from collections import OrderedDict from decimal import Decimal from typing import Any, Dict, List from django.conf import settings from django.core.validators import MinValueValidator from django.db import models from openslides.agenda.mixins import AgendaItemWithListOfSpeakersMixin from openslides.agenda.models import Speaker from openslides.core.config import config from openslides.core.models import Tag from openslides.mediafiles.models import Mediafile from openslides.poll.models import ( BaseOption, BasePoll, BaseVote, CollectDefaultVotesMixin, PublishPollMixin, ) from openslides.utils.autoupdate import inform_changed_data from openslides.utils.exceptions import OpenSlidesError from openslides.utils.models import RESTModelMixin from ..utils.models import CASCADE_AND_AUTOUPDATE, SET_NULL_AND_AUTOUPDATE from .access_permissions import AssignmentAccessPermissions class AssignmentRelatedUser(RESTModelMixin, models.Model): """ Many to Many table between an assignment and user. """ assignment = models.ForeignKey( "Assignment", on_delete=models.CASCADE, related_name="assignment_related_users" ) """ ForeinKey to the assignment. """ user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=CASCADE_AND_AUTOUPDATE) """ ForeinKey to the user who is related to the assignment. """ elected = models.BooleanField(default=False) """ Saves the election state of each user """ weight = models.IntegerField(default=0) """ The sort order of the candidates. """ class Meta: default_permissions = () unique_together = ("assignment", "user") def __str__(self): return f"{self.assignment} <-> {self.user}" def get_root_rest_element(self): """ Returns the assignment to this instance which is the root REST element. """ return self.assignment class AssignmentManager(models.Manager): """ Customized model manager to support our get_full_queryset method. """ def get_full_queryset(self): """ Returns the normal queryset with all assignments. In the background all related users (candidates), the related agenda item and all polls are prefetched from the database. """ return self.get_queryset().prefetch_related( "related_users", "agenda_items", "lists_of_speakers", "polls", "tags", "attachments", ) class Assignment(RESTModelMixin, AgendaItemWithListOfSpeakersMixin, models.Model): """ Model for assignments. """ access_permissions = AssignmentAccessPermissions() can_see_permission = "assignments.can_see" objects = AssignmentManager() PHASE_SEARCH = 0 PHASE_VOTING = 1 PHASE_FINISHED = 2 PHASES = ( (PHASE_SEARCH, "Searching for candidates"), (PHASE_VOTING, "Voting"), (PHASE_FINISHED, "Finished"), ) title = models.CharField(max_length=100) """ Title of the assignment. """ description = models.TextField(blank=True) """ Text to describe the assignment. """ open_posts = models.PositiveSmallIntegerField() """ The number of members to be elected. """ poll_description_default = models.CharField(max_length=79, blank=True) """ Default text for the poll description. """ phase = models.IntegerField(choices=PHASES, default=PHASE_SEARCH) """ Phase in which the assignment is. """ related_users = models.ManyToManyField( settings.AUTH_USER_MODEL, through="AssignmentRelatedUser" ) """ Users that are candidates or elected. See AssignmentRelatedUser for more information. """ tags = models.ManyToManyField(Tag, blank=True) """ Tags for the assignment. """ attachments = models.ManyToManyField(Mediafile, blank=True) """ Mediafiles as attachments for this assignment. """ class Meta: default_permissions = () permissions = ( ("can_see", "Can see elections"), ("can_nominate_other", "Can nominate another participant"), ("can_nominate_self", "Can nominate oneself"), ("can_manage", "Can manage elections"), ) ordering = ("title",) verbose_name = "Election" def __str__(self): return self.title @property def candidates(self): """ Queryset that represents the candidates for the assignment. """ return self.related_users.filter(assignmentrelateduser__elected=False) @property def elected(self): """ Queryset that represents all elected users for the assignment. """ return self.related_users.filter(assignmentrelateduser__elected=True) def is_candidate(self, user): """ Returns True if user is a candidate. Costs one database query. """ return self.candidates.filter(pk=user.pk).exists() def is_elected(self, user): """ Returns True if the user is elected for this assignment. Costs one database query. """ return self.elected.filter(pk=user.pk).exists() def set_candidate(self, user): """ Adds the user as candidate. """ weight = ( self.assignment_related_users.aggregate(models.Max("weight"))["weight__max"] or 0 ) defaults = {"elected": False, "weight": weight + 1} self.assignment_related_users.update_or_create(user=user, defaults=defaults) def set_elected(self, user): """ Makes user an elected user for this assignment. """ self.assignment_related_users.update_or_create( user=user, defaults={"elected": True} ) def delete_related_user(self, user): """ Delete the connection from the assignment to the user. """ self.assignment_related_users.filter(user=user).delete() inform_changed_data(self) def set_phase(self, phase): """ Sets the phase attribute of the assignment. Raises a ValueError if the phase is not valide. """ if phase not in dict(self.PHASES): raise ValueError(f"Invalid phase {phase}") self.phase = phase def create_poll(self): """ Creates a new poll for the assignment and adds all candidates to all lists of speakers of related agenda items. """ candidates = self.candidates.all() # Find out the method of the election if config["assignments_poll_vote_values"] == "votes": pollmethod = "votes" elif config["assignments_poll_vote_values"] == "yesnoabstain": pollmethod = "yna" elif config["assignments_poll_vote_values"] == "yesno": pollmethod = "yn" else: # config['assignments_poll_vote_values'] == 'auto' # candidates <= available posts -> yes/no/abstain if len(candidates) <= (self.open_posts - self.elected.count()): pollmethod = "yna" else: pollmethod = "votes" # Create the poll with the candidates. poll = self.polls.create( description=self.poll_description_default, pollmethod=pollmethod ) options = [] related_users = AssignmentRelatedUser.objects.filter( assignment__id=self.id ).exclude(elected=True) for related_user in related_users: options.append( {"candidate": related_user.user, "weight": related_user.weight} ) poll.set_options(options, skip_autoupdate=True) inform_changed_data(self) # Add all candidates to list of speakers of related agenda item # TODO: Try to do this in a bulk create if config["assignments_add_candidates_to_list_of_speakers"]: for candidate in self.candidates: try: Speaker.objects.add( candidate, self.list_of_speakers, skip_autoupdate=True ) except OpenSlidesError: # The Speaker is already on the list. Do nothing. # TODO: Find a smart way not to catch the error concerning AnonymousUser. pass inform_changed_data(self.list_of_speakers) return poll def vote_results(self, only_published): """ Returns a table represented as a list with all candidates from all related polls and their vote results. """ vote_results_dict: Dict[Any, List[AssignmentVote]] = OrderedDict() polls = self.polls.all() if only_published: polls = polls.filter(published=True) # All PollOption-Objects related to this assignment options: List[AssignmentOption] = [] for poll in polls: options += poll.get_options() for option in options: candidate = option.candidate if candidate in vote_results_dict: continue vote_results_dict[candidate] = [] for poll in polls: votes: Any = {} try: # candidate related to this poll poll_option = poll.get_options().get(candidate=candidate) for vote in poll_option.get_votes(): votes[vote.value] = vote.print_weight() except AssignmentOption.DoesNotExist: # candidate not in related to this poll votes = None vote_results_dict[candidate].append(votes) return vote_results_dict def get_title_information(self): return {"title": self.title} class AssignmentVote(RESTModelMixin, BaseVote): option = models.ForeignKey( "AssignmentOption", on_delete=models.CASCADE, related_name="votes" ) class Meta: default_permissions = () def get_root_rest_element(self): """ Returns the assignment to this instance which is the root REST element. """ return self.option.poll.assignment class AssignmentOption(RESTModelMixin, BaseOption): poll = models.ForeignKey( "AssignmentPoll", on_delete=models.CASCADE, related_name="options" ) candidate = models.ForeignKey( settings.AUTH_USER_MODEL, on_delete=SET_NULL_AND_AUTOUPDATE, null=True ) weight = models.IntegerField(default=0) vote_class = AssignmentVote class Meta: default_permissions = () def __str__(self): return str(self.candidate) def get_root_rest_element(self): """ Returns the assignment to this instance which is the root REST element. """ return self.poll.assignment # TODO: remove the type-ignoring in the next line, after this is solved: # https://github.com/python/mypy/issues/3855 class AssignmentPoll( # type: ignore RESTModelMixin, CollectDefaultVotesMixin, PublishPollMixin, BasePoll ): option_class = AssignmentOption assignment = models.ForeignKey( Assignment, on_delete=models.CASCADE, related_name="polls" ) pollmethod = models.CharField(max_length=5, default="yna") description = models.CharField(max_length=79, blank=True) votesabstain = models.DecimalField( null=True, blank=True, validators=[MinValueValidator(Decimal("-2"))], max_digits=15, decimal_places=6, ) """ General abstain votes, used for pollmethod 'votes' """ votesno = models.DecimalField( null=True, blank=True, validators=[MinValueValidator(Decimal("-2"))], max_digits=15, decimal_places=6, ) """ General no votes, used for pollmethod 'votes' """ class Meta: default_permissions = () def get_assignment(self): return self.assignment def get_vote_values(self): if self.pollmethod == "yna": return ["Yes", "No", "Abstain"] if self.pollmethod == "yn": return ["Yes", "No"] return ["Votes"] def get_ballot(self): return self.assignment.polls.filter(id__lte=self.pk).count() def get_percent_base_choice(self): return config["assignments_poll_100_percent_base"] def get_root_rest_element(self): """ Returns the assignment to this instance which is the root REST element. """ return self.assignment