mongoose – MissingSchema错误的人口

我有两个mongoose模型：

1-事件模型：

eventSchema = new mongoose.Schema({ name: { type: String, required: true, }, location: { type: { type: String, default: 'Point', required: true }, coordinates: { type: [Number], required: true }, }, sport: { type: mongoose.Schema.Types.ObjectId, ref: 'Sport', required: true, }, startDate: { type: Date, required: true, }, description: { type: String, required: true, }, host: { type: mongoose.Schema.Types.ObjectId, ref: 'User', required: true, }, players: [{ type: mongoose.Schema.Types.ObjectId, ref: 'User', }], }, { timestamps: true }); 

2-用户型号：

 userSchema = new mongoose.Schema({ email: { type: String, required: true, unique: true, }, password: { type: String, required: true, }, firstName: { type: String, required: true, }, lastName: { type: String, required: true, }, age: { type: Number, required: true, }, location: { type: String, }, }, { timestamps: true }); 

在我的EventService我试图通过idfind一个事件，并返回sport host和players填充的字段。 前两个字段在填充时不会产生任何错误，并且工作正常，但是问题在于players字段。 它会抛出这个错误：

 { MissingSchemaError: Schema hasn't been registered for model "players". Use mongoose.model(name, schema) at MissingSchemaError (/Users/elias/Documents/tfg/sporter-app/sporter-api/node_modules/mongoose/lib/error/missingSchema.js:20:11) at NativeConnection.Connection.model (/Users/elias/Documents/tfg/sporter-app/sporter-api/node_modules/mongoose/lib/connection.js:1043:11) at getModelsMapForPopulate (/Users/elias/Documents/tfg/sporter-app/sporter-api/node_modules/mongoose/lib/model.js:3569:20) at populate (/Users/elias/Documents/tfg/sporter-app/sporter-api/node_modules/mongoose/lib/model.js:3113:15) at _populate (/Users/elias/Documents/tfg/sporter-app/sporter-api/node_modules/mongoose/lib/model.js:3081:5) at Function.Model.populate (/Users/elias/Documents/tfg/sporter-app/sporter-api/node_modules/mongoose/lib/model.js:3041:5) at Immediate.<anonymous> (/Users/elias/Documents/tfg/sporter-app/sporter-api/node_modules/mongoose/lib/query.js:1441:17) at Immediate.<anonymous> (/Users/elias/Documents/tfg/sporter-app/sporter-api/node_modules/mquery/lib/utils.js:137:16) at runCallback (timers.js:781:20) at tryOnImmediate (timers.js:743:5) at processImmediate [as _immediateCallback] (timers.js:714:5) message: 'Schema hasn\'t been registered for model "players".\nUse mongoose.model(name, schema)', name: 'MissingSchemaError' } 

最后这就是我如何调用.populate()方法：

 const event = await Event.findById(eventId) .populate('sport', 'host', 'players') .exec(); 

有什么想法我做错了什么？ 谢谢！

Answer 1

尝试这个：

 const event = await Event.findById(eventId) .populate('sport') .populate('host') .populate('players') .exec() 

这里有一节在文档中填充多个path ： http : //mongoosejs.com/docs/populate.html

Answer 2

在使用mongoose.model（'name'，schema）之前，您需要使用mongoose.model（'name'，schema）来创build所有模型，因为它会在mongoose.models键/值上find需要在为该密钥运行时使用的模型。

因此，加载模型+连接，然后使用任何这些模型。