getCountByFilter_ method Null safety

Future<int> getCountByFilter_(
  1. String? correlationId,
  2. String? filter
)

Gets a number of data items retrieved by a given filter.

This method shall be called by a public getCountByFilter method from child class that receives FilterParams and converts them into a filter function.

  • correlationId (optional) transaction id to trace execution through call chain.
  • filter (optional) a filter JSON object Return a number of objects that satifsy the filter.