javascript - Mongoose 查询 - 删除以子文档值为条件的文档

Question

我正在尝试删除“挑战”集合中的文档，但前提是用户位于具有管理员 Angular 色的该挑战的参与者列表中。

我当前的代码记录挑战已删除，但挑战实际上并​​未删除。

这是挑战模式:

var challengeSchema = mongoose.Schema({
    name : {type: String, required: true},
    description : {type: String, required: true},
    startDate: {type: Date, required: true},
    endDate: {type: Date, required: true},
    creationDate: {type: Date, required: true},
    goalType : {type: String, required: true},
    goalAmount: {type: Number, required: true},
    participants : {type : [], required: true},
    categories : {type: [String], required: true}
});

下面是当前的查询尝试，其中 Challenge 是模型变量:

    Challenge.findOne({"_id" : req.params.challengeId, "participant" : {
        $elemMatch : {participantID : req.user.id, participantRole : "admin"}
    }}).remove(function(err, challenge){
        if (err){
            console.log(err);
            res.redirect('/user/dashboard');
        }
        if (!challenge){
            console.log("no challenge found");
            res.redirect('/user/dashboard');
        }
        else {
            console.log("challenge deleted");
            res.redirect('/user/dashboard');
        }
    })

Answer 1

使用 findOneAndRemove 而不是 findOne。像这样:

Challenge.findOneAndRemove({"_id" : req.params.challengeId, "participant" : {
    $elemMatch : {participantID : req.user.id, participantRole : "admin"}
}},function(err, challenge){
    if (err){
        console.log(err);
        res.redirect('/user/dashboard');
    }
    if (!challenge){
        console.log("no challenge found");
        res.redirect('/user/dashboard');
    }
    else {
        console.log("challenge deleted");
        res.redirect('/user/dashboard');
    }
})