",
        "__v": 0,
        "address": []
    }
}
]

这里的问题是我无法从UserAddress模型中获取数据。我尝试了所有可能的方法，但无法从UserAddress集合中获取数据。有人可以帮我吗？

在Mongoose中使用查找从多个集合中获取数据的问题

0 个答案: