如何在mongoose中推到数组

Question

我有这样的代码：

router.post('/setsuggestions', function(req, res, next){
  if(!req.body.username || !req.body.challengessuggestions){
    return res.status(400).json({message: challengessuggestions});
  }

  var query = { username: req.body.username };
  /*User.findOneAndUpdate(query, { challengessuggestions: req.body.challengessuggestions }, callback = function(response){
    res.json(response);
  });*/
/*
  User.findOneAndUpdate(
    query,
    {$push: {"challengessuggestions": {$oid: req.body.challengessuggestions}}},
    callback = function(response) {
        res.json(response);
    }
    );*/

  User.findOneAndUpdate(
    query,
    {$push: {challengessuggestions: req.body.challengessuggestions}},
    {safe: true, upsert: true},
    function(err, model) {
         res.json(err);
    }
);


});

当我这样做邮递员的时候：

我得到以下错误：

var UserSchema = new mongoose.Schema({
    username: { type: String, lowercase: true, unique: true },
    firstname: { type: String},
    lastname: { type: String},
    difficulty: { type: String},
    isstudent: { type: Boolean },
    haschildren: { type: Boolean},
    gender: { type: String },
    email: { type: String, unique: true},
    birthdate: String,
    isdoingchallenges: { type: Boolean },
    challengescompleted: [{ type: ObjectId, ref: 'Challenge' }],
    currentchallenge: { type: ObjectId, ref: 'Challenge' },
    challengessuggestions: [{ type: ObjectId, ref: 'Challenge' }],
    hash: String,
    salt: String
});

var Challengeschema = new mongoose.Schema({
    name: { type: String,  initial: true, required: true, index: true },
    image: { type: Array },
    difficulty: { type: String },
    studentfriendly: { type: Boolean },
    childfriendly: { type: Boolean },
    description: { type: String }
});

d:\stijn\documenten\eva-project-groep-6\api\node_modules\mongoose\lib\schema\obj ectid.js:134抛出新的CastError('objectid',value,this.path)；^Error at mongooseerror.casterror(d:\stijn\documenten\eva-project-groep-6\api\node_modules\mongoose\lib\Error\cast.js:18:16)at objectid.cast(d:\stijn\documenten\eva-project-groep-6\api\node_modules\mongoose\lib\rester\cast.js:134:13)at array.mongoosearray.mixin._cast searray.mixin._mapcast(D:\stijn\documenten\eva-project-groep-6\api\node_modules\mongoose\lib\types\array.js:295:17)在array.mongoosearray.mixin.push(D:\stijn\documenten\eva-project-groep-6\a pi\node_modules\mongoose\lib\types\array.js:308:25)在查询。(d:\stijn\documenten\eva-project-groep-6\api\routes\ind ex.js:144:44)在d:\stijn\documenten\eva-project-groep-6\api\node_modules\mongoose\node_modules\kareem\index.js:177:19在d:\stijn\document\eva-project-groep-6\api\node_modules\mongoose\node_modules\kareem\index.js:109:16在05:38-[nodemon]应用程序崩溃-在开始NG之前等待文件更改...

我怎么解决这个？

Answer 1

首先使用findone()查询用户，并使用第一个找到的传递给回调函数的文档保存嵌入的文档：

router.post('/setsuggestions', function(req, res, next){
    if(!req.body.username || !req.body.challengessuggestions){
        return res.status(400).json({message: challengessuggestions});
    }

    var query = { username: req.body.username };

    User.findOne(query, function (err, user){       
        if (err) //throw ...
        if (user) {
            if (user.challengessuggestions && user.challengessuggestions.length) {
                user.challengessuggestions.push(req.body.challengessuggestions);
            }
            else {
                user.challengessuggestions = [req.body.challengessuggestions];
            }

            // save changes
            user.save(function (err) {
                if (!err) {
                    // done ...
                }
            });
        }
    });    
);