如何在猫鼬中引用模式id？

Question

​

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

const CollageSchema = new Schema({
  collage_name: {
    type: String,
    required: [true, 'Name field is required']
  },
  university_id: {
    type: [{
      type: Schema.Types.ObjectId,
      ref: 'university'
    }]
  },
  type: {
    type: String,
    enum: ['autonomous', 'private'],
    required: [true, 'type field is required']
  }
});

const Collage = mongoose.model('collage', CollageSchema);
module.exports = Collage;

​

我参考了_id of UniversitySchema in CollageSchema，但它将采用大学表中不存在的任何university_id。请帮帮我。谢谢

Answer 1

默认情况下，模式中没有对任何引用对象Id进行任何验证，您可以做的是设置一个同步验证，并在其中进行findOne调用以进行验证。