Question

我有用户和用户都有文件。用户最多可以有100个文档。用户最多只能编辑50个文档。当我插入一个新文档时，首先我查询User.documents以查找文档数，然后我使用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

我想我已经用聚合解决了这个问题。

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');
        }
    }

Mongoose聚合计数与不同的标准

1 个答案: