Cache in GrapghQl Flutter package settings and how to check it works - flutter

Question

I'm trying to implement graphQl Flutter package in my app.
https://github.com/zino-app/graphql-flutter
Everything works well, but I have some issues with cache.
If we ran example from this package https://github.com/zino-app/graphql-flutter/tree/master/packages/graphql_flutter/example we can see that cache doesn't work.
In my app I also can't increase speed, it always get data online.
The code from this example
class GraphQLWidgetScreen extends StatelessWidget {
const GraphQLWidgetScreen() : super();
#override
Widget build(BuildContext context) {
final HttpLink httpLink = HttpLink(
uri: 'https://api.github.com/graphql',
);
final AuthLink authLink = AuthLink(
// ignore: undefined_identifier
getToken: () async => 'Bearer $YOUR_TOKEN',
);
Link link = authLink.concat(httpLink);
if (ENABLE_WEBSOCKETS) {
final WebSocketLink websocketLink = WebSocketLink(
url: 'ws://localhost:8080/ws/graphql',
config: SocketClientConfig(
autoReconnect: true, inactivityTimeout: Duration(seconds: 15)),
);
link = link.concat(websocketLink);
}
final ValueNotifier<GraphQLClient> client = ValueNotifier<GraphQLClient>(
GraphQLClient(
cache: OptimisticCache(
dataIdFromObject: typenameDataIdFromObject,
),
link: link,
),
);
return GraphQLProvider(
client: client,
child: const CacheProvider(
child: MyHomePage(title: 'GraphQL Widget'),
),
);
}
}
Animation that shows that cache doesn't work
So, the question is - what is the right way to implement cache and how check it works.
Thank you!

Answer 1

The examples are meant to be standalone - as such they use separate clients and caches. The consequence of this is that it is re-instantiated every mount. In other words, every time you navigates to the example's route, you get a new cache, so you can't see the caching effects. For a more substantial example where you can see if the cache is working, see the starwars example (related github discussion)