OpenSlides/openslides/mediafiles/signals.py

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from django.apps import apps
def get_permission_change_data(sender, permissions=None, **kwargs):
"""
Yields all necessary collections if 'mediafiles.can_see' permission changes.
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"""
mediafiles_app = apps.get_app_config(app_label='mediafiles')
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for permission in permissions:
# There could be only one 'mediafiles.can_see' and then we want to return data.
if permission.content_type.app_label == mediafiles_app.label and permission.codename == 'can_see':
yield from mediafiles_app.get_startup_elements()