I am developing a Flutter application using Bloc pattern. After success authentication, UserSate has User object. In all other Blocs, I need to access User object in UserState. I tried with getting UserBloc on other Bloc's constructor parameters and accessing User object. But it shows that User object is null. Anyone have a better solution?
class SectorHomeBloc extends Bloc<SectorHomeEvent, SectorHomeState> {
final OutletRepository outletRepository;
UserBloc userBloc;
final ProductRepository productRepository;
final ProductSubCategoryRepository productSubCategoryRepository;
final PromotionRepository promotionRepository;
final ProductMainCategoryRepository mainCategoryRepository;
SectorHomeBloc({
@required this.outletRepository,
@required this.userBloc,
@required this.productSubCategoryRepository,
@required this.productRepository,
@required this.promotionRepository,
@required this.mainCategoryRepository,
});
@override
SectorHomeState get initialState => SectorHomeLoadingState();
@override
Stream<SectorHomeState> mapEventToState(SectorHomeEvent event) async* {
try {
print(userBloc.state.toString());
LatLng _location = LatLng(
userBloc.state.user.defaultLocation.coordinate.latitude,
userBloc.state.user.defaultLocation.coordinate.longitude);
String _token = userBloc.state.user.token;
if (event is GetAllDataEvent) {
yield SectorHomeLoadingState();
List<Outlet> _previousOrderedOutlets =
await outletRepository.getPreviousOrderedOutlets(
_token, _location, event.orderType, event.sectorId);
List<Outlet> _featuredOutlets =
await outletRepository.getFeaturedOutlets(
_token, _location, event.orderType, event.sectorId);
List<Outlet> _nearestOutlets = await outletRepository.getOutletsNearYou(
_token, _location, event.orderType, event.sectorId);
List<Product> _newProducts = await productRepository.getNewItems(
_token, _location, event.orderType, event.sectorId);
List<Product> _trendingProducts =
await productRepository.getTrendingItems(
_token, _location, event.orderType, event.sectorId);
List<Promotion> _promotions = await promotionRepository
.getVendorPromotions(_token, event.sectorId);
yield SectorHomeState(
previousOrderedOutlets: _previousOrderedOutlets,
featuredOutlets: _featuredOutlets,
nearByOutlets: _nearestOutlets,
newItems: _newProducts,
trendingItems: _trendingProducts,
promotions: _promotions,
);
}
} on SocketException {
yield SectorHomeLoadingErrorState('could not connect to server');
} catch (e) {
print(e);
yield SectorHomeLoadingErrorState('Error');
}
}
}
The print statement [print(userBloc.state.toString());] in mapEventToState method shows the initial state of UserSate. But, at the time of this code executing UserState is in UserLoggedInState.
UPDATE (Best Practice): please refer to the answer here so the best way for that is to hear the changes of another bloc inside the widget you are in, and fire the event based on that. so what you will do is wrap your widget in a bloc listener and listen to the bloc you want.
the lovely thing about listener is that you can listen anywhere to any bloc and do whatever you want here is the official documentation for it
OLD WAY (NOT Recommended)
there is an official way to do this as in the documentation, called Bloc-to-Bloc Communication and here is the example for this as in the documentation
sorry for the late update for this answer and thanks to @MJ studio