OpenSlides/openslides/topics/models.py

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from typing import Any, Dict
from django.contrib.contenttypes.fields import GenericRelation
from django.db import models
from ..agenda.models import Item
from ..core.models import Projector
from ..mediafiles.models import Mediafile
from ..utils.models import RESTModelMixin
from .access_permissions import TopicAccessPermissions
class TopicManager(models.Manager):
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"""
Customized model manager to support our get_full_queryset method.
"""
def get_full_queryset(self):
"""
Returns the normal queryset with all topics. In the background all
attachments and the related agenda item are prefetched from the
database.
"""
return self.get_queryset().prefetch_related('attachments', 'agenda_items')
class Topic(RESTModelMixin, models.Model):
"""
Model for slides with custom content. Used to be called custom slide.
"""
access_permissions = TopicAccessPermissions()
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objects = TopicManager()
title = models.CharField(max_length=256)
text = models.TextField(blank=True)
attachments = models.ManyToManyField(Mediafile, blank=True)
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# In theory there could be one then more agenda_item. But we support only
# one. See the property agenda_item.
agenda_items = GenericRelation(Item, related_name='topics')
class Meta:
default_permissions = ()
def __str__(self):
return self.title
def delete(self, skip_autoupdate=False, *args, **kwargs):
"""
Customized method to delete a topic. Ensures that a respective
topic projector element is disabled.
"""
Projector.remove_any(
skip_autoupdate=skip_autoupdate,
name='topics/topic',
id=self.pk)
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return super().delete(skip_autoupdate=skip_autoupdate, *args, **kwargs) # type: ignore
"""
Container for runtime information for agenda app (on create or update of this instance).
"""
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agenda_item_update_information: Dict[str, Any] = {}
@property
def agenda_item(self):
"""
Returns the related agenda item.
"""
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# We support only one agenda item so just return the first element of
# the queryset.
return self.agenda_items.all()[0]
@property
def agenda_item_id(self):
"""
Returns the id of the agenda item object related to this object.
"""
return self.agenda_item.pk
def get_agenda_title(self):
return self.title
def get_agenda_list_view_title(self):
return self.title