如何在mongodb中的文档数组中查找元素？

Question

我有如下代码。

router.get('/Child_Profile/:SchoolId/:childId',function(req,res,next){
childModel.find({"schoolid":req.params.SchoolId,"students[]":req.params.ChildId}, function (err, result) {       
        if (err) 
            {
            return console.log(err);
        }
    res.json(result);
        });
  });

防爆系列

{
"schoolid":"1wer",
"students":["121","232"],
"profilepic":"http://wed"
}

当我使用schoolid和studentid查找学生信息时，上述架构仅使用schoolid而不是Studentid查找。 提前致谢

Answer 1

您已将students as an array - students[] -students students as an array - students[] ，仅使用students并传递studentid的值，查询将返回结果。

Mongo shell query for the collection

{
        "_id" : ObjectId("59e9cfd4f4896dbabfc15f45"),
        "schoolid" : "1wer",
        "students" : [
                "121",
                "232"
        ],
        "profilepic" : "http://wed"
}

db.collection.find({students:"121"});

修改后的查询

router.get('/Child_Profile/:SchoolId/:childId',function(req,res,next){
childModel.find({"schoolid":req.params.SchoolId,"students":req.params.ChildId}, function (err, result) {       
        if (err) 
            {
            return console.log(err);
        }
    res.json(result);
        });
  });