riverpod-family

Original：🇺🇸 English

Translated

Use Riverpod family providers to pass parameters and cache per parameter; FutureProvider.family, NotifierProvider.family, autoDispose with family, overriding in tests. Use when fetching data by ID, pagination, or any provider that depends on a parameter. Use this skill when the user asks about family, provider parameters, or caching by ID.

2installs

Sourceserverpod/skills-registry

Added on2026-04-21

NPX Install

npx skill4agent add serverpod/skills-registry riverpod-family

SKILL.md Content

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Riverpod — Family

Instructions

Family lets a single provider have multiple independent states, one per parameter combination (like a Map from parameter to state). Use it for API calls that depend on an ID, query, or page number.

Creating a family (functional)

Add

.family

and an extra type parameter for the argument. The provider function receives

(ref, param)

:

dart

final userProvider = FutureProvider.autoDispose.family<User, String>((ref, id) async {
  final dio = Dio();
  final response = await dio.get('https://api.example.com/users/$id');
  return User.fromJson(response.data);
});

With code generation, add parameters to the function; the generated provider accepts arguments:

userProvider(id)

.

Creating a family (Notifier)

Use

NotifierProvider.family

/

AsyncNotifierProvider.family

(and

.autoDispose.family

). The Notifier must have a constructor that stores the parameter:

dart

final userProvider = AsyncNotifierProvider.autoDispose.family<UserNotifier, User, String>(
  UserNotifier.new,
);

class UserNotifier extends AsyncNotifier<User> {
  UserNotifier(this.id);
  final String id;

  @override
  Future<User> build() async {
    final dio = Dio();
    final response = await dio.get('https://api.example.com/users/$id');
    return User.fromJson(response.data);
  }
}

Using a family

Pass the parameter when watching or reading:

dart

final user = ref.watch(userProvider('123'));
final other = ref.watch(userProvider('456'));  // independent state

Parameters must have consistent == and hashCode. Do not use mutable or list/map literals as parameters (e.g.

ref.watch(myProvider([1,2,3]))

is wrong because

[1,2,3] != [1,2,3]

). Prefer primitives or custom classes with ==/hashCode. Enable riverpod_lint provider_parameters rule to catch mistakes.

Auto-dispose with family

Enable auto-dispose when using family so that when the parameter goes out of use (e.g. user navigates away), that parameter's state can be disposed and you avoid unbounded cache growth.

Overriding in tests

Override a single parameter: pass the same parameter to the override.
Override all parameters: override with a provider that ignores the parameter or returns a fixed value. See riverpod-overrides and the docs for exact syntax.

riverpod-family

NPX Install

Tags

SKILL.md Content

Riverpod — Family

Instructions

Creating a family (functional)

Creating a family (Notifier)

Using a family

Auto-dispose with family

Overriding in tests