fetcher abstract method

Future<Iterable<T>?> fetcher(
  1. Q? target,
  2. int pageNo
)

Implementation of your data acquisition.

This SHOULD NOT throw error. (you SHOULD handle errors yourself in your implementation)

Returns Iterable<T> on success, null on failure.

Implementation

Future<Iterable<T>?> fetcher(Q? target, int pageNo);