const EventSchema = new Schema({ dates: [Number], reason: { type: String, required: true }, userId: Schema.Types.ObjectId, type: { type: String, required: true } });

const CalendarSchema = new Schema({ date: { type: Number, index: { unique: true } }, events: [EventSchema] });

在mongoose张这样嵌入子文档应该是没问题的吧？可我在插入子文档的时候报错了

.post(({ body }, res, next) => { const event = new Event(body); event.save() .then(savedEvent => { let promises = []; for (date of body.dates) { promises.push(Calendar.update({date}, { $push: savedEvent._doc })); } return Promise.all(promises); }) .then(() => res.end()) .catch(next); })

错误:
The field '_id' must be an array but is of type OID in document {_id: ObjectId('57c5a02c8890a02814771df1')}

是我哪里写错了吗？