OpenSlides/openslides/agenda/signals.py

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from django.apps import apps
from django.contrib.contenttypes.models import ContentType
from ..utils.auth import has_perm
from ..utils.autoupdate import inform_changed_data
from ..utils.collection import Collection
from .models import Item
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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.
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Do not run caching and autoupdate if the instance as an attribute
skip_autoupdate (regardless of its truthy or falsy conent).
"""
if hasattr(instance, 'get_agenda_title'):
if created:
# If the object is created, the related_object has to be sent again.
Item.objects.create(content_object=instance)
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if not hasattr(instance, 'skip_autoupdate'):
inform_changed_data(instance)
elif not hasattr(instance, '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'):
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_hidden_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_hidden_items')):
yield from agenda_app.get_startup_elements()
break
def required_users(sender, request_user, **kwargs):
"""
Returns all user ids that are displayed as speakers in any agenda item
if request_user can see the agenda. This function may return an empty
set.
"""
speakers = set()
if has_perm(request_user, 'agenda.can_see'):
for item_collection_element in Collection(Item.get_collection_string()).element_generator():
full_data = item_collection_element.get_full_data()
speakers.update(speaker['user_id'] for speaker in full_data['speakers'])
return speakers