Mongoose find exactly match 100% with properties of object - express

Question

i am using mongoose currently for my project and i using mongoose find to query document that fit 100% exactly with what i define in the object. This is my router define:
router.get('/warned-students/:classname/:schoolYear/:semester', get_warned_students)
this is the link i typed:
http://localhost:5000/students/warned-students/k61caclc1/2016/1
as you can see, it received 3 params classname, schoolYear and semester. classname is k61clc1, choolYear is 2016 and semester is 1.
and this is my controller
const Student = require('../models/student')
exports.get_warned_students = (req, res, next) => {
const { classname, schoolYear, semester } = req.params
Student.find({
classname,
'accademicTrainningList.schoolYear': schoolYear,
'accademicTrainningList.semester': semester,
'accademicTrainningList.classification': 'Weak'
})
.exec()
.then(students => {
res.status(200).json({ size: students.length, students })
})
.catch(err => {
console.log('error in finding warned students')
res.status(500).json({ err })
})
}
it worked, but not return what i expected:
{
"size": 14,
"students": [
{
"gender": "No Record",
"profileImage": "https://kittyinpink.co.uk/wp-content/uploads/2016/12/facebook-default-photo-male_1-1.jpg",
"_id": "5f603a126d633e75884e9e1b",
"fullname": "Trịnh Phan Anh ",
"birthday": "19/09/1997 ",
"classname": "k61caclc1",
"code": "16020508",
"vnumail": "16020508#vnu.edu.vn",
"accademicTrainningList": [
{
"semester": "1",
"classification": "Good",
"_id": "5f603a126d633e75884e9dc0",
"score": 80,
"schoolYear": "2016"
},
{
"semester": "2",
"classification": "Weak",
"_id": "5f603b1f3bd07d5cb4d6fea9",
"score": 53,
"schoolYear": "2016"
}
],
"scoreList": [],
"receiveScholarship": [],
"prizeList": [],
"scienceContestPrizeList": [],
"wentAbroad": [],
"tookTheTest": [],
"punishList": [],
"__v": 0
},
{
"gender": "No Record",
"profileImage": "https://kittyinpink.co.uk/wp-content/uploads/2016/12/facebook-default-photo-male_1-1.jpg",
"_id": "5f603a126d633e75884e9e1e",
"fullname": "Đinh Việt Cường ",
"birthday": "13/03/1996 ",
"classname": "k61caclc1",
"code": "16022255",
"vnumail": "16022255#vnu.edu.vn",
"accademicTrainningList": [
{
"semester": "1",
"classification": "Good",
"_id": "5f603a126d633e75884e9dc3",
"score": 80,
"schoolYear": "2016"
},
{
"semester": "2",
"classification": "Weak",
"_id": "5f603b1f3bd07d5cb4d6feac",
"score": 56,
"schoolYear": "2016"
}
],
"scoreList": [],
"receiveScholarship": [],
"prizeList": [],
"scienceContestPrizeList": [],
"wentAbroad": [],
"tookTheTest": [],
"punishList": [],
"__v": 0
},
{
"gender": "No Record",
"profileImage": "https://kittyinpink.co.uk/wp-content/uploads/2016/12/facebook-default-photo-male_1-1.jpg",
"_id": "5f603a126d633e75884e9e23",
"fullname": "Phạm Duy ",
"birthday": "17/12/1998 ",
"classname": "k61caclc1",
"code": "16020542",
"vnumail": "16020542#vnu.edu.vn",
"accademicTrainningList": [
{
"semester": "1",
"classification": "Excellent",
"_id": "5f603a126d633e75884e9dc8",
"score": 90,
"schoolYear": "2016"
},
{
"semester": "2",
"classification": "Weak",
"_id": "5f603b1f3bd07d5cb4d6feb1",
"score": 56,
"schoolYear": "2016"
}
],
"scoreList": [],
"receiveScholarship": [],
"prizeList": [],
"scienceContestPrizeList": [],
"wentAbroad": [],
"tookTheTest": [],
"punishList": [],
"__v": 0
},
{
"gender": "No Record",
"profileImage": "https://kittyinpink.co.uk/wp-content/uploads/2016/12/facebook-default-photo-male_1-1.jpg",
"_id": "5f603a126d633e75884e9e26",
"fullname": "Đặng Ngọc Đam ",
"birthday": "26/11/1998 ",
"classname": "k61caclc1",
"code": "16020518",
"vnumail": "16020518#vnu.edu.vn",
"accademicTrainningList": [
{
"semester": "1",
"classification": "Good",
"_id": "5f603a126d633e75884e9dcb",
"score": 80,
"schoolYear": "2016"
},
{
"semester": "2",
"classification": "Weak",
"_id": "5f603b1f3bd07d5cb4d6feb4",
"score": 55,
"schoolYear": "2016"
}
],
"scoreList": [],
"receiveScholarship": [],
"prizeList": [],
"scienceContestPrizeList": [],
"wentAbroad": [],
"tookTheTest": [],
"punishList": [],
"__v": 0
},
{
"gender": "No Record",
"profileImage": "https://kittyinpink.co.uk/wp-content/uploads/2016/12/facebook-default-photo-male_1-1.jpg",
"_id": "5f603a126d633e75884e9e28",
"fullname": "Nguyễn Hải Đăng ",
"birthday": "09/08/1998 ",
"classname": "k61caclc1",
"code": "16020520",
"vnumail": "16020520#vnu.edu.vn",
"accademicTrainningList": [
{
"semester": "1",
"classification": "Good",
"_id": "5f603a126d633e75884e9dcd",
"score": 80,
"schoolYear": "2016"
},
{
"semester": "2",
"classification": "Weak",
"_id": "5f603b1f3bd07d5cb4d6feb6",
"score": 56,
"schoolYear": "2016"
}
],
"scoreList": [],
"receiveScholarship": [],
"prizeList": [],
"scienceContestPrizeList": [],
"wentAbroad": [],
"tookTheTest": [],
"punishList": [],
"__v": 0
},
{
"gender": "No Record",
"profileImage": "https://kittyinpink.co.uk/wp-content/uploads/2016/12/facebook-default-photo-male_1-1.jpg",
"_id": "5f603a126d633e75884e9e29",
"fullname": "Nguyễn Hải Đăng ",
"birthday": "24/11/1998 ",
"classname": "k61caclc1",
"code": "16020519",
"vnumail": "16020519#vnu.edu.vn",
"accademicTrainningList": [
{
"semester": "1",
"classification": "Excellent",
"_id": "5f603a126d633e75884e9dce",
"score": 90,
"schoolYear": "2016"
},
{
"semester": "2",
"classification": "Weak",
"_id": "5f603b1f3bd07d5cb4d6feb7",
"score": 54,
"schoolYear": "2016"
}
],
"scoreList": [],
"receiveScholarship": [],
"prizeList": [],
"scienceContestPrizeList": [],
"wentAbroad": [],
"tookTheTest": [],
"punishList": [],
"__v": 0
},
{
"gender": "No Record",
"profileImage": "https://kittyinpink.co.uk/wp-content/uploads/2016/12/facebook-default-photo-male_1-1.jpg",
"_id": "5f603a126d633e75884e9e2b",
"fullname": "Đỗ Hồng Giang ",
"birthday": "29/01/1997 ",
"classname": "k61caclc1",
"code": "16020544",
"vnumail": "16020544#vnu.edu.vn",
"accademicTrainningList": [
{
"semester": "1",
"classification": "Good",
"_id": "5f603a126d633e75884e9dd0",
"score": 80,
"schoolYear": "2016"
},
{
"semester": "2",
"classification": "Weak",
"_id": "5f603b1f3bd07d5cb4d6feb9",
"score": 57,
"schoolYear": "2016"
}
],
"scoreList": [],
"receiveScholarship": [],
"prizeList": [],
"scienceContestPrizeList": [],
"wentAbroad": [],
"tookTheTest": [],
"punishList": [],
"__v": 0
},
{
"gender": "No Record",
"profileImage": "https://kittyinpink.co.uk/wp-content/uploads/2016/12/facebook-default-photo-male_1-1.jpg",
"_id": "5f603a126d633e75884e9e36",
"fullname": "Phạm Minh Hiếu ",
"birthday": "17/10/1998 ",
"classname": "k61caclc1",
"code": "16020373",
"vnumail": "16020373#vnu.edu.vn",
"accademicTrainningList": [
{
"semester": "1",
"classification": "Good",
"_id": "5f603a126d633e75884e9ddb",
"score": 80,
"schoolYear": "2016"
},
{
"semester": "2",
"classification": "Weak",
"_id": "5f603b1f3bd07d5cb4d6fec4",
"score": 55,
"schoolYear": "2016"
}
],
"scoreList": [],
"receiveScholarship": [],
"prizeList": [],
"scienceContestPrizeList": [],
"wentAbroad": [],
"tookTheTest": [],
"punishList": [],
"__v": 0
},
{
"gender": "No Record",
"profileImage": "https://kittyinpink.co.uk/wp-content/uploads/2016/12/facebook-default-photo-male_1-1.jpg",
"_id": "5f603a126d633e75884e9e38",
"fullname": "Nguyễn Ngọc Hòa ",
"birthday": "29/04/1997 ",
"classname": "k61caclc1",
"code": "16020566",
"vnumail": "16020566#vnu.edu.vn",
"accademicTrainningList": [
{
"semester": "1",
"classification": "Good",
"_id": "5f603a126d633e75884e9ddd",
"score": 80,
"schoolYear": "2016"
},
{
"semester": "2",
"classification": "Weak",
"_id": "5f603b1f3bd07d5cb4d6fec6",
"score": 57,
"schoolYear": "2016"
}
],
"scoreList": [],
"receiveScholarship": [],
"prizeList": [],
"scienceContestPrizeList": [],
"wentAbroad": [],
"tookTheTest": [],
"punishList": [],
"__v": 0
},
{
"gender": "No Record",
"profileImage": "https://kittyinpink.co.uk/wp-content/uploads/2016/12/facebook-default-photo-male_1-1.jpg",
"_id": "5f603a126d633e75884e9e3b",
"fullname": "Trần Hữu Hoàn ",
"birthday": "25/11/1998 ",
"classname": "k61caclc1",
"code": "16022471",
"vnumail": "16022471#vnu.edu.vn",
"accademicTrainningList": [
{
"semester": "1",
"classification": "Good",
"_id": "5f603a126d633e75884e9de0",
"score": 80,
"schoolYear": "2016"
},
{
"semester": "2",
"classification": "Weak",
"_id": "5f603b1f3bd07d5cb4d6fec9",
"score": 59,
"schoolYear": "2016"
}
],
"scoreList": [],
"receiveScholarship": [],
"prizeList": [],
"scienceContestPrizeList": [],
"wentAbroad": [],
"tookTheTest": [],
"punishList": [],
"__v": 0
},
{
"gender": "No Record",
"profileImage": "https://kittyinpink.co.uk/wp-content/uploads/2016/12/facebook-default-photo-male_1-1.jpg",
"_id": "5f603a126d633e75884e9e3e",
"fullname": "Nguyễn Tấn Hoàng ",
"birthday": "06/01/1998 ",
"classname": "k61caclc1",
"code": "16022261",
"vnumail": "16022261#vnu.edu.vn",
"accademicTrainningList": [
{
"semester": "1",
"classification": "Good",
"_id": "5f603a126d633e75884e9de3",
"score": 80,
"schoolYear": "2016"
},
{
"semester": "2",
"classification": "Weak",
"_id": "5f603b1f3bd07d5cb4d6fecc",
"score": 50,
"schoolYear": "2016"
}
],
"scoreList": [],
"receiveScholarship": [],
"prizeList": [],
"scienceContestPrizeList": [],
"wentAbroad": [],
"tookTheTest": [],
"punishList": [],
"__v": 0
},
{
"gender": "No Record",
"profileImage": "https://kittyinpink.co.uk/wp-content/uploads/2016/12/facebook-default-photo-male_1-1.jpg",
"_id": "5f603a126d633e75884e9e47",
"fullname": "Nguyễn Trung Kiên ",
"birthday": "18/09/1998 ",
"classname": "k61caclc1",
"code": "16020588",
"vnumail": "16020588#vnu.edu.vn",
"accademicTrainningList": [
{
"semester": "1",
"classification": "Intermediate",
"_id": "5f603a126d633e75884e9dec",
"score": 75,
"schoolYear": "2016"
},
{
"semester": "2",
"classification": "Weak",
"_id": "5f603b1f3bd07d5cb4d6fed5",
"score": 55,
"schoolYear": "2016"
}
],
"scoreList": [],
"receiveScholarship": [],
"prizeList": [],
"scienceContestPrizeList": [],
"wentAbroad": [],
"tookTheTest": [],
"punishList": [],
"__v": 0
},
{
"gender": "No Record",
"profileImage": "https://kittyinpink.co.uk/wp-content/uploads/2016/12/facebook-default-photo-male_1-1.jpg",
"_id": "5f603a126d633e75884e9e52",
"fullname": "Nguyễn Văn Mạnh ",
"birthday": "07/07/1998 ",
"classname": "k61caclc1",
"code": "16020606",
"vnumail": "16020606#vnu.edu.vn",
"accademicTrainningList": [
{
"semester": "1",
"classification": "Good",
"_id": "5f603a126d633e75884e9df7",
"score": 80,
"schoolYear": "2016"
},
{
"semester": "2",
"classification": "Weak",
"_id": "5f603b1f3bd07d5cb4d6fee0",
"score": 59,
"schoolYear": "2016"
}
],
"scoreList": [],
"receiveScholarship": [],
"prizeList": [],
"scienceContestPrizeList": [],
"wentAbroad": [],
"tookTheTest": [],
"punishList": [],
"__v": 0
},
{
"gender": "No Record",
"profileImage": "https://kittyinpink.co.uk/wp-content/uploads/2016/12/facebook-default-photo-male_1-1.jpg",
"_id": "5f603a126d633e75884e9e60",
"fullname": "Tạ Văn Quỳnh ",
"birthday": "06/12/1998 ",
"classname": "k61caclc1",
"code": "16020637",
"vnumail": "16020637#vnu.edu.vn",
"accademicTrainningList": [
{
"semester": "1",
"classification": "Good",
"_id": "5f603a126d633e75884e9e05",
"score": 80,
"schoolYear": "2016"
},
{
"semester": "2",
"classification": "Weak",
"_id": "5f603b1f3bd07d5cb4d6feee",
"score": 59,
"schoolYear": "2016"
}
],
"scoreList": [],
"receiveScholarship": [],
"prizeList": [],
"scienceContestPrizeList": [],
"wentAbroad": [],
"tookTheTest": [],
"punishList": [],
"__v": 0
}
]
}
As you can see it returns results containing 1 of 3 properties but what I want is it returns only results containing all 3 properties. Thanks for helping me, have a nice day
Update:
this is what i expected: the array "accademicTrainningList" contains an element that fit all 3 property schoolYear: 2016, semester: 1 and classification: weak
{
"gender": "No Record",
"profileImage": "https://kittyinpink.co.uk/wp-content/uploads/2016/12/facebook-default-photo-male_1-1.jpg",
"_id": "5f603a126d633e75884e9e1b",
"fullname": "Trịnh Phan Anh ",
"birthday": "19/09/1997 ",
"classname": "k61caclc1",
"code": "16020508",
"vnumail": "16020508#vnu.edu.vn",
"accademicTrainningList": [
{
"semester": "1",
"classification": "Weak",
"_id": "5f603a126d633e75884e9dc0",
"score": 53,
"schoolYear": "2016"
},
{
"semester": "2",
"classification": "Good",
"_id": "5f603b1f3bd07d5cb4d6fea9",
"score": 80,
"schoolYear": "2016"
}
],
"scoreList": [],
"receiveScholarship": [],
"prizeList": [],
"scienceContestPrizeList": [],
"wentAbroad": [],
"tookTheTest": [],
"punishList": [],
"__v": 0
},
or else, if nothing match it return an empty array

Answer 1

It looks like $elemMatch is what you need. In your case, the query would be something like:
Student.find({
classname: "k61caclc1",
accademicTrainningList: {
$elemMatch: {
semester: "1",
schoolYear: "2016",
classification: "Weak"
}
}
})
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