OpenSlides/openslides/assignments/models.py

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from collections import OrderedDict
from django.conf import settings
from django.contrib.contenttypes.fields import GenericRelation
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from django.db import models
from django.utils.translation import ugettext as _
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from django.utils.translation import ugettext_noop
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from openslides.agenda.models import Item, Speaker
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from openslides.core.config import config
from openslides.core.models import Tag
from openslides.poll.models import (
BaseOption,
BasePoll,
BaseVote,
CollectDefaultVotesMixin,
PublishPollMixin,
)
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from openslides.utils.autoupdate import inform_changed_data
from openslides.utils.exceptions import OpenSlidesError
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from openslides.utils.models import RESTModelMixin
from .access_permissions import AssignmentAccessPermissions
class AssignmentRelatedUser(RESTModelMixin, models.Model):
"""
Many to Many table between an assignment and user.
"""
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assignment = models.ForeignKey(
'Assignment',
on_delete=models.CASCADE,
related_name='assignment_related_users')
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"""
ForeinKey to the assignment.
"""
user = models.ForeignKey(
settings.AUTH_USER_MODEL,
on_delete=models.CASCADE)
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"""
ForeinKey to the user who is related to the assignment.
"""
elected = models.BooleanField(default=False)
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"""
Saves the election state of each user
"""
weight = models.IntegerField(default=0)
"""
The sort order of the candidates.
"""
class Meta:
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default_permissions = ()
unique_together = ('assignment', 'user')
def __str__(self):
return "%s <-> %s" % (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):
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"""
Customized model manager to support our get_full_queryset method.
"""
def get_full_queryset(self):
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"""
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')
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class Assignment(RESTModelMixin, models.Model):
"""
Model for assignments.
"""
access_permissions = AssignmentAccessPermissions()
objects = AssignmentManager()
PHASE_SEARCH = 0
PHASE_VOTING = 1
PHASE_FINISHED = 2
PHASES = (
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(PHASE_SEARCH, 'Searching for candidates'),
(PHASE_VOTING, 'Voting'),
(PHASE_FINISHED, 'Finished'),
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)
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.
"""
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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='assignments')
class Meta:
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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 = ugettext_noop('Election')
def __str__(self):
return self.title
def get_slide_context(self, **context):
"""
Retuns the context to generate the assignment slide.
"""
return super().get_slide_context(
polls=self.polls.filter(published=True),
vote_results=self.vote_results(only_published=True),
**context)
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@property
def candidates(self):
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"""
Queryset that represents the candidates for the assignment.
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"""
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)
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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.
"""
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weight = self.assignment_related_users.aggregate(
models.Max('weight'))['weight__max'] or 0
defaults = {
'elected': False,
'weight': weight + 1}
related_user, __ = self.assignment_related_users.update_or_create(
user=user,
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defaults=defaults)
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def set_elected(self, user):
"""
Makes user an elected user for this assignment.
"""
related_user, __ = 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()
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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("Invalid phase %s" % 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)
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options = []
related_users = AssignmentRelatedUser.objects.filter(assignment__id=self.id)
for related_user in related_users:
options.append({
'candidate': related_user.user,
'weight': related_user.weight})
poll.set_options(options)
# Add all candidates to list of speakers of related agenda item
# TODO: Try to do this in a bulk create
for candidate in self.candidates:
try:
Speaker.objects.add(candidate, self.agenda_item)
except OpenSlidesError:
# The Speaker is already on the list. Do nothing.
# TODO: Find a smart way not to catch the error concerning AnonymousUser.
pass
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return poll
def vote_results(self, only_published):
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"""
Returns a table represented as a list with all candidates from all
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related polls and their vote results.
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"""
vote_results_dict = OrderedDict()
polls = self.polls.all()
if only_published:
polls = polls.filter(published=True)
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# All PollOption-Objects related to this assignment
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options = []
for poll in polls:
options += poll.get_options()
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for option in options:
candidate = option.candidate
if candidate in vote_results_dict:
continue
vote_results_dict[candidate] = []
for poll in polls:
votes = {}
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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()
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except AssignmentOption.DoesNotExist:
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# candidate not in related to this poll
votes = None
vote_results_dict[candidate].append(votes)
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return vote_results_dict
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def get_agenda_title(self):
return str(self)
def get_agenda_list_view_title(self):
"""
Return a title string for the agenda list view.
Contains agenda item number, title and assignment verbose name.
Note: It has to be the same return value like in JavaScript.
"""
return '%s (%s)' % (self.title, _(self._meta.verbose_name))
@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
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class AssignmentVote(RESTModelMixin, BaseVote):
option = models.ForeignKey(
'AssignmentOption',
on_delete=models.CASCADE,
related_name='votes')
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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=models.CASCADE)
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weight = models.IntegerField(default=0)
vote_class = AssignmentVote
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class Meta:
default_permissions = ()
def __str__(self):
return str(self.candidate)
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def get_root_rest_element(self):
"""
Returns the assignment to this instance which is the root REST element.
"""
return self.poll.assignment
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class AssignmentPoll(RESTModelMixin, CollectDefaultVotesMixin,
PublishPollMixin, BasePoll):
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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)
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class Meta:
default_permissions = ()
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def get_assignment(self):
return self.assignment
def get_vote_values(self):
if self.pollmethod == 'yna':
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return ['Yes', 'No', 'Abstain']
elif self.pollmethod == 'yn':
return ['Yes', 'No']
else:
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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 append_pollform_fields(self, fields):
fields.append('description')
super().append_pollform_fields(fields)
def get_slide_context(self, **context):
return super().get_slide_context(poll=self)
def get_root_rest_element(self):
"""
Returns the assignment to this instance which is the root REST element.
"""
return self.assignment