validateData<ResultType, Item> method

ResultType? validateData<ResultType, Item>(ApiResponse<ResultType, Item> response)

Returns the body to cache, or null when it should not be cached.

Guards against storing an empty collection, which would otherwise be served back as a valid (but useless) cache hit.

Implementation

ResultType? validateData<ResultType, Item>(
  ApiResponse<ResultType, Item> response,
) {
  final data = response.body;
  // Checked on the value: `ResultType is Iterable<Item>` compares a type
  // argument against a type and is always false, so it never guarded
  // anything.
  if (data is Iterable && data.isEmpty) return null;
  return data;
}