Sub containers

Sub containers with additional services

In some cases, you want to register services or parameters only for a specific service. The services or parameters should not be placed inside the global service container. To solve this problem, you can use the enhance method, which accepts an array of additional services and a map of additional parameters. These are only available in the returned ServiceContainer.

void main() {
  var container = ServiceContainer();

  var newContainer = container.enhance(
    parameters: {
      'foo': 'overwritten',
    },
    services: [
      // Important: Specify the type explicitly or cast the outer array to dynamic. Otherwise dart can not infer the
      // correct return type!
      LazyServiceDescriptor<MySelfRegisteredService>(
            (p) => MySelfRegisteredService(p.resolve(), p.parameters['foo']),
        const Service(exposeAs: SelfRegisteredService),
      ),
    ],
  );

  var mySvc = newContainer.resolve<SelfRegisteredService>();
  expect(mySvc.foo, equals('overwritten'));
}