mongodb - how to get limited number of items from array - reactjs

Question

is it possible somehow to get limited number of items from array?
For now I just can get whoole users data, but I want to have a pagination, where I can load limited number of tasks from users data
async getUserTasks( _id, _limit ) {
try {
await UserModel.find( {
_id: _id,
"tasks": { $size: _limit }
} );
} catch ( e ) {
console.log( e );
}
}
enter image description here

Answer 1

Use limit to cap the number of documents that can be returned from a read operation. limit functions as a cap on the maximum number of documents that the operation can return, but the operation can return a smaller number of documents if there are not enough documents present to reach the limit. If limit is used with the skip method, the skip applies first and the limit only applies to the documents left over after the skip.
Follow the instructions in the examples below to insert data into a collection and return only certain results from a query using a sort, a skip, and a limit. Consider the following collection of documents that describe books:
[
{ "_id": 1, "name": "The Brothers Karamazov", "author": "Dostoyevsky", "length": 824 },
{ "_id": 2, "name": "Les Misérables", "author": "Hugo", "length": 1462 },
{ "_id": 3, "name": "Atlas Shrugged", "author": "Rand", "length": 1088 },
{ "_id": 4, "name": "Infinite Jest", "author": "Wallace", "length": 1104 },
{ "_id": 5, "name": "Cryptonomicon", "author": "Stephenson", "length": 918 },
{ "_id": 6, "name": "A Dance With Dragons", "author": "Tolkein", "length": 1104 },
]
Limit
The following example queries the collection to return the top three longest books. It matches all the documents with the query, applies a sort on the length field to return books with longer lengths before books, and applies a limit to return only 3 results:
// define an empty query document
const query = {};
// sort in descending (-1) order by length
const cursor = collection.find(query).sort({ length: -1 }).limit(3);
await cursor.forEach(console.dir);
The code example above outputs the following three documents, sorted by length:
{ "_id": 2, "title": "Les Misérables", "author": "Hugo", "length": 1462 }
{ "_id": 6, "title": "A Dance With Dragons", "author": "Martin", "length": 1104 }
{ "_id": 4, "title": "Infinite Jest", "author": "Wallace", "length": 1104 }