猫鼬-通过部分匹配另一个数组来基于对象数组字段查找文档

Question

So, I`ll send to my api the following array format

['apple', 'orange', 'mango', 'kiwi', 'lemon']

In my database, I have a collection called Recipes having the following field format

ingredients: [ { .., name: 'apple', .. }, { .., name: 'orange', .. }] - being an array of objects with this kind of format

Having the following documents in my DB:

Document #1

ingredients:[ {.., name: 'apple', ..}, {.., name: 'kiwi', ..}, {.., name: 'banana', ..}]

Document #2

ingredients:[ {.., name: 'apple', ..}, {.., name: 'orange', ..}, {.., name: 'kiwi', ..}]

Document #3

ingredients:[ {.., name: 'lemon', ..}, {.., name: 'tomato', ..}, {.., name: 'potato', ..}]

How the mongoose query should look like to return Document#2, Document#1, Document#3(this order as their arrays are the most similar to initial requested array)

Answer 1

You can use below aggregation:

db.collection.aggregate([
    {
        $addFields: {
            totalMatch: {
                $size: {
                    $setIntersection: [['apple', 'orange', 'mango', 'kiwi', 'lemon'], { $map: { input: "$ingredients", as: "ingredient", in: "$$ingredient.name" } }]
                }
            }
        }
    },
    {
        $sort: {
            totalMatch: -1
        }
    },
    {
        $project: {
            totalMatch: 0
        }
    }
])

All you need is to add additional field which counts all matching ingredients (using $setIntersection ) and then sort by that field in descending order. Since your ingredients contains objects you can use $map to retrieve only names.