OpenSlides/openslides/assignments/models.py
FinnStutzenstein ecdfdf4b87 Resort python import for isort 4.3.11 (fixes #4467)
One dot imports are again behind two dot imports since this new isort
release.
2019-03-06 14:54:03 +01:00

434 lines
13 KiB
Python

from collections import OrderedDict
from decimal import Decimal
from typing import Any, Dict, List
from django.conf import settings
from django.contrib.contenttypes.fields import GenericRelation
from django.core.validators import MinValueValidator
from django.db import models
from openslides.agenda.models import Item, Speaker
from openslides.core.config import config
from openslides.core.models import Tag
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_AUTOUODATE, 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_AUTOUODATE)
"""
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", "polls", "tags"
)
class Assignment(RESTModelMixin, 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.
"""
# 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="assignments")
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.agenda_item, 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.agenda_item)
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
"""
Container for runtime information for agenda app (on create or update of this instance).
"""
agenda_item_update_information: Dict[str, Any] = {}
def get_agenda_title_information(self):
return {"title": self.title}
@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
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