我是node.js的新手,所以这可能是一个愚蠢的错误。 我有一个像这样的mongodb架构:
seller_schema = mongoose.Schema({
name:String,
email:String,
trainers:[{ type: mongoose.Schema.Types.ObjectId, ref: 'trainers' }]
});
seller_collection=db.model('seller',seller_schema);
和trainer_collection是:
trainer_schema = mongoose.Schema({
trainer_fname:String,
trainer_lname:String,
trainer_photo:String
});
trainer_collection=db.model('trainers',trainer_schema);
我有一个将卖家添加到数据库的功能。培训师的数量因情况而异。所以,我在调用$push
函数之前实现.save
添加额外的培训师。
function createSeller(req, res){
var seller = new seller_collection({
name: req.query.first_name,
email:req.query.email
});
for(i=0;i<req.query.num_trainers;i++){
try{
var trainer_object={ "trainer_fname": req.query.trainer_fname,
"trainer_lname": req.query.trainer_lname,
"trainer_photo": req.query.trainer_photo
}
console.log(seller._id);
seller_collection.update({ _id: seller._id },{
$push: {
"trainers":trainer_object
}
},function(error,course){
console.log(error);
if(error){
res.status(500).json({
message: "failure",
status_code:"500",
error:error
});
}else{
res.status(200).json({
message: "success",
status_code:"200"
});
}
});
}catch(ex){
console.log(ex);
res.status(500).json({
message: "failure",
status_code:"500",
res:res
});
}
}
}
堆栈跟踪:
{ [CastError: Cast to undefined failed for value "[object Object]" at path "trainers"]
stack: 'Error\n at MongooseError.CastError (C:\\path\\node_modules\\mongoose\\lib\\error\\cast.js:18:16) at
SchemaArray.cast (C:\\path\\node_modules\\mongoose\\lib\\schema\\array.js:156:15) at SchemaArray.cast (C:\\path\\node_modules\\mongoose\\lib\\schema\\array.js:167:17) at Query._castUpdateVal (C:\\path\\node_modules\\mongoose\\lib\\query.js:2357:22)\n at Query._
walkUpdatePath (C:\\path\\node_modules\\mongoose\\lib\\query.js:2273:27) at Query._castUpdate (C:\\path\\node_modules\\mongoose\\lib\\query.js:2202:23)
at Query.update (C:\\path\\node_modules\\mongoose\\lib\\query.js:2035:22)\n at Function.update (C:\\path\\node_modules\\mongoose\\lib\\model.js:174
1:13) at createSeller (C:\path\\routes\\seller.js:269:31) at Query.<anonymous> (C:\\path\\routes\\seller.js:12:21) at C:\\path\\node_modules\\mongoose\\node_modules\\kareem\\index.js:177:19 at C:\\path\\node_modules\\mongoose\\node_modules\\kareem\\index.js:109:16 at process._tickCallback (node.js:355:11)',
message: 'Cast to undefined failed for value "[object Object]" at path "trainers"',
name: 'CastError',
kind: undefined,
value: [{"trainer_photo":"x"}],
path: 'trainers' }
答案 0 :(得分:2)
对于那些面临同样问题的人。
我更改了trainers:[trainer_schema]
这样的架构中的培训师字段
并将$push
方法编辑为seller.trainers.push(trainer_object);