Function count_docs_store

pub fn count_docs_store(
    caller: Principal,
    collection: CollectionKey,
    filter: &ListParams,
) -> Result<usize, String>

Count documents in a collection.

This function retrieves the count of documents from a collection’s store based on the specified parameters. It returns a Result<usize, String> where Ok(usize) contains the count of documents matching the filter criteria, or an error message as Err(String) if the operation encounters issues.

Parameters

• caller: The Principal representing the caller initiating the operation. If used in serverless functions, you can use ic_cdk::id() to pass an administrator controller.
• collection: A CollectionKey representing the collection from which to count the documents.
• filter: A reference to ListParams containing the filter criteria for counting the documents.

Returns

• Ok(usize): Contains the count of documents matching the filter criteria.
• Err(String): An error message if the operation fails.

This function counts documents in a Juno collection’s store by listing them and then determining the length of the result set.

Note

This implementation can be improved, as it currently relies on list_docs_store underneath, meaning that all documents matching the filter criteria are still read from the store. This might lead to unnecessary overhead, especially for large collections. Optimizing this function to count documents directly without retrieving them could enhance performance.