不同标准的猫鼬聚合计数

Question

我有用户和用户拥有文档。用户最多可以有100个文档。用户只能编辑最多50个文件。当我插入新文档时，首先查询User.documents以查找文档数量，然后使用userId和isFinished=true查询文档，并检查是否有可编辑文档的空间。有没有办法通过单个查询获取用户的total和finished文档？我目前的代码如下所示。

var UserSchema = mongoose.Schema({ 
    email: {type: String, index: {unique: true, sparse: true}}, 
    password: String, 
    }); 

    UserSchema.virtual('documents',{ 
    ref: 'Document', 
    localField:'_id', 
    foreignField:'owner' 
}); 


var DocumentSchema = mongoose.Schema({ 
    owner : { type:mongoose.Schema.Types.ObjectId, ref: 'User' }, 
    name: String, 
    data: String, 
    isFinished: { 
     type: Boolean, default: false 
    }, 
    updateDate: Date 
    }); 


User.findOne({_id: req.userId}).populate('documents').exec(function(err, user) { 

// user.documents == total user documents 

if (user.documents && user.documents.length < 100) { 

    Document.count({owner:req.userId,isFinished:true},function(err,count) { 
    // count == finished user documents 
     if (count < 50) { 

      // do something 
     } 


     }) 
    } 
}) 

Answer 1

我想我已经解决了聚合问题。

Document.aggregate([ 
    { 
     $match: { 
      owner:user._id 
     }}, 
    { $group: { 
     "_id": "$owner", 
     "totalCount": { 
      $sum: 1 
     }, 
     "finishedCount" : { $sum: { $cond: ["$isFinished",1,0]} } 
    } 
    }]).exec(function (err,result) { 
    if (result && result.length > 0) { 
     if (result[0].totalCount >= config.registeredTotalLimit) { 
      // Registered total limit is reached 
      console.log('Register registeredTotalLimit'); 
     } 
     if (result[0].finishedCount >= config.registeredActiveLimit) { 
      // Registered active limit is reached 
      console.log('Register registeredActiveLimit'); 
     } 
    }