Mongoose。Cannot read property 'where' of undefined, _id.

Question

我有那个型号。

var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var uniqueValidator = require('mongoose-unique-validator');

var EquipmentSchema = new Schema({
    model: { type: String, required: true, unique: true},
    price: { type: Number, required: true },
    comments: { type: String },
    market: { type: mongoose.Types.ObjectId, ref: 'Market', required: true },
    category: { type: mongoose.Types.ObjectId, ref: 'Category', required: true },
    make: { type: mongoose.Types.ObjectId, ref: 'Make', required: true },
    rv: [{ type: mongoose.Schema.Types.ObjectId, ref: 'Rv'}],
});

EquipmentSchema.plugin(uniqueValidator);
module.exports = mongoose.model('Equipments', EquipmentSchema);

这个函数用来保存新项目

const Equipments = require('./_models/equipment.model');

var equipmentSaver = function(equipment) {
  return new Promise((resolve, reject) => {
    console.log(equipment);
    const equipmentToSave = new Equipments({
      _id: equipment.type.model._id,
      market: equipment.type.market._id,
      category: equipment.type.category._id,
      make: equipment.type.make._id,
      model: equipment.type.model.name,
      price: equipment.economicDetails.price,
      comments: equipment.economicDetails.comments,
    });
    equipmentToSave.save()
      .then(result => resolve(result))
      .catch(error => reject(error))
   });
}

module.exports = equipmentSaver;

我从前面得到了JSON。

{
  type: {
    market: {
      _id: '5eb1a63926849bed71155592',
      name: 'Healthcare',
      icon: 'local_hospital'
    },
    category: {
      _id: '5eb19f080141dbe4b9aebc9a',
      name: 'Diagnostico por la imagen',
      market: '5eb1a63926849bed71155592'
    },
    make: {
      _id: '5ebd3e107002040000e70e53',
      name: 'GE',
      category: '5eb19f080141dbe4b9aebc9a'
    },
    model: {
      _id: '5ebd3e167002040000e70e54',
      name: 'Voluson S8',
      make: '5ebd3e107002040000e70e53'
    }
  },
  economicDetails: {
    comments: 'Description',
    price: 45000,
    used: false
  }
}

所有的 _ids 是由前面的人创建的，我得到的是 这2个错误: 1.

Error [ValidationError]: Equipments validation failed: _id: Cannot read property 'where' of undefined, model: Cannot read property 'where' of undefined
    at ValidationError.inspect
at processTicksAndRejections (internal/process/task_queues.js:93:5) {
      message: "Cannot read property 'where' of undefined",
      name: 'ValidatorError',
      properties: [Object],
      kind: 'unique',
      path: '_id',
      value: 5ebd3e167002040000e70e54,
      reason: TypeError: Cannot read property 'where' of undefined

2.

MongooseError [ValidatorError]: Cannot read property 'where' of undefined
        at new ValidatorError
at processTicksAndRejections (internal/process/task_queues.js:93:5) {
      message: "Cannot read property 'where' of undefined",
      name: 'ValidatorError',
      properties: [Object],
      kind: 'unique',
      path: 'model',
      value: 'Voluson S8',
      reason: TypeError: Cannot read property 'where' of undefined

我不知道为什么。我觉得这和这两个字段的 "唯一 "特征有关，但我不知道为什么会出现这个错误......

EDIT：我已经找到了错误的根源。当我删除了 EquipmentSchema.plugin(uniqueValidator); 从我的模型中，它又正确地保存了... ... 我已经创建了一个问题 mongoose-unique-validator的github。 但如果这里有人遇到过同样的问题，甚至有解决的办法，那就太好了!

谢谢！我已经有了那个模型： var mongoose = require('mongoose'); var Schema = mongoose.Schema = mongoose.Schema。

Answer 1

我发现问题出在你的一个字段的名字上，这个字段就是 model 领域中 EquipmentSchema

var EquipmentSchema = new Schema({
    //this throws Cannot read property 'where' of undefined
    model: { type: String, required: true, unique: true} 
    ...
})

当你把这个字段改名为其他字段或删除它时，插件就能正常工作了。mongoose-unique-validator 插件问题，因为 model 不在 保留文件键列表的獴。

通过查看 这部分插件代码最新版本），你可以看到有 if ... else if ... 的条件下找到的。model，并定义了一个名为 model 正如你所做的那样，使所有的条件都失败了，并留下了。model 变量未定义，最后抛出错误。