from django.apps import apps from django.contrib.contenttypes.models import ContentType from .models import Item from ..utils.autoupdate import inform_changed_data def listen_to_related_object_post_save(sender, instance, created, **kwargs): """ Receiver function to create agenda items. It is connected to the signal django.db.models.signals.post_save during app loading. The agenda_item_update_information container may have fields like type, parent_id, comment, duration, weight or skip_autoupdate. Do not run caching and autoupdate if the instance has a key skip_autoupdate in the agenda_item_update_information container. """ if hasattr(instance, "get_agenda_title_information"): if created: attrs = {} for attr in ("type", "parent_id", "comment", "duration", "weight"): if instance.agenda_item_update_information.get(attr): attrs[attr] = instance.agenda_item_update_information.get(attr) Item.objects.create(content_object=instance, **attrs) # If the object is created, the related_object has to be sent again. if not instance.agenda_item_update_information.get("skip_autoupdate"): inform_changed_data(instance) elif not instance.agenda_item_update_information.get("skip_autoupdate"): # If the object has changed, then also the agenda item has to be sent. inform_changed_data(instance.agenda_item) def listen_to_related_object_post_delete(sender, instance, **kwargs): """ Receiver function to delete agenda items. It is connected to the signal django.db.models.signals.post_delete during app loading. """ if hasattr(instance, "get_agenda_title_information"): content_type = ContentType.objects.get_for_model(instance) try: # Attention: This delete() call is also necessary to remove # respective active list of speakers projector elements. Item.objects.get(object_id=instance.pk, content_type=content_type).delete() except Item.DoesNotExist: # Item does not exist so we do not have to delete it. pass def get_permission_change_data(sender, permissions, **kwargs): """ Yields all necessary collections if 'agenda.can_see' or 'agenda.can_see_internal_items' permissions changes. """ agenda_app = apps.get_app_config(app_label="agenda") for permission in permissions: # There could be only one 'agenda.can_see' and then we want to return data. if ( permission.content_type.app_label == agenda_app.label and permission.codename in ("can_see", "can_see_internal_items") ): yield from agenda_app.get_startup_elements() break