如何在mongodb中使用组或桶？

Question

我的数据看起来像：

如何按专业安排和分组数据。

我试过这样，但结果却是差异。格式。

var data = db.collection('hms').aggregate([
    { $match: { speciality: doctorSpeciality } },
    { $project: { doctor: 1, speciality: 1, meetting_hours: 1, hospital:1 } },
    {
        $group: {
            "_id": "$doctor_speciality",
            "speciality": {$push:"$speciality"},
            "doctor":{$push :"$doctorSpeciality"},
            "hospital":{$push : "$hospital_name" },
            "meetting_hours":{$push: "$meetting_hours"}
        }
    }
]);
data.toArray(function(err, doc){
    console.log("result :::" ,doc);
}); 

我想要这样的格式：

0:[
   { doctor:Hussain,speciality:Physician,hospital:HMS,date:2018-2-1},
   { doctor:Hussain,speciality:Physician,hospital:HMS,date:2018-2-2}
 ],
1: [{doctor:Reza,speciality:Physician,hospital:HMS,date:2018-2-1}]

等等。

我正在使用MongoClient驱动程序。

有人可以帮助我或给我一些提示吗？

Answer 1

您只需要调整以立即推送所有值，而不是一次推送一个字段。

尝试

db.collection('hms').aggregate([
  {"$match":{"speciality":doctorSpeciality}},
  {"$project":{"doctor":1,"speciality":1,"meetting_hours":1,"hospital":1}},
  {"$group":{
    "_id":"$doctor_speciality",
    "data":{
      "$push":{
        "speciality":"$speciality",
        "doctor":"$doctor_speciality",
        "hospital":"$hospital_name",
        "meetting_hours":"$meetting_hours"
      }
    }
  }}
])