MongoDB 未找到数据：returns 未定义

Question

我有一个名为 'account' 的数据模型，它存储 'user'

var mongoose=require("mongoose");

mongoose.connect("mongodb://localhost/dataseed");

var db=mongoose.connection;

var accountSchema=mongoose.Schema({
     user:{
      type:mongoose.Schema.Types.ObjectId,
      ref:"user"
    },
    accountholder:{
        type:String
    },
    cvv:{
        type:String
    },
    expiryyear:{
    type:String
    },
    expirymonth:{
    type:String
    },
    accountnumber:{
        type:Number
    },
    currentamount:{
        type:Number
    },
    transferedamount:{
        type:Number
    },
    withdrawnamount:{
        type:Number    
    }
});

var account = module.exports = mongoose.model('account', accountSchema);

当我尝试使用 account.find() 函数查找帐户时。但是，当我尝试访问 account.accountnumber

时，它 returns 未定义

我正在查询我的模型如下：

data.findById({"_id":req.params.id},function(err,data){

        console.log("DATA.USER --------------------------------------------------");
        console.log(data.user);

        if(err)console.log(err);
        else{
              acessToken.create({user:req.user,data:req.params.id,token:token},function(err,acess){
                  if(err)console.log(err);
                  else{
                      console.log("ACCESSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSss");
                        console.log(acess.user);
                        transporter.sendMail(mailOptions, function(error, info){
                          if (error) {
                              console.log(error);
                          }
                          else
                          {
                            console.log("------------------------------------------------------------------------------------TYPE OF USER ID: " + typeof(req.user._id));
                            account.find({"user":req.user},function(err,d){
                              if(err)console.log(err)

                                    var amount=d.currentamount-data.price;
                                    var transferedamount=d.transferedamount+data.price;
                                    console.log("Amount: "+amount); // NaN

                                account.findByIdAndUpdate({user:req.user},{currentamount:amount,transferedamount:transferedamount},function(err,update){
                                  if(err)console.log(err);
                                    console.log('Email sent: ' + info.response);



                                    //getUsername of seller

                                    // console.log(data.user)
                                    user.findById({"_id":data.user},function(err,seller){
                                        if(err){
                                        console.log(err);
                                        }else{

                                          var buyer = req.user.username;
                                          var seller = seller.username;
                                          var priceOfData = data.price;
                                          //ccNumber undefined
                                          var ccnumber = d.accountnumber;


                                        console.log("Buyer Name " +buyer);
                                        console.log("Seller Name " +seller);
                                         console.log("Price " +priceOfData);
                                        console.log("Purchased on Credit Card Number " +ccnumber);


                                            res.render('buyer/sold.ejs');

                                        }
                                      });
                                  });
                              });
                          }
                      });
                    }
              });
          }
        });

模型 "data" 和 "acessToken" 用于查找产品并生成购买产品的访问令牌。

这是我在控制台上得到的输出。

5ca9ae4c044bab18588edf5b
ACCESSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSss
5cd4cc83c3c65514c61ae4f3
------------------------------------------------------------------------------------TYPE OF USER ID: object
Amount: NaN
{ CastError: Cast to ObjectId failed for value "{ user: 5cd4cc83c3c65514c61ae4f3 }" at path "_id" for model "account"
    at MongooseError.CastError (/home/ubuntu/workspace/DataSeed/node_modules/mongoose/lib/error/cast.js:29:11)
    at ObjectId.cast (/home/ubuntu/workspace/DataSeed/node_modules/mongoose/lib/schema/objectid.js:232:11)
    at ObjectId.SchemaType.applySetters (/home/ubuntu/workspace/DataSeed/node_modules/mongoose/lib/schematype.js:845:12)
    at ObjectId.SchemaType._castForQuery (/home/ubuntu/workspace/DataSeed/node_modules/mongoose/lib/schematype.js:1248:15)
    at ObjectId.SchemaType.castForQuery (/home/ubuntu/workspace/DataSeed/node_modules/mongoose/lib/schematype.js:1238:15)
    at ObjectId.SchemaType.castForQueryWrapper (/home/ubuntu/workspace/DataSeed/node_modules/mongoose/lib/schematype.js:1217:15)
    at cast (/home/ubuntu/workspace/DataSeed/node_modules/mongoose/lib/cast.js:252:34)
    at Query.cast (/home/ubuntu/workspace/DataSeed/node_modules/mongoose/lib/query.js:4334:12)
    at castQuery (/home/ubuntu/workspace/DataSeed/node_modules/mongoose/lib/query.js:4186:18)
    at Query._findAndModify (/home/ubuntu/workspace/DataSeed/node_modules/mongoose/lib/query.js:3203:23)
    at Query.<anonymous> (/home/ubuntu/workspace/DataSeed/node_modules/mongoose/lib/query.js:2830:8)
    at Query._wrappedThunk [as _findOneAndUpdate] (/home/ubuntu/workspace/DataSeed/node_modules/mongoose/lib/helpers/query/wrapThunk.js:16:8)
    at process.nextTick (/home/ubuntu/workspace/DataSeed/node_modules/kareem/index.js:369:33)
    at _combinedTickCallback (internal/process/next_tick.js:73:7)
    at process._tickCallback (internal/process/next_tick.js:104:9)
  message: 'Cast to ObjectId failed for value "{ user: 5cd4cc83c3c65514c61ae4f3 }" at path "_id" for model "account"',
  name: 'CastError',
  stringValue: '"{ user: 5cd4cc83c3c65514c61ae4f3 }"',
  kind: 'ObjectId',
  value: { user: 5cd4cc83c3c65514c61ae4f3 },
  path: '_id',
  reason: undefined,
  model: 
   { [Function: model]
     hooks: Kareem { _pres: [Object], _posts: [Object] },
     base: 
      Mongoose {
        connections: [Object],
        models: [Object],
        modelSchemas: [Object],
        options: [Object],
        _pluralize: [Function: pluralize],
        Schema: [Object],
        model: [Function],
        plugins: [Object] },
     modelName: 'account',
     model: [Function: model],
     db: 
      NativeConnection {
        base: [Object],
        collections: [Object],
        models: [Object],
        config: [Object],
        replica: false,
        options: null,
        otherDbs: [],
        relatedDbs: {},
        states: [Object],
        _readyState: 1,
        _closeCalled: false,
        _hasOpened: true,
        '$internalEmitter': [Object],
        _listening: false,
        _events: [Object],
        _eventsCount: 1,
        _connectionOptions: [Object],
        name: 'dataseed',
        host: 'localhost',
        port: 27017,
        user: undefined,
        pass: undefined,
        client: [Object],
        '$initialConnection': [Object],
        db: [Object] },
     discriminators: undefined,
     events: 
      EventEmitter {
        domain: null,
        _events: {},
        _eventsCount: 0,
        _maxListeners: undefined },
     '$appliedMethods': true,
     '$appliedHooks': true,
     _middleware: Kareem { _pres: [Object], _posts: [Object] },
     schema: 
      Schema {
        obj: [Object],
        paths: [Object],
        aliases: {},
        subpaths: {},
        virtuals: [Object],
        singleNestedPaths: {},
        nested: {},
        inherits: {},
        callQueue: [],
        _indexes: [],
        methods: {},
        methodOptions: {},
        statics: {},
        tree: [Object],
        query: {},
        childSchemas: [],
        plugins: [Object],
        '$id': 7,
        s: [Object],
        _userProvidedOptions: {},
        options: [Object],
        '$globalPluginsApplied': true,
        _requiredpaths: [] },
     collection: 
      NativeCollection {
        collection: [Object],
        opts: [Object],
        name: 'accounts',
        collectionName: 'accounts',
        conn: [Object],
        queue: [],
        buffer: false,
        emitter: [Object] },
     Query: { [Function] base: [Object] },
     '$__insertMany': [Function],
     '$init': Promise { [Object] },
     '$caught': true } }
Email sent: 250 2.0.0 OK  1557500841 d4sm5108746wrv.42 - gsmtp
Buyer Name murtaza1
Seller Name test1
Price 100
Purchased on Credit Card Number undefined

Answer 1

你的代码的问题是，当你查询你的数据库时，你还需要调用 MongoDB 公开的 populate 方法，特别是 Mongoose 我假设你用于查询数据库。有关 Mongoose docs 的更多信息。

为什么会这样？好吧，因为当 Mongoose 查询数据库时，您声明 using as a reference to your account Schema 它只 returns，没有 populate 方法，ID 该特定 account Schema 引用的文档。希望这对你有帮助，干杯，sigfried

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