show errors on multiple instances or missing init #1151
Merged
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Show an error for an invalid pattern which worked by accident but stopped in version 3. The user creates multiple extension instances, usually in different modules or during tests, rather than importing a single instance. If they fail to call
init_app
on one, the extension can't find the app in its engine registry. Or if they callinit_app
on both they can end up with conflicting sessions.