Method __init__

django/db/migrations/state.py:629–663

(self, real_apps, models, ignore_swappable=False)

    """

    def __init__(self, real_apps, models, ignore_swappable=False):
        # Any apps in self.real_apps should have all their models included
        # in the render. We don't use the original model instances as there
        # are some variables that refer to the Apps object.
        # FKs/M2Ms from real apps are also not included as they just
        # mess things up with partial states (due to lack of dependencies)
        self.real_models = []
        for app_label in real_apps:
            app = global_apps.get_app_config(app_label)
            for model in app.get_models():
                self.real_models.append(ModelState.from_model(model, exclude_rels=True))
        # Populate the app registry with a stub for each application.
        app_labels = {model_state.app_label for model_state in models.values()}
        app_configs = [
            AppConfigStub(label) for label in sorted([*real_apps, *app_labels])
        ]
        super().__init__(app_configs)

        # These locks get in the way of copying as implemented in clone(),
        # which is called whenever Django duplicates a StateApps before
        # updating it.
        self._lock = None
        self.ready_event = None

        self.render_multiple([*models.values(), *self.real_models])

        # There shouldn't be any operations pending at this point.
        from django.core.checks.model_checks import _check_lazy_references

        ignore = (
            {make_model_tuple(settings.AUTH_USER_MODEL)} if ignore_swappable else set()
        )
        errors = _check_lazy_references(self, ignore=ignore)
        if errors:
            raise ValueError("\n".join(error.msg for error in errors))

    @contextmanager
    def bulk_update(self):