from typing import Any, Dict from django.contrib.contenttypes.fields import GenericRelation from django.db import models from .access_permissions import TopicAccessPermissions from ..agenda.models import Item from ..mediafiles.models import Mediafile from ..utils.models import RESTModelMixin class TopicManager(models.Manager): """ 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() objects = TopicManager() title = models.CharField(max_length=256) text = models.TextField(blank=True) attachments = models.ManyToManyField(Mediafile, blank=True) # 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 """ Container for runtime information for agenda app (on create or update of this instance). """ agenda_item_update_information: Dict[str, Any] = {} @property def agenda_item(self): """ Returns the related agenda item. """ # 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_information(self): return {"title": self.title}