2016-03-30 16:34:44 +08:00
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from functools import partial
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from django.db.models.utils import make_model_tuple
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2008-08-06 23:32:46 +08:00
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from django.dispatch import Signal
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2013-11-05 12:11:51 +08:00
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2006-05-02 09:31:56 +08:00
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2008-08-06 23:32:46 +08:00
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class_prepared = Signal(providing_args=["class"])
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2006-05-02 09:31:56 +08:00
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2013-11-05 12:11:51 +08:00
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class ModelSignal(Signal):
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"""
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Signal subclass that allows the sender to be lazily specified as a string
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of the `app_label.ModelName` form.
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"""
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2016-03-30 16:34:44 +08:00
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def connect(self, receiver, sender=None, weak=True, dispatch_uid=None, apps=None):
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# Takes a single optional argument named "sender"
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connect = partial(super(ModelSignal, self).connect, receiver, weak=weak, dispatch_uid=dispatch_uid)
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models = [make_model_tuple(sender)] if sender else []
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if not apps:
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from django.db.models.base import Options
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apps = sender._meta.apps if hasattr(sender, '_meta') else Options.default_apps
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apps.lazy_model_operation(connect, *models)
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2013-11-05 12:11:51 +08:00
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2006-05-02 09:31:56 +08:00
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2013-11-05 12:11:51 +08:00
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pre_init = ModelSignal(providing_args=["instance", "args", "kwargs"], use_caching=True)
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post_init = ModelSignal(providing_args=["instance"], use_caching=True)
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pre_save = ModelSignal(providing_args=["instance", "raw", "using", "update_fields"],
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use_caching=True)
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post_save = ModelSignal(providing_args=["instance", "raw", "created", "using", "update_fields"], use_caching=True)
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pre_delete = ModelSignal(providing_args=["instance", "using"], use_caching=True)
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post_delete = ModelSignal(providing_args=["instance", "using"], use_caching=True)
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2014-09-04 20:15:09 +08:00
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m2m_changed = ModelSignal(
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providing_args=["action", "instance", "reverse", "model", "pk_set", "using"],
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use_caching=True,
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)
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2008-08-06 23:32:46 +08:00
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2016-05-13 23:58:54 +08:00
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pre_migrate = Signal(providing_args=["app_config", "verbosity", "interactive", "using", "apps", "plan"])
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post_migrate = Signal(providing_args=["app_config", "verbosity", "interactive", "using", "apps", "plan"])
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