带有 Mongoose 的 typescript : cannot read property 'CasterConstructor' of undefined

Question

我正在使用 typescript 和 Mongoose 编写一个 node.js 应用程序。我正在使用 typescript 模型方法，并在调用创建方法创建新子文档时继续收到“无法读取未定义的属性 CasterConstructor”。下面概述了代码示例:

seat.ts:
export let SeatSchema: Schema = new Schema({
    travelerId: {type: Schema.Types.ObjectId, required: true},
    seatClass: {type: Schema.Types.String, minlength: 5, maxlength:10, required: true, enum: [“FirstClass”, “Coach”]},
    row: {type: Schema.Types.Number, required: true},
    section: {type: Schema.Types.Number, required: true},
    hasBoarded: {type: Schema.Types.Boolean, required: false}
});


plane.ts:
export let PlaneSchema: Schema = new Schema({
    manufacturer: {type: Schema.Types.String, required: true},
    seatsChart: [SeatSchema],
    routeId: [{type: Schema.Types.ObjectId, ref: ‘routes’, required: true}];

iseat.ts: 
export interface ISeat {
    travelerId: string,
    seatClass: string,
    row: number,
    section: number,
    hasBoarded: boolean
}


iplane.ts:
export interface IPlane {
    manufacturer: string,
    seatsChart: Types.DocumentArray<ISeatModel>,
    routeId: [string]
}

iseatmodel.ts:
export interface ISeatModel extends ISeat, Subdocument {
}

iplanemodel.ts:
export interface IPlaneModel extends IPlane, Document {
}

planerepository.ts:
constructor(db) {
    this._model: Model<IPlaneModel> = db.model<IPlaneModel>(“Plane”, PlaneSchema);
}
.
.
.
addNewSeat(planeId: string, seat: ISeat) {
    let plane: IPlaneModel = await this._model.findById(planeId);
    let newSeat: ISeatModel = plane.SeatsChart.create(seatAttributes);
    plane.seatsChart.push(newSeat);
    let planeUpdated: IPlane = await plane.save();
}

这是我不断收到的错误:类型错误:无法读取未定义的属性“casterConstructor” 在 Array.create (/node_modules/mongoose/lib/types/documentarray.js:236:35) . . . . .

我没有看到我可能遗漏了什么。有人可以查看并让我知道我可能遗漏了什么，以及这是否是正确的方法。

更新:我改用push后，问题好像出在/mongoose/lib/types/array.js, _checkManualPopulation:

function _checkManualPopulation(arr, docs) {
  var ref = arr._schema.caster.options && arr._schema.caster.options.ref;
  if (arr.length === 0 &&
      docs.length > 0) {
    if (_isAllSubdocs(docs, ref)) {
      arr._parent.populated(arr._path, [], { model: docs[0].constructor });
    }
  }
}

由于某些原因，调用 push 时未定义 _schema 对象，这会导致异常。我不确定这是一个错误，还是没有调用其他会初始化 _schema 属性的东西？

Answer 1

我不确定你在添加子文档时在做什么？您应该将其添加为 POJO。

以下代码已经过测试，可以正常工作。

async function addNewSeat(planeId: string, seat: ISeat) {
  let plane = await PlaneModel.findById(planeId);
  plane.seatChart.push(seat);
  await plane.save();
}

然后像下面这样调用它:

let plane = await PlaneModel.create({flightNumber:"AR44"});
await addNewSeat(plane.id, {
     travelerId:"x", 
     seatClass:"business", 
     row:4, 
     section:9, 
     hasBoarded:true
});
await addNewSeat(plane.id, {
     travelerId:"y", 
     seatClass:"economy", 
     row:42, 
     section:1, 
     hasBoarded:true
});