mutate method
Implementation
Future<bool> mutate(MutationMutateCallback<R> callback,
{bool append = false}) async {
if (_attachCount > 0) {
final data = callback();
await tryMutate(data, append: append);
return true;
} else {
if (append) {
_mutateCallback = null;
_mutateAppendCallback = callback;
} else {
_mutateCallback = callback;
_mutateAppendCallback = null;
}
}
return false;
}