4

我在猫鼬中有这个模式，当我使用带有更新的 pre 时，我得到了这个错误。

JobSchema.pre('update', function(n){n()})

完全错误

C:\web\production01_server\node_modules\production\node_modules\mongoose\lib\utils.js:413
        throw err;
              ^
TypeError: Cannot read property 'numAsyncPres' of undefined
    at Model._lazySetupHooks (C:\web\production01_server\node_modules\production\node_modules\mongoose\node_modules\hooks\hooks.js:149:49)
    at Model.pre (C:\web\production01_server\node_modules\production\node_modules\mongoose\node_modules\hooks\hooks.js:113:10)
    at Model.doQueue (C:\web\production01_server\node_modules\production\node_modules\mongoose\lib\document.js:1116:41)
    at Model.Document (C:\web\production01_server\node_modules\production\node_modules\mongoose\lib\document.js:55:8)
    at Model.Model (C:\web\production01_server\node_modules\production\node_modules\mongoose\lib\model.js:26:12)
    at Model.model (C:\web\production01_server\node_modules\production\node_modules\mongoose\lib\model.js:910:11)
    at new Model (C:\web\production01_server\node_modules\production\node_modules\mongoose\lib\connection.js:418:15)
    at cb (C:\web\production01_server\node_modules\production\node_modules\mongoose\lib\query.js:804:16)
    at C:\web\production01_server\node_modules\production\node_modules\mongoose\lib\utils.js:408:16
    at C:\web\production01_server\node_modules\production\node_modules\mongoose\node_modules\mongodb\lib\mongodb\cursor.js:133:9

笔记：

  • pre('保存' WORKS
  • post('update' 不会抛出错误并且不起作用
4

4 回答 4

10

Mongoose 4.0 通过 Query 中间件支持预更新挂钩。 http://mongoosejs.com/docs/middleware.html

schema.pre('update', function() {
  console.log(this instanceof mongoose.Query); // true
  this.start = Date.now();
});

schema.post('update', function() {
  console.log(this instanceof mongoose.Query); // true
  console.log('update() took ' + (Date.now() - this.start) + ' millis');
});

注意事项：

"查询中间件与文档中间件有一个微妙但重要的区别：在文档中间件中，this 指的是正在更新的文档。在查询中间件中，mongoose 不一定有对正在更新的文档的引用，所以this指的是查询对象而不是正在更新的文档。”

于 2015-06-07T18:50:27.650 回答
4

根据Mongoose 文档，pre 和 post 中间件功能支持：

  • 在里面
  • 证实
  • 节省
  • 消除

不支持更新。

于 2013-03-20T22:16:12.220 回答
3

It's true that Mongoose doesn't support hooks on Model APIs other than those Greg listed above. However, an update hook can be done via Monkey-patch. The Hooker NPM package is a good way of doing this cleanly.

The RESTeasy project which is a Boilerplate for Node REST APIs has code that demonstrates how to do it:

var hooker = require('hooker');

var BaseSchema = new mongoose.Schema({
  sampleString: {
    type: String
  }
});

var BaseModel = mongoose.model('Base', BaseSchema);

// Utilize hooks for update operations. We do it in this way because MongooseJS
// does not natively support update hooks at the Schema level. This is a way
// to support it.
hooker.hook (BaseModel, 'update', {
  pre: function () {
    // Insert any logic you want before updating to occur here
    console.log('BaseModel pre update');
  },
  post: function () {
    // Insert any logic you want after updating to occur here
    console.log('BaseModel post update');
  }
});

// Export the Mongoose model
module.exports = BaseModel;
于 2014-09-22T23:05:34.280 回答
1

我发现了这个：https ://github.com/LearnBoost/mongoose/issues/538 所以没有更新前...

于 2012-08-01T15:28:27.873 回答