node.js - Mongoose pre.remove 数组中对象的中间件永远不会被调用

Question

这是问题 https://github.com/Automattic/mongoose/issues/6224 的副本.

我在名为 Space 的对象数组中创建了一个名为 FileSpace 的嵌入对象。删除 FileSpace 时，永远不会调用预删除中间件(但会调用预验证中间件)

这是一个重现代码:

'use strict';var mongoose = require('mongoose'),    Schema = mongoose.Schema;mongoose.set('debug', true);/** *  A file */var FileSpaceSchema = new Schema({    fileKey: {        type: String,        required: true    }});// Normally called FileSpaceSchema.pre('validate', function (next) {    console.log('Calling FileSpace.pre.validate me="%s"', this.fileKey);    next();});// Never called !FileSpaceSchema.pre('remove', function(next) {    console.log(' !!! Calling FileSpace.pre.remove fileKey="%s"', this.fileKey);    next();});let FileSpace = mongoose.model('FileSpace', FileSpaceSchema);/** * A space containing an array of files */var SpaceDocSchema = new Schema({    label: {        type: 'string',        required: true    },    files: [FileSpaceSchema]});SpaceDocSchema.pre('validate', function (next) {    console.log('Calling SpaceDocSchema.preValidate hook spaceDoc is "%s"', this.label);    next();});SpaceDocSchema.pre('remove', function (next) {    console.log('Calling Space.post.remove spaceDoc is "%s"', this.label);    next();});let SpaceDoc = mongoose.model('SpaceDoc', SpaceDocSchema);console.log('--> Starting');console.log('--> Creating a space');let space = new SpaceDoc({    label: 'The SpaceDoc'}),    removedFile;// connect to mongomongoose.connect('mongodb://mongodbsrv/clouderialTestDB?w=1&j=true');mongoose.connection.on('open', () => {    console.log('Connection to MongoDB is effective');    space.save()        .then((s) => {            space = s;            console.log('Created space is "%s"', s.label);            console.log('--> Creating a FileSpace');            return new FileSpace({fileKey : 'fileSpace', spaceLabel:'The space label'}).save();        })        .then((fs) => {            console.log('Created FileSpace is "%s"', fs.fileKey);            console.log('--> Add fileSpace into SpaceDoc.files');            space.files.push(fs);            space.markModified('files');            return space.save();        })        .then((s) => {            space = s;            console.log('Updated space is "%s", nbFiles="%d"', space.label, space.files.length);            console.log('--> Remove fileSpace from space');            removedFile = space.files[0];            space.files.splice(0, 1);//          space.files = [];            space.markModified('files');            console.log('--> Update space without file');            return space.save();        })        .then((s) => {            space = s;            console.log('Updated space is "%s", nbFiles="%d"', space.label, space.files.length);            console.log('--> Remove fileSpace');            return removedFile.remove();        })        .then(() => {            console.log('--> Should see the call to pre.remove of FileSpace');            console.log('--> Remove space');            return space.remove();        })        .catch(console.error);});setTimeout(() => {    console.log('--> Close MongoDB connection');    mongoose.connection.close();}, 3000);

输出如下:

$ npm start> test@0.0.1 start /datas/cld-apps/test> NODE_PATH=/home/vagrant/cld-apps/node_modules:. TZ=Europe/Paris node test.js--> Starting--> Creating a spaceConnection to MongoDB is effectiveCalling SpaceDocSchema.preValidate hook spaceDoc is "The SpaceDoc"Mongoose: spacedocs.insert({ label: 'The SpaceDoc', files: [], _id: ObjectId("5aa18e47f13311778fdc3beb"), __v: 0 })Created space is "The SpaceDoc"--> Creating a FileSpaceCalling FileSpace.pre.validate me="fileSpace"Mongoose: filespaces.insert({ fileKey: 'fileSpace', _id: ObjectId("5aa18e47f13311778fdc3bec"), __v: 0 })Created FileSpace is "fileSpace"--> Add fileSpace into SpaceDoc.filesCalling SpaceDocSchema.preValidate hook spaceDoc is "The SpaceDoc"Calling FileSpace.pre.validate me="fileSpace"Mongoose: spacedocs.update({ _id: ObjectId("5aa18e47f13311778fdc3beb"), __v: 0 }, { '$set': { files: [ { fileKey: 'fileSpace', _id: ObjectId("5aa18e47f13311778fdc3bec"), __v: 0 } ] }, '$inc': { __v: 1 } })Updated space is "The SpaceDoc", nbFiles="1"--> Remove fileSpace from space--> Update space without fileCalling SpaceDocSchema.preValidate hook spaceDoc is "The SpaceDoc"Mongoose: spacedocs.update({ _id: ObjectId("5aa18e47f13311778fdc3beb"), __v: 1 }, { '$set': { files: [] }, '$inc': { __v: 1 } })Updated space is "The SpaceDoc", nbFiles="0"--> Remove fileSpace--> Should see the call to pre.remove of FileSpace--> Remove spaceCalling Space.post.remove spaceDoc is "The SpaceDoc"Mongoose: spacedocs.remove({ _id: ObjectId("5aa18e47f13311778fdc3beb") }, {})--> Close MongoDB connection

预期行为是什么？我们应该看到日志行:

!!! Calling FileSpace.pre.remove fileKey

请提及您的node.js、mongoose 和 MongoDB 版本。 Node 9.5.0、Mongoose 5.0.9、MongoDB 3.6.3、Mongo 驱动程序:3.0.3

编辑:如果我删除 space.files.push(fs) 行，则可以正确调用中间件。仅当 fileSpace 放入空间对象数组中时，pb 才会发生。

Answer 1

文档说:

Model.remove() - This method sends a remove command directly to MongoDB, no Mongoose documents are involved. Because no Mongoose documents are involved, no middleware (hooks) are executed.

链接:[https://mongoosejs.com/docs/api.html]