build method

  1. @override
FutureOr<void> build(
  1. BuildTrigger trigger
)
override

Recalculates the state of the repository.

This method is called when:

Override this method to handle changes from said repositories.

Example:

class MyRepository extends Repository<MyState> {
  final OtherRepository _otherRepository;

  MyRepository(this._otherRepository) : super(MyState.new) {
    watch(_otherRepository);
  }

  @override
  FutureOr<void> build(BuildTrigger trigger) async {
    if(trigger is InitialBuildTrigger) {
      // Do something when the repository is first initialized
    }

    if(trigger is UpdateTrigger) {
      // Do something when the repository is updated
    }

    if(trigger is OtherRepository) {
      // Do something when the other repository emits a new state
    }
  }
}

Implementation

@override
FutureOr<void> build(BuildTrigger trigger) async {
  if (!_courses.state.hasData || !_tasks.state.hasData) return;

  final courses = _courses.state.requireData;
  final tasks = _tasks.state.requireData;

  data(
    Map.fromEntries(
      courses.map(
        (course) => MapEntry(
          course.id,
          TaskAggregate.fromTasks(
            tasks.where((task) => task.courseId == course.id),
          ),
        ),
      ),
    ),
  );
}