Query help

Summary: The developer is asking for help on how to find the common elements between two documents in a collection, specifically for an attribute that is a string array containing IDs. Solution: To find the mutual part (common elements) between two documents in a collection, both containing a string array attribute with IDs, you can use the following approach: 1. Retrieve both documents from the collection. 2. Access the "ids" attribute in each document. 3. Convert the string arrays into sets for easy comparison. 4. Use the intersection operation to find the common elements between the two sets. 5. Convert the resulting set back to an array if