Waiting for multiple blocs

[payam-zahedi]

Hi @felangel , thanks for this awesome library.
I have the below situation:
imagine I have a Splash screen that waited for cart bloc and the favorite bloc.

• cart bloc is for taking user cart information.
• and the favorite bloc is about getting user favorite products.

I just want to get the cart information and the favorite products and if everything was ok push the user to the next screen. if some error received I want to show error and retry button.

I think MultiBlocBuilder would be great for this situation. but there is no MultiBlocBuilder.

can u give me a solution for that?

[felangel]

Hi @payam-zahedi 👋
Thanks for opening an issue!

Regarding MultiBlocBuilder, there was an issue for it and after multiple discussions we decided not to include it.

In your case you have several options:

• Nest BlocBuilders
• Create a new bloc which combines states from the other two
• Combine the states of the blocs using combineLatest and use a StreamBuilder to handle building the UI.

Hope that helps 👍

[payam-zahedi]

dear @felangel , thanks for your useful response.
if you have any resource or tutorial link, it would be very helpful for me.
thanks

[urusai88]

• Create a new bloc which combines states from the other two
• Combine the states of the blocs using combineLatest and use a StreamBuilder to handle building the UI.

Can we have some examples please?

[felangel]

@urusai88 I've created a sample gist. Please let me know if that helps 👍

[urusai88]

@felangel thanks you very much! It is what we need i think.
Can you also provide some examples for it please?:

Create a new bloc which combines states from the other two

[felangel]

@urusai88 no problem here's a sample gist which shows how you can composed streams within a bloc. In this case it's obviously a bit weird because the bloc is just a proxy but normally you'd execute some sort of logic/processing on the data from the streams and output a normalized view model for the UI to consume.

Hope that helps!