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- from functools import partial
-
- from django.db.models.utils import make_model_tuple
- from django.dispatch import Signal
-
- class_prepared = Signal()
-
-
- class ModelSignal(Signal):
- """
- Signal subclass that allows the sender to be lazily specified as a string
- of the `app_label.ModelName` form.
- """
-
- def _lazy_method(self, method, apps, receiver, sender, **kwargs):
- from django.db.models.options import Options
-
- # This partial takes a single optional argument named "sender".
- partial_method = partial(method, receiver, **kwargs)
- if isinstance(sender, str):
- apps = apps or Options.default_apps
- apps.lazy_model_operation(partial_method, make_model_tuple(sender))
- else:
- return partial_method(sender)
-
- def connect(self, receiver, sender=None, weak=True, dispatch_uid=None, apps=None):
- self._lazy_method(
- super().connect,
- apps,
- receiver,
- sender,
- weak=weak,
- dispatch_uid=dispatch_uid,
- )
-
- def disconnect(self, receiver=None, sender=None, dispatch_uid=None, apps=None):
- return self._lazy_method(
- super().disconnect, apps, receiver, sender, dispatch_uid=dispatch_uid
- )
-
-
- pre_init = ModelSignal(use_caching=True)
- post_init = ModelSignal(use_caching=True)
-
- pre_save = ModelSignal(use_caching=True)
- post_save = ModelSignal(use_caching=True)
-
- pre_delete = ModelSignal(use_caching=True)
- post_delete = ModelSignal(use_caching=True)
-
- m2m_changed = ModelSignal(use_caching=True)
-
- pre_migrate = Signal()
- post_migrate = Signal()
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