node.js - 预删除中间件不触发

Question

我正在使用 mongoose 并尝试级联删除，但不幸的是我的预删除中间件由于某种原因没有触发。

  var presentationSchema = new Schema({
    id: Number,
    title: String,
    pdfURL: String,
    created_at: Date,
    updated_at: Date,
    slides: [{
      type: Schema.Types.ObjectId,
      ref: 'Slide'
    }]
  });

  presentationSchema.pre('remove', function(next) {
    console.log("delete slides" + this._id);
      next();
  });

  // the schema is useless so far
  // we need to create a model using it
  var Presentation = mongoose.model('Presentation', presentationSchema);


  // make this available to our users in our Node applications
  module.exports = Presentation;

Answer 1

也许您会被 this mongoose "feature" 迷住:

Note: There is no query hook for remove(), only for documents. If you set a 'remove' hook, it will be fired when you call myDoc.remove(), not when you call MyModel.remove(). Note: The create() function fires save() hooks.

你的 pre('remove',...) 中间件将在你调用 myPres.remove() 时触发，而不是在从模型中调用 remove 函数时触发，例如 Presentation.remove()