flutter_query 0.3.7

Widgets that help state management of asynchronous operations such as sending HTTP requests, getting the response, and caching the result.

A Flutter package that is equivalent to the React Query library in the React ecosystem.

This package utilizes the power of Widgets in Flutter. As React Query provides its APIs with Hooks, flutter_query does it with Widgets.

Motivation

There are a variety of state management packages in Flutter, but those packages lack abstraction for common asynchronous operations.

Asynchronous operations are mostly used when communicating with remote APIs such as sending HTTP requests to servers.

These kind of operations lead to the repetitive state management pattern.

This package helps reducing this common pattern by providing high level state management APIs.

Usage

Wrap your app with the QueryClientProvider. The QueryClient is used to control the Querys in the app.

runApp(
  QueryClientProvider(
    create: (context) => QueryClient(),
    child: MyApp(),
  ),
);

Give an unique string to the id and a method to the fetcher that runs asynchronous operations.

The state is the type of QueryState. The QueryState has a QueryStatus that represents the current status of the operation.

QueryBuilder<String>(
  id: '1',
  fetcher: (id) async {
    final todoId = id;
    final todoTitle = getTodoTitleById(todoId);
    return todoTitle;
  },
  builder: (context, state, child) {
    switch(state.status) {
      case QueryStatus.idle:
        return Text('Ready to load data');
      case QueryStatus.fetching:
        return Text('Loading...');
      case QueryStatus.success:
        final todoTitle = state.data!;
        return Text(todoTitle);
      case QueryStatus.failure:
        return Text('Something went wrong...')
    }
  },
)