How to find documents that their data match a condition on at least one item from a given array of items - mongoDB

Question

I want to fetch records that exists in provided dates array.

This provided array of dates will fetch records between start & end date.

Example:

I have this schema:

[
    {
        "_id": "1",
        "course": "Maths",
        "startDate": "2022-06-07",
        "endDate": "2022-06-12"
    },
    {
        "_id": "2",
        "course": "Chemistry",
        "startDate": "2022-06-06",
        "endDate": "2022-06-09"
    },
    {
        "_id": "3",
        "course": "Physics",
        "startDate": "2022-06-08",
        "endDate": "2022-06-10"
    },
    {
        "_id": "4",
        "course": "Computer Science",
        "startDate": "2022-06-10",
        "endDate": "2022-06-18"
    },
    {
        "_id": "5",
        "course": "Computer Science",
        "startDate": "2022-06-10",
        "endDate": "2022-06-13"
    },
    {
        "_id": "6",
        "course": "Biology",
        "startDate": "2022-06-08",
        "endDate": "2022-06-10"
    }
]

Provided array:

["2022-06-06", "2022-06-17"]

The expected response is:

[
    {
        "_id": "2",
        "course": "Chemistry",
        "startDate": "2022-06-06",
        "endDate": "2022-06-09"
    },
    {
        "_id": "4",
        "course": "Computer Science",
        "startDate": "2022-06-10",
        "endDate": "2022-06-18"
    }
]

Can anyone help me with the query? Thanks

Answer 1

You can use an aggregation pipeline with $filter :

1. Add the array of dates to the documents
2. Add a matchingDates field that counts the items in the dates array that matches the condition.
3. $match only documents that have such items.
4. Format

db.collection.aggregate([
  {$addFields: {dates: ["2022-06-06", "2022-06-17"]}},
  {
    $set: {
      matchingDates: {
        $size: {
          $filter: {
            input: "$dates",
            as: "item",
            cond: {
              $and: [
                {$gte: [{$toDate: "$$item"}, {$toDate: "$startDate"}]},
                {$lte: [{$toDate: "$$item"}, {$toDate: "$endDate"}]}
              ]
            }
          }
        }
      }
    }
  },
  {$match: {matchingDates: {$gt: 0}}},
  {$unset: ["dates", "matchingDates"]}
])

Playground example