Question

我有Patient个模型，其中包含对Path的引用：

const PatientSchema = Schema({
  idPatient: Schema.Types.ObjectId,
  firstName: String,
  lastName: String,
  path: {type: Schema.Types.ObjectId, ref: 'Path'}
});

Path模型，其中包含对Zone的引用数组：

const PathSchema = connection.mongoose.Schema({
  zones: [{
    type: connection.mongoose.Schema.Types.ObjectId,
    ref: 'Zone'
  }],
});

最后是Zone模型：

const ZoneSchema = connection.mongoose.Schema({
  name: String,
  duration: Number,
});

我正在尝试让所有患者了解其路径以及患者内部每个路径的区域：

下面是在患者身上进行简单填充的数据示例：

[
  {
    "_id": "5d00b7dab927301ad392e6e4",
    "idPatient": "5d00b7dab927301ad392e6e5",
    "firstName": "Amine",
    "lastName": "Harbaoui",
    "path": {
        "_id": "5d010263b927301ad392e6ea",
        "zones": [
            "5d010c72b927301ad392e6eb",
            "5d010cf7b927301ad392e6ec"
        ]
    }
  }
]

这里是我如何获得想要的东西：

Patient.find()
    .lean()
    .populate('path')
    .exec((error, patients) => {
      if (error) {
        console.log(error);
      } else {
        const zones = patients.map(p => p.path.zones);
        Path.populate(zones, {
          path: 'zones'
        }, (error, data) => {
          if (error) {
            console.log(error);
          } else {
            console.log(data);
          }
        })
      }
    })

但这是我得到的例外：

{MissingSchemaError：尚未为模型“ Zone”注册架构。使用mongoose.model（名称，模式）在新的MissingSchemaError（/home/amine/ubudu/app_mn/sprint0/server/node_modules/mongoose/lib/error/missingSchema.js:22:11）在NativeConnection.Connection.model（/home/amine/ubudu/app_mn/sprint0/server/node_modules/mongoose/lib/connection.js:888:11）在getModelsMapForPopulate（/home/amine/ubudu/app_mn/sprint0/server/node_modules/mongoose/lib/model.js:4337:57）在填充（/home/amine/ubudu/app_mn/sprint0/server/node_modules/mongoose/lib/model.js:3915:21）在_populate（/home/amine/ubudu/app_mn/sprint0/server/node_modules/mongoose/lib/model.js:3885:5）在utils.promiseOrCallback.cb（/home/amine/ubudu/app_mn/sprint0/server/node_modules/mongoose/lib/model.js:3858:5）在Object.promiseOrCallback（/home/amine/ubudu/app_mn/sprint0/server/node_modules/mongoose/lib/utils.js:248:12）在Function.Model.populate（/home/amine/ubudu/app_mn/sprint0/server/node_modules/mongoose/lib/model.js:3857:16）在Patient.find.lean.populate.exec（/ home / amine / ubudu / app_mn / sprint0 / server / controllers / PatientController.js：61：14）在/home/amine/ubudu/app_mn/sprint0/server/node_modules/mongoose/lib/model.js:4733:16 在/home/amine/ubudu/app_mn/sprint0/server/node_modules/mongoose/lib/utils.js:263:16 在_hooks.execPost（/home/amine/ubudu/app_mn/sprint0/server/node_modules/mongoose/lib/query.js:4224:11）在/home/amine/ubudu/app_mn/sprint0/server/node_modules/kareem/index.js:135:16 在process._tickCallback（internal / process / next_tick.js：61：11）消息中：“尚未为模型“区域”注册架构。\ n使用 mongoose.model（name，schema）'，名称：'MissingSchemaError'}

Answer 1

只要您使用的是猫鼬的最新版本，就可以在一个查询中填充深度嵌套的值。

Patient.find()
.populate({
    path: 'path',
    populate: {
       path: 'zones'
    }
}).exec()

猫鼬：人口众多

1 个答案: