如何推送到猫鼬中的数组

Question

我有这个代码：

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);
    }
);


});

当我这样邮递员时：

我收到以下错误：

{ "name": "MongoError", "message": "异常：字段 'challengesuggestions' 必须是一个数组，但属于 OID 类型 文档 {_id: ObjectId('56263b910d1a2f1f0077ffae')}", "errmsg": “例外：字段 'challengesuggestions' 必须是一个数组，但 文档中的 OID 类型 {_id: ObjectId('56263b910d1a2f1f0077ffae')}", “代码”：16837，“确定”：0 }

这是 AppUser 的架构定义：

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
});

这是挑战的模式定义：

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 }
});

我在调用 api 的函数中发送这个：

对象{_id：“5631423f8c5ba50300f2b4f6”，难度：“中等”，名称： “Probeer 1 van onze recepten.”，__v：0，childfriendly: true…}

这给了我以下错误：

D:\Stijn\Documenten\EVA-project-Groep-6\Api\node_modules\mongoose\lib\schema\obj ectid.js:134 throw new CastError('ObjectId', value, this.path); ^ 错误 在 MongooseError.CastError (D:\Stijn\Documenten\EVA-project-Groep-6\Api\node _modules\mongoose\lib\error\cast.js:18:16) 在 ObjectId.cast (D:\Stijn\Documenten\EVA-project-Groep-6\Api\node_modules\m ongoose\lib\schema\objectid.js:134:13) 在 Array.MongooseArray.mixin._cast (D:\Stijn\Documenten\EVA-project-Groep-6\ Api\node_modules\mongoose\lib\types\array.js:124:32) 在 Array.MongooseArray.mixin._mapCast (D:\Stijn\Documenten\EVA-project-Groep -6\Api\node_modules\mongoose\lib\types\array.js:295:17) 在 Object.map （本机） 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_mo dules\kareem\index.js:177:19 在 D:\Stijn\Documenten\EVA-project-Groep-6\Api\node_modules\mongoose\node_mo dules\kareem\index.js:109:16 在 doNTCallback0 (node.js:408:9) 在 process._tickCallback (node.js:337:13) 10 月 29 日 22:05:38 - [nodemon] 应用程序崩溃 - 在启动之前等待文件更改...

我该如何解决这个问题？

Answer 1

首先使用 findOne() 查询用户用户，然后使用传递给回调的第一个找到的文档来保存嵌入的文档：

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 ...
                }
            });
        }
    });    
);