from typing import Any, Dict from django.contrib.contenttypes.fields import GenericRelation from django.db import models from .models import Item, ListOfSpeakers # See https://github.com/python/mypy/issues/3855 Unsafe: Any = object class AgendaItemMixin(models.Model): """ A mixin for every model that should have an agenda item associated. """ # In theory there could be one then more agenda_item. But we support only one. agenda_items = GenericRelation(Item) class Meta(Unsafe): abstract = True """ Container for runtime information for agenda app (on create or update of this instance). Can be an attribute of an item, e.g. "type", "parent_id", "comment", "duration", "weight", or "create", which determinates, if the items should be created. If not given, the config value is used. """ agenda_item_update_information: Dict[str, Any] = {} agenda_item_skip_autoupdate = False @property def agenda_item(self): """ Returns the related agenda item, if it exists. """ try: return self.agenda_items.all()[0] except IndexError: return None @property def agenda_item_id(self): """ Returns the id of the agenda item object related to this object. """ if self.agenda_item is None: return None return self.agenda_item.pk def get_agenda_title_information(self): raise NotImplementedError( "An agenda content object has to provide title information" ) class ListOfSpeakersMixin(models.Model): """ A mixin for every model that should have a list of speakers associated. """ # In theory there could be one then more list of speakers. But we support only one. lists_of_speakers = GenericRelation(ListOfSpeakers) class Meta(Unsafe): abstract = True list_of_speakers_skip_autoupdate = False @property def list_of_speakers(self): """ Returns the related list of speakers object. """ # We support only one list of speakers so just return the first element of # the queryset. return self.lists_of_speakers.all()[0] @property def list_of_speakers_id(self): """ Returns the id of the list of speakers object related to this object. """ return self.list_of_speakers.pk def get_list_of_speakers_title_information(self): raise NotImplementedError( "An agenda content object has to provide title information" ) class AgendaItemWithListOfSpeakersMixin(AgendaItemMixin, ListOfSpeakersMixin): """ A combined mixin for agenda items and list of speakers. """ class Meta(Unsafe): abstract = True def set_skip_autoupdate_agenda_item_and_list_of_speakers( self, skip_autoupdate=True ): self.agenda_item_skip_autoupdate = skip_autoupdate self.list_of_speakers_skip_autoupdate = skip_autoupdate def get_title_information(self): raise NotImplementedError( "An agenda content object has to provide title information" ) def get_agenda_title_information(self): # TODO: See issue #4738 return self.get_title_information() def get_list_of_speakers_title_information(self): # TODO: See issue #4738 return self.get_title_information()