Python django.db.models.signals.post_delete.connect() Examples

def _connect(self):
        """
        Connect the signal listing.
        """

        # this is used to capture the current state for the model
        post_init.connect(
            self.post_init_receiver, sender=self.model_cls, dispatch_uid=id(self)
        )

        post_save.connect(
            self.post_save_receiver, sender=self.model_cls, dispatch_uid=id(self)
        )

        post_delete.connect(
            self.post_delete_receiver, sender=self.model_cls, dispatch_uid=id(self)
        ) 

def ready(self):
        from .signals.datasample.pre_save import data_sample_pre_save

        from .signals.algo.post_delete import algo_post_delete
        from .signals.objective.post_delete import objective_post_delete
        from .signals.datasample.post_delete import data_sample_post_delete
        from .signals.datamanager.post_delete import datamanager_post_delete
        from .signals.model.post_delete import model_post_delete

        # registering signals with the model's string label
        from substrapp.models import Algo, Objective, DataSample, DataManager, Model

        pre_save.connect(data_sample_pre_save, sender=DataSample)

        post_delete.connect(algo_post_delete, sender=Algo)
        post_delete.connect(objective_post_delete, sender=Objective)
        post_delete.connect(data_sample_post_delete, sender=DataSample)
        post_delete.connect(datamanager_post_delete, sender=DataManager)
        post_delete.connect(model_post_delete, sender=Model) 

def contribute_to_class(self, cls, name, *args, **kwargs):
        @classproperty
        def river(_self):
            return RiverObject(_self)

        self.field_name = name

        self._add_to_class(cls, self.field_name + "_transition_approvals",
                           GenericRelation('%s.%s' % (TransitionApproval._meta.app_label, TransitionApproval._meta.object_name)))
        self._add_to_class(cls, self.field_name + "_transitions", GenericRelation('%s.%s' % (Transition._meta.app_label, Transition._meta.object_name)))

        if id(cls) not in workflow_registry.workflows:
            self._add_to_class(cls, "river", river)

        super(StateField, self).contribute_to_class(cls, name, *args, **kwargs)

        if id(cls) not in workflow_registry.workflows:
            post_save.connect(_on_workflow_object_saved, self.model, False, dispatch_uid='%s_%s_riverstatefield_post' % (self.model, name))
            post_delete.connect(_on_workflow_object_deleted, self.model, False, dispatch_uid='%s_%s_riverstatefield_post' % (self.model, name))

        workflow_registry.add(self.field_name, cls) 

def connect_signals(self):
        """
        * m2m validation before templates are added/removed to a config
        * automatic vpn client management on m2m_changed
        * automatic vpn client removal
        """
        m2m_changed.connect(
            self.config_model.clean_templates,
            sender=self.config_model.templates.through,
        )
        m2m_changed.connect(
            self.config_model.templates_changed,
            sender=self.config_model.templates.through,
        )
        m2m_changed.connect(
            self.config_model.manage_vpn_clients,
            sender=self.config_model.templates.through,
        )
        post_delete.connect(
            self.vpnclient_model.post_delete, sender=self.vpnclient_model
        ) 

def test_page_delete_post(self):
        # Connect a mock signal handler to page_unpublished signal
        mock_handler = mock.MagicMock()
        page_unpublished.connect(mock_handler)

        # Post
        response = self.client.post(reverse('wagtailadmin_pages:delete', args=(self.child_page.id, )))

        # Should be redirected to explorer page
        self.assertRedirects(response, reverse('wagtailadmin_explore', args=(self.root_page.id, )))

        # treebeard should report no consistency problems with the tree
        self.assertFalse(any(Page.find_problems()), 'treebeard found consistency problems')

        # Check that the page is gone
        self.assertEqual(Page.objects.filter(path__startswith=self.root_page.path, slug='hello-world').count(), 0)

        # Check that the page_unpublished signal was fired
        self.assertEqual(mock_handler.call_count, 1)
        mock_call = mock_handler.mock_calls[0][2]

        self.assertEqual(mock_call['sender'], self.child_page.specific_class)
        self.assertEqual(mock_call['instance'], self.child_page)
        self.assertIsInstance(mock_call['instance'], self.child_page.specific_class) 

def setup_delete_signals(model_list, generic_model):
    """
    Ensure that generic model instance is deleted if content object was.
    """
    def delete_content_object_handler(sender, instance, **kwargs):
        contenttype = ContentType.objects.get_for_model(instance)
        pk = instance.pk
        generic_model.objects\
                     .filter(content_type=contenttype, object_pk=pk)\
                     .delete()

    for model in model_list:
        post_delete.connect(
            delete_content_object_handler,
            '.'.join(model),
            weak=False
        ) 

def _connect(cls):
        """
        Connect signal to current model
        """
        pre_save.connect(
            notify_items_pre_save, sender=cls,
            dispatch_uid='knocker_pre_save_{0}'.format(cls.__name__)
        )
        post_save.connect(
            notify_items_post_save, sender=cls,
            dispatch_uid='knocker_post_save_{0}'.format(cls.__name__)
        )
        pre_delete.connect(
            notify_items_pre_delete, sender=cls,
            dispatch_uid='knocker_pre_delete_{0}'.format(cls.__name__)
        )
        post_delete.connect(
            notify_items_post_delete, sender=cls,
            dispatch_uid='knocker_post_delete_{0}'.format(cls.__name__)
        ) 

def setUp(self):
        from django.db.models.signals import post_save, post_delete
        try:
            from django.db.models.signals import post_migrate
        except ImportError:  # django <= 1.6
            from django.db.models.signals import post_syncdb as post_migrate

        from django_elasticsearch.models import es_save_callback
        from django_elasticsearch.models import es_delete_callback
        from django_elasticsearch.models import es_syncdb_callback
        try:
            from django.apps import apps
            app = apps.get_app_config('django_elasticsearch')
        except ImportError: # django 1.4
            from django.db.models import get_app
            app = get_app('django_elasticsearch')

        post_save.connect(es_save_callback)
        post_delete.connect(es_delete_callback)
        post_migrate.connect(es_syncdb_callback)
        
        if int(get_version()[2]) >= 6:
            sender = app
        else:
            sender = None
        post_migrate.send(sender=sender,
                          app_config=app,
                          app=app,  # django 1.4
                          created_models=[TestModel,],
                          verbosity=2)

        self.instance = TestModel.objects.create(username=u"1",
                                                 first_name=u"woot",
                                                 last_name=u"foo")
        self.instance.es.do_index() 

def ready(self):
        from c3nav.editor.models import ChangeSet
        from c3nav.editor.signals import set_changeset_author_on_login
        post_save.connect(ChangeSet.object_changed_handler)
        post_delete.connect(ChangeSet.object_changed_handler)
        m2m_changed.connect(ChangeSet.object_changed_handler)
        user_logged_in.connect(set_changeset_author_on_login) 

def register_signals():
    from c3nav.mapdata.models.geometry.base import GeometryMixin
    for model in get_submodels(GeometryMixin):
        post_delete.connect(geometry_deleted, sender=model)

    from c3nav.mapdata.models.locations import SpecificLocation
    for model in get_submodels(SpecificLocation):
        m2m_changed.connect(locationgroup_changed, sender=model.groups.through) 

def __init__(self):
        post_save.connect(self.user_model_updated, sender=DiscordUser)

        post_delete.connect(self.mapping_model_deleted, sender=RoleMapping)
        pre_save.connect(self.mapping_model_updated, sender=RoleMapping)

        pre_social_login.connect(self.social_account_updated)
        social_account_added.connect(self.social_account_updated)
        social_account_updated.connect(self.social_account_updated)
        social_account_removed.connect(self.social_account_removed)

        user_logged_in.connect(self.user_logged_in) 

def register_signal_handlers():
    post_save.connect(post_save_site_signal_handler, sender=Site)
    post_delete.connect(post_delete_site_signal_handler, sender=Site)

    pre_delete.connect(pre_delete_page_unpublish, sender=Page)
    post_delete.connect(post_delete_page_log_deletion, sender=Page) 

def register_signal_handlers():
    Document = get_document_model()
    post_delete.connect(post_delete_file_cleanup, sender=Document) 

def register_signal_handlers():
    Image = get_image_model()
    Rendition = Image.get_rendition_model()

    pre_save.connect(pre_save_image_feature_detection, sender=Image)
    post_delete.connect(post_delete_file_cleanup, sender=Image)
    post_delete.connect(post_delete_file_cleanup, sender=Rendition)
    post_delete.connect(post_delete_purge_rendition_cache, sender=Rendition) 

def register_signal_handlers():
    Image = get_image_model()
    Document = get_document_model()

    for model in get_page_models():
        page_published.connect(purge_page_from_cache, sender=model)
        page_unpublished.connect(purge_page_from_cache, sender=model)

    post_save.connect(purge_image_from_cache, sender=Image)
    post_delete.connect(purge_image_from_cache, sender=Image)
    post_save.connect(purge_document_from_cache, sender=Document)
    post_delete.connect(purge_document_from_cache, sender=Document) 

def test_page_delete_notlive_post(self):
        # Same as above, but this makes sure the page_unpublished signal is not fired
        # when if the page is not live when it is deleted

        # Unpublish the page
        self.child_page.live = False
        self.child_page.save()

        # Connect a mock signal handler to page_unpublished signal
        mock_handler = mock.MagicMock()
        page_unpublished.connect(mock_handler)

        # Post
        response = self.client.post(reverse('wagtailadmin_pages:delete', args=(self.child_page.id, )))

        # Should be redirected to explorer page
        self.assertRedirects(response, reverse('wagtailadmin_explore', args=(self.root_page.id, )))

        # treebeard should report no consistency problems with the tree
        self.assertFalse(any(Page.find_problems()), 'treebeard found consistency problems')

        # Check that the page is gone
        self.assertEqual(Page.objects.filter(path__startswith=self.root_page.path, slug='hello-world').count(), 0)

        # Check that the page_unpublished signal was not fired
        self.assertEqual(mock_handler.call_count, 0) 

def __init__(self):
        post_save.connect(invalidate_cache, sender=get_user_model())
        post_delete.connect(invalidate_cache, sender=get_user_model()) 

def bind_model(self, sender, **kwargs):
        if issubclass(sender, (Activity, )):
            post_save.connect(self.activity_created, sender=sender)
            post_delete.connect(self.activity_delete, sender=sender) 

def test_subpage_deletion(self):
        # Connect mock signal handlers to page_unpublished, pre_delete and post_delete signals
        unpublish_signals_received = []
        pre_delete_signals_received = []
        post_delete_signals_received = []

        def page_unpublished_handler(sender, instance, **kwargs):
            unpublish_signals_received.append((sender, instance.id))

        def pre_delete_handler(sender, instance, **kwargs):
            pre_delete_signals_received.append((sender, instance.id))

        def post_delete_handler(sender, instance, **kwargs):
            post_delete_signals_received.append((sender, instance.id))

        page_unpublished.connect(page_unpublished_handler)
        pre_delete.connect(pre_delete_handler)
        post_delete.connect(post_delete_handler)

        # Post
        response = self.client.post(reverse('wagtailadmin_pages:delete', args=(self.child_index.id, )))

        # Should be redirected to explorer page
        self.assertRedirects(response, reverse('wagtailadmin_explore', args=(self.root_page.id, )))

        # treebeard should report no consistency problems with the tree
        self.assertFalse(any(Page.find_problems()), 'treebeard found consistency problems')

        # Check that the page is gone
        self.assertFalse(StandardIndex.objects.filter(id=self.child_index.id).exists())
        self.assertFalse(Page.objects.filter(id=self.child_index.id).exists())

        # Check that the subpage is also gone
        self.assertFalse(StandardChild.objects.filter(id=self.grandchild_page.id).exists())
        self.assertFalse(Page.objects.filter(id=self.grandchild_page.id).exists())

        # Check that the signals were fired for both pages
        self.assertIn((StandardIndex, self.child_index.id), unpublish_signals_received)
        self.assertIn((StandardChild, self.grandchild_page.id), unpublish_signals_received)

        self.assertIn((StandardIndex, self.child_index.id), pre_delete_signals_received)
        self.assertIn((StandardChild, self.grandchild_page.id), pre_delete_signals_received)

        self.assertIn((StandardIndex, self.child_index.id), post_delete_signals_received)
        self.assertIn((StandardChild, self.grandchild_page.id), post_delete_signals_received)