Mutations
Define mutations as provider methods, monitor state avec MutationToken, et execute through ref.invoke(call).
Mutation Building Blocks
A mutation is a Call<R, State> returned de mutate(token, body, concurrency: ...).
Token
late final renameMut = mutation<void>(#rename)
Execution
await ref.invoke(provider.rename(...))
State
Idle / Pending / Success / Error via ref.watch(token)
Note
Unlike notifier.method() style APIs, miniriverpod makes mutation execution a first-class call object.
Execute a mutation
Use ref.invoke so cancellation et drop behaviors are surfaced ? the caller.
Run
await ref.invoke(userProvider.rename('Alice'));
Concurrency options
concurrent : run all calls in parallel (default).
queue : FIFO; keep running queued calls even after an error.
restart : cancel previous run, keep only latest call.
dropLatest : drop incoming calls while one is running.
exemple: optimistic update + restart
A common write pattern updates AsyncData optimistically, then syncs avec server response.
user_provider.dart
class UserProvider extends AsyncProvider<User?> {
UserProvider() : super.args(null);
late final renameMut = mutation<void>(#rename);
Call<void, AsyncValue<User?>> rename(String newName) => mutate(
renameMut,
(ref) async {
final cur = ref.watch(this).valueOrNull;
ref.state = AsyncData((cur ?? const User()).copyWith(name: newName), isRefreshing: true);
final api = ref.watch(apiProvider);
await api.rename(newName);
ref.state = AsyncData(await api.me());
},
concurrency: Concurrency.restart,
);
}
restart may throw CancelledMutation ? older callers.
dropLatest may throw DroppedMutation while busy.
Catch these dans UI when you want ? suppress transient cancellation errors.
?tapes suivantes
Flutter API
Bind mutation state ? UI using ConsumerWidget ou ConsumerStatefulWidget.
Open Flutter API