mongoose.js CastError:对于路径"未定义"的值"[object Object]",转换为数字失败

Question

使用Mongoose.js带node.js.

我有这个架构:

var Photo = new Schema({
     URL:String
    ,description:String
    ,created_by:{type:ObjectId, ref:'User'}
    ,created_at:{type:Date, default:Date.now()}
});

var User = new Schema({
    name:{type:String,index:true}
    ,email:{type:String,index:true, unique:true}
});

//Task model                                                                                                                                                                                       
var Task = new Schema({
    title:String
   ,created_by:{type:ObjectId, ref: 'User'}
   ,created:{type:Date, default:Date.now()}
   ,responses:[{
       type:Number
      ,user:{type:ObjectId, ref: 'User'}
       ,comment:String
       ,avatarURL:String
       ,photo:{type:ObjectId, ref: 'Photo'}
      ,created:{type:Date, default:Date.now()}
   }]
});

//Group model                                                                                                                                                                                      
var Group = new Schema({
     name:String
    ,tasks:[Task]
});

并且这个代码错误输出(组很好,idx上的任务很好,响应是一个空数组,用户有效,照片有效):

var typePhoto = 6;
 var resp = {
      type: typePhoto//photo                                                                                                                                                 
      ,user: user._id
      ,photo: photo._id
 };


 group.tasks[taskIdx].responses.push(resp); //errors out here

那时我得到以下错误:

/home/admin/notitws/node_modules/mongoose/lib/utils.js:434
        throw err;
              ^
CastError: Cast to number failed for value "[object Object]" at path "undefined"
    at SchemaNumber.cast (/home/admin/notitws/node_modules/mongoose/lib/schema/number.js:127:9)
    at Array.MongooseArray._cast (/home/admin/notitws/node_modules/mongoose/lib/types/array.js:78:15)
    at Object.map (native)
    at Array.MongooseArray.push (/home/admin/notitws/node_modules/mongoose/lib/types/array.js:187:23)
    at exports.taskAddPhoto (/home/admin/notitws/routes/group.js:1097:35)
    at Promise.exports.createPhoto (/home/admin/notitws/routes/photos.js:106:4)
    at Promise.addBack (/home/admin/notitws/node_modules/mongoose/lib/promise.js:128:8)
    at Promise.EventEmitter.emit (events.js:96:17)
    at Promise.emit (/home/admin/notitws/node_modules/mongoose/lib/promise.js:66:38)
    at Promise.complete (/home/admin/notitws/node_modules/mongoose/lib/promise.js:77:20)

关于如何解决这个或可能导致它的原因的任何想法？

PS不知道它的问题,但在调用get我填充组tasks.responses.user和tasks.responses.photo和tasks.created_by.

Answer 1

mongoose使用"type"关键字来确定字段的类型.Mongoose可能认为响应是Number类型而不是数组.

尝试:

responses:[{
   type: {type: Number}
   ,user:{type:ObjectId, ref: 'User'}
   ,comment:String
   ,avatarURL:String
   ,photo:{type:ObjectId, ref: 'Photo'}
   ,created:{type:Date, default:Date.now()}
}]

另一种方法是将响应对象包装到模式中:

responses: [Response]