How to use a provider inside of another provider in Flutter

Question

I want to create an app that has an authentication service with different permissions and functions (e.g. messages) depending on the user role.

So I create

Answer 1

It's simple: the first Provider provides an instance of a class, for example: LoginManager. The other Provides MessageFetcher. In MessageFetcher, whatever method you have, just add the Context parameter to it and call it by providing a fresh context.

Perhaps your code could look something like this:

MessageFetcher messageFetcher = Provider.of>(context).value;
String message = await messageFetcher.fetchMessage(context);

And in MessageFetcher you can have:

class MessageFetcher {
  Future fetchMessage(BuildContext context) {
    LoginManager loginManager = Provider.of>(context).value;
    loginManager.ensureLoggedIn();
    ///...
  }
}