overrideWithBuild method

Override overrideWithBuild(RunNotifierBuild<NotifierT, Stream<ValueT>> build)

Override the provider with a new initialization function.

This will also disable the auto-scoping mechanism, meaning that if the overridden provider specified dependencies, it will have no effect.

The override must not specify a dependencies.

Some common use-cases are:

• testing, by replacing a service with a fake implementation, or to reach a very specific state easily.
• multiple environments, by changing the implementation of a class based on the platform or other parameters.

This function should be used in combination with ProviderScope.overrides or ProviderContainer.overrides:

final myService = Provider((ref) => MyService());

runApp(
  ProviderScope(
    overrides: [
      // Replace the implementation of the provider with a different one
      myService.overrideWith((ref) {
        ref.watch('other');
        return MyFakeService(),
      })),
    ],
    child: MyApp(),
  ),
);

Implementation

Override overrideWithBuild(RunNotifierBuild<NotifierT, CreatedT> build) {
  return $FamilyOverride(
    from: this,
    createElement: (pointer) {
      final provider =
          pointer.origin
              as $ClassProvider<NotifierT, StateT, ValueT, CreatedT>;

      return provider
          .$view(runNotifierBuildOverride: build)
          .$createElement(pointer);
    },
  );
}