如何檢查貓鼬對象ref是否包含匹配的字段？

Question

我不知道這是做正確或有效的爲此事......我需要看用戶是否另一個用戶的追隨者中找到/以下...

下面是代碼：

var User = new Schema({ 

firstName: {type: String}, 
lastName: {type: String}, 
following: [{ type: ObjectId, ref: 'User' }] 

......}); 



var userId2 = someoneElse; 


var userId = req.query.userId; 
     User.findOne(userId, function(err, results) { 
       if(err) { 
         throw err; 

       } else { 
         var i, newArrayF1, newArrayF2, biggerArraySize; 
         newArrayF1 = results.completedChallenges; 
         newArrayF2 = results.joinedChallenges; 

         if(newArrayF2.length > newArrayF1.length) { 
           biggerArraySize = newArrayF2.length; 
         } else { 
           biggerArraySize = newArrayF1.length; 
         } 
         for(i =0, i < biggerArraySize, i++) { 
           if(newArrayF1[i].followers.indexOf(userId2)) { 
             var obj = {mtype: 2}; 
           res.json(obj); 
           } 

           if(newArrayF2[i].following.indexOf(userId2)) { 
             var obj = {mtype: 1}; 
           res.json(obj); 
           } 

         } 

         if(i == biggerArraySize) { 
           var obj = {mtype: 0}; 
           res.json(obj); 
         } 

       } 

     }); 

我開始檢查，看是否有用戶與其他用戶跟隨/跟隨連接，並返回一個整數，它同夥，

Answer 1

那麼你可以獲取用戶時使用populate。

User.findOne(userId).populate('following').exec(function (err, user) { 
    user.following.forEach(function (person) { 
      // here you have access to each person in the array 
    } 
}