如何比较两个 arrays 并获得匹配的 output？

Question

In my collection I have a category array as below.

I receive another array to my API like below

array = ['Chess','Rugby'];

I want to add a condition to my database query such that catName field from category objects exists in array .

currently I'm using the below code to get the results:

postSchemaModel.aggregate([{
            "$geoNear": {
                "near": { "type": "Point", "coordinates": [parseFloat(long), parseFloat(lat), ] },
                "distanceField": "dist.calculated",
                "maxDistance": parseInt(maxDistance),
                "includeLocs": "dist.location",
                "spherical": true
            }
        },
        { "$match": { "$or": [{ "typology": "post" }, { "typology": "chat_group" }] } },
        {
            "$match": {
                "createdAt": {
                    "$gte": '2020-07-15 23:54:38.673665',
                    "$lt": '2020-06-15 23:54:38.673665'
                }
            }
        },
        { "$limit": limit },
        { "$skip": startIndex },
        { "$sort": { "createdAt": -1 } },
        {
            "$lookup": {
                "from": userSchemaModel.collection.name,
                "localField": "user_id",
                "foreignField": "_id",
                "as": "user_id"
            }
        },
        {
            "$project": {
                "post_data": 1,
                "likes": 1,
                "commentsCount": 1,
                "post_img": 1,
                "isUserLiked": 1,
                "usersLiked": 1,
                'exp_date': 1,
                "has_img": 1,
                "user_id": {
                    "img": "$user_id.img",
                    "_id": "$user_id._id",
                    "user_name": "$user_id.user_name",
                    "bday": "$user_id.bday",
                    "imagesource": "$user_id.imagesource",
                    "fb_url": "$user_id.fb_url",
                },
                "typology": 1,
                "geometry": 1,
                "category": 1,
                "created": 1,
                "createdAt": 1,
                "updatedAt": 1,
            }
        },
    ]).then(async function(posts) {
        //some code here
        }
    });

UPDATE: Sample Output

{
            "_id": "5f0bd1b7d6ed4f0017e5177c",
            "post_data": "bitch boy sudesh",
            "likes": 2,
            "commentsCount": 1,
            "post_img": null,
            "isUserLiked": true,
            "usersLiked": [
                "5f0bfa296ee76f0017f13787",
                "5ef60bba10e9090017e2c935"
            ],
            "exp_date": "2020-07-16T00:00:00.000Z",
            "has_img": false,
            "user_id": [
                {
                    "img": [
                        "default-user-profile-image.png"
                    ],
                    "_id": [
                        "5ef9a7a2922eba0017ce47e0"
                    ],
                    "user_name": [
                        "Sudesh"
                    ],
                    "bday": [
                        "1997-05-02T00:00:00.000Z"
                    ],
                    "imagesource": [
                        "fb"
                    ],
                    "fb_url": [
                        "https://platform-lookaside.fbsbx.com/platform/profilepic/?asid=1846836948784193&width=400&ext=1596011605&hash=AeRsB0QJQH7edpRT"
                    ]
                }
            ],
            "typology": "post",
            "geometry": {
                "pintype": "Point",
                "_id": "5f0bd1b7d6ed4f0017e5177d",
                "coordinates": [
                    79.9200017,
                    6.7088167
                ]
            },
            "category": [
                {
                    "_id": "5f0bd1b7d6ed4f0017e5177e",
                    "catID": "5eef80cc5de48230887f3aa8",
                    "catName": "Chess"
                },
                {
                    "_id": "5f0bd1b7d6ed4f0017e5177e",
                    "catID": "5eef80cc5de48230887f3aa8",
                    "catName": "Rugby"
                }
            ],
            "created": 1594610103626,
            "createdAt": "2020-07-13T03:15:03.629Z",
            "updatedAt": "2020-07-18T14:02:35.080Z"
        }

Answer 1

You can use some method if you only want to get true / false result:

category.some(element => array.includes(element.catName))

If you want to get an array of all the category objects with cat names that also exist in the array then you can filter method:

category.filter(element => array.includes(element.catName))

If you have an object called array in your code and you want to find at array of categories where cat names are in the array then you can add the condition to your $match stage:

  { "$match": { "$or": [{ "typology": "post" }, { "typology": "chat_group" }] }, "category.catName": { $in: array } }

Answer 2

Using another $match with "$elemMatch" solved the problem

"$match": {
                    "category": { "$elemMatch": { "catName": "Rugby", "catName": "Carrom" } },
                }