如何对mongoose模型保存*和*它的保存挂钩

Question

为什么这段代码会因为“你应该找不到我”错误信息失败而不是只打印“保存存根被叫”并退出？

var mongoose = require('mongoose'),
  Schema = mongoose.Schema,
  modelSchema,
  ModelClass,
  modelInstance;

modelSchema = new Schema({name: {type: String}});
modelSchema.pre('save', function (next) {
  throw new Error('you should have stubbed me');
});
ModelClass = mongoose.model('Model', modelSchema);
ModelClass.prototype.save = function () { console.log('Save stub called'); }
modelInstance = new ModelClass();
modelInstance.save();

我已经看到这种存储模型的保存功能的方法非常普遍推荐，所以我很惊讶它并没有阻止预保存挂钩也被执行。

Answer 1

添加行Schema.prototype.pre = function () {};解决了这个问题。

var mongoose = require('mongoose'),
  Schema = mongoose.Schema,
  modelSchema,
  ModelClass,
  modelInstance;

Schema.prototype.pre = function () {};
modelSchema = new Schema({name: {type: String}});
modelSchema.pre('save', function (next) {
  throw new Error('you should have stubbed me');
});
ModelClass = mongoose.model('Model', modelSchema);
ModelClass.prototype.save = function () { console.log('Save stub called'); }
modelInstance = new ModelClass();
modelInstance.save();