AsyncValue

As talked about before it has three different states data, loading, and error. So all of our code that previously used code that didn't have the AsyncValue type would now need to be changed and handle these cases. We use the .when method. IMPORTANT: If you were using version dev.7 of flutter_riverpod you also have to define the previous value. This can be used to display the previous value instead of for example a CircularProgressIndicator in some cases.

.When()

This method is super important to know and think of this as a replacement for the code you would have in either a StreamBuilder or a FutureBuilder. We don't have to manually make sure that we do all the correct if checks but instead get a clear compile error of what we are missing. So think of this as an easy way to just convert our AsyncValue to the three different states which are data, loading, and error.

The documentation on AsyncValue is great so I highly recommend reading it!

Exception handling

Currently, we don't do ANY exception handling. So you might see that if you would try the app in this current state with no internet connection an exception would be thrown and we wouldn't handle it. If you want to do simple error handling for now until the next module releases a simple try-catch statement in the controller would work just fine. In the catch statement for the controller, you would then just update the state with AsyncValue.error(someError).