Mongodb 子文档验证接收文档数组

我有一个包含子项（小部件）的父模式（仪表板）

问题是我需要验证单个小部件，但是

.pre（'save'）

接收小部件数组

有没有办法验证单个属性？我试图添加

widgetSize:{type:String，validate:xxx}

，但没有成功

var widgetSchema = new Schema({
  _id: Schema.Types.ObjectId,
  measurement: { type: String, required: true },
  type: { type: String, required: true },
  key: { type: String, default: '' },
  background: { type: Schema.Types.Mixed, default: false },
  localeId: { type: Schema.Types.Mixed, default: false },
  hintText: String,
  widgetSize: { type: String }
});

widgetSchema.pre('save', function (next) {
  console.log(this);
  if(!sizeValidator(this.widgetSize)) {
    return next(new Error('Size format was incorrect: ' + this.widgetSize));
  }
  next();
});

var dashboardSchema = new Schema({
  slug: { type: String, required: true },
  name: { type: String, required: true },
  backgroundImage: String,
  defaultDashboard: { type: Boolean, default: false },
  backgroundColor: String,
  widgets: [widgetSchema]
});

用于添加子文档的代码

dashboard.widgets.push(widgetToCreate);
return dashboard.saveAsync(); // promisified

---

看起来您正在使用

this

验证子文档值，正如您所注意到的，该子文档值设置为顶级文档。更直接地说，您可以使用传递给validate函数的值，如下所示：

var widgetSchema = new Schema({
  _id: Schema.Types.ObjectId,
  measurement: {
    type: String,
    required: true
  },
  type: {
    type: String,
    required: true
  },
  key: {
    type: String,
    default: ''
  },
  background: {
    type: Schema.Types.Mixed,
    default: false
  },
  localeId: {
    type: Schema.Types.Mixed,
    default: false
  },
  hintText: String,
  widgetSize: {
    type: String,
    validate: function widgetSizeValidate(val) {
      return val === 'foobar';
    }
  }
});

---

在Mongo3.2中，将进行验证。也许这会有帮助