使用Mongoose Node.js过滤MongoDB数据库

如何解决使用Mongoose Node.js过滤MongoDB数据库

我需要根据一些固定条件过滤一些用户。我有一个 user 集合和一个 talent 集合。人才收藏包含对主类别收藏的引用。

我需要根据人才集合中的类别和用户集合中的某些键来过滤这些用户。

For example I need to search for a user whose gender is 'male' and education 'BTech' and will have talents as a programmer and tester

我的用户集合就像

{
    "_id": "5f1939239bd35429ac9cd78f","isOtpVerified": "false","role": "user","adminApproved": 1,"status": 0,"languages": "Malayalam,Tamil,Telugu,Kannada","name": "Test user","email": "[e-mail]","phone": "1234567890","otp": "480623","uid": 100015,"bio": "Short description from user","dob": "1951-09-07T00:00:00.000Z","gender": "Male","education": "Btech","bodyType": "","complexion": "","height": "","weight": "","requests": [],"location": {
        "place": "place","state": "state","country": "country"
    },"image": {
        "avatar": "5f1939239bd35429ac9cd78f_avatar.jpeg","fullsize": "5f1939239bd35429ac9cd78f_fullsize.png","head_shot": "5f1939239bd35429ac9cd78f_head_shot.jpeg","left_profile": "5f1939239bd35429ac9cd78f_left_profile.png","right_profile": "5f1939239bd35429ac9cd78f_right_profile.png"
    },"__v": 42,"createdAt": "2020-07-23T07:15:47.387Z","updatedAt": "2020-08-18T18:54:22.272Z",}

人才收集

[
    {
        "_id": "5f38efef179aca47a0089667","userId": "5f1939239bd35429ac9cd78f","level": "5","chars": {
            "type": "Fresher",},"category": "5f19357b50bcf9158c6be572","media": [],"createdAt": "2020-08-16T08:35:59.692Z","updatedAt": "2020-08-16T08:35:59.692Z","__v": 0
    },{
        "_id": "5f3b7e6f7e322948ace30a2c","level": "3","category": "5f19359250bcf9158c6be573","media": [
            {
                "adminApproved": 0,"_id": "5f3c22573065f84a48e04a14","file": "id=5f1939239bd35429ac9cd78f&dir=test&img=5f1939239bd35429ac9cd78f_image_undefined.jpeg","description": "test","fileType": "image","caption": "test file"
            },{
                "adminApproved": 0,"_id": "5f3c2d7a8c7f8336b0bfced2","file": "id=5f1939239bd35429ac9cd78f&dir=test&img=5f1939239bd35429ac9cd78f_image_1.jpeg","description": "this is a demo poster for testing","caption": "A Test Poster"
            }
        ],"createdAt": "2020-08-18T07:08:31.532Z","updatedAt": "2020-08-18T19:35:22.899Z","__v": 2
    }
]

以上文档中的类别是一个单独的类别。类别集合为

[
        {
            "_id": "5f19359250bcf9158c6be573","status": true,"title": "Testing","description": "Application tester","code": "test","characteristics": [],"createdAt": "2020-07-23T07:00:34.221Z","updatedAt": "2020-07-23T07:00:34.221Z","__v": 0
        },{
            "status": true,"_id": "5f29829a705b4e648c28bc88","title": "Designer","description": "UI UX Designer","code": "uiux","createdAt": "2020-08-04T15:45:30.125Z","updatedAt": "2020-08-04T15:45:30.125Z",{
            "_id": "5f19357b50bcf9158c6be572","title": "programming","description": "Java programmer","code": "program","createdAt": "2020-07-23T07:00:11.137Z","updatedAt": "2020-07-23T07:00:11.137Z","__v": 0
        }
    ]

所以我的过滤条件将是

{
    categories: ["5f19359250bcf9158c6be573","5f19357b50bcf9158c6be572"],minAge: 18,maxAge: 25,minHeight: 5,maxHeight: 6,minWeight: 50,maxWeight: 80,complexion: "white",gender: "male",}

预期结果将是用户具有上述才能和条件，

{
    users: { ..User details.. },medias: { ...medias from the matching talents.. }
}

解决方法

如果有两个collections，则需要join或primary key来_id和前域，并且可以将$lookup与{{1 }进行过滤。 Documentation

,

您需要使用$lookup with pipeline，

• <td> @Html.ActionLink("Edit","Edit",new { /* id=item.PrimaryKey */ }) | @Html.ActionLink("Details","Details",new { /* id=item.PrimaryKey */ }) | @Html.ActionLink("Delete","Delete",new { /* id=item.PrimaryKey */ }) </td> ，您需要进行$match比赛
• category加入$lookup集合
  • users用户集合字段的条件
• $match排除未找到符合条件中传递的条件$match的文档

users

Playground