Question

所以我有schema Town，我想删除一个包含所有广告的城镇以及所有与广告相关的关系。这是我的模式：

let adSchema = mongoose.Schema (
{
    author: {type: ObjectId, ref: 'User'},
    category: {type: ObjectId, ref: 'Category', required: true},
    town: {type: ObjectId, ref: 'Town', required: true},
}

）;

let categorySchema = mongoose.Schema (
{
    name: {type: String, required:true, unique: true},
    ads: [{type: ObjectId, ref: 'Ad'}]
}

）;

let townSchema = mongoose.Schema (
{
    name: {type: String, required:true, unique:true},
    ads: [{type: ObjectId, ref: 'Ad'}]
}

）;

let userSchema = mongoose.Schema(
{
    email: {type: String, required: true, unique: true},
    ads: [{type: ObjectId, ref: 'Ad'}],
}

）;

我正在使用此代码执行此操作：

let id = req.params.id;
    Town.findByIdAndRemove(id).populate('ads').then(town => {
        let ads = town.ads;
        if (ads.length !== 0) {
            ads.forEach(ad => {
                Ad.findByIdAndRemove(ad.id).populate('author category').then(ad => {
                    let author = ad.author;
                    let category = ad.category;
                    let authorIndex = author.ads.indexOf(ad.id);
                    let categoryIndex = category.ads.indexOf(ad.id);

                    category.ads.splice(categoryIndex,1);
                    category.save(err => {
                        if (err) console.log(err);
                    });
                    author.ads.splice(authorIndex, 1);
                    author.save().then(() => {
                        res.redirect('towns');
                    })
                })
            });
        } else {
            res.redirect('/');
        }
    })

实际上一切正常，一切都被删除了，但是它会让我错误（当我试图删除带有广告的城镇时）在控制台中并停留在重定向上。这是错误：

（node：10200）UnhandledPromiseRejectionWarning：未处理的承诺拒绝（拒绝ID：1）：CastError：强制转换为ObjectId，值为＃34;城镇＆＃34;在路径＆＃34; _id＆＃34;对于模特＆＃34; Town＆＃34; （node：10200）DeprecationWarning：不推荐使用未处理的拒绝承诺。将来，未处理的承诺拒绝将使用非零退出代码终止Node.js进程。

Answer 1

问题在于重定向路径。它应该像else范围中的那个：

            res.redirect('/');

Mongoose Express.js删除具有关系的对象

1 个答案: