votes up 1

Model class %s.%s doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS.

Package:
django
github stars 59414
Exception Class:
RuntimeError

Raise code

an application configuration to attach the model to.
        app_config = apps.get_containing_app_config(module)

        if getattr(meta, 'app_label', None) is None:
            if app_config is None:
                if not abstract:
                    raise RuntimeError(
                        "Model class %s.%s doesn't declare an explicit "
                        "app_label and isn't in an application in "
                        "INSTALLED_APPS." % (module, name)
                    )

            else:
                app_label = app_config.label

        new_class.a
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