OpenSlides/openslides/poll/models.py

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import locale
from decimal import Decimal
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from typing import Optional, Type
from django.core.exceptions import ObjectDoesNotExist
from django.core.validators import MinValueValidator
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from django.db import models
from django.utils.translation import ugettext as _
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class BaseOption(models.Model):
"""
Base option class for a poll.
Subclasses have to define a poll field. This must be a ForeignKeyField
to a subclass of BasePoll. There must also be a vote_class attribute
which has to be a subclass of BaseVote. Otherwise you have to override the
get_vote_class method.
"""
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vote_class: Optional[Type["BaseVote"]] = None
class Meta:
abstract = True
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def get_votes(self):
return self.get_vote_class().objects.filter(option=self)
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def get_vote_class(self):
if self.vote_class is None:
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raise NotImplementedError(
"The option class %s has to have an attribute vote_class." % self
)
return self.vote_class
def __getitem__(self, name):
try:
return self.get_votes().get(value=name)
except self.get_vote_class().DoesNotExist:
raise KeyError
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class BaseVote(models.Model):
"""
Base vote class for an option.
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Subclasses have to define an option field. This must be a ForeignKeyField
to a subclass of BasePoll.
"""
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weight = models.DecimalField(
default=Decimal("1"),
null=True,
validators=[MinValueValidator(Decimal("-2"))],
max_digits=15,
decimal_places=6,
)
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value = models.CharField(max_length=255, null=True)
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class Meta:
abstract = True
def __str__(self):
return self.print_weight()
def get_value(self):
return _(self.value)
def print_weight(self, raw=False):
if raw:
return self.weight
try:
percent_base = self.option.poll.get_percent_base()
except AttributeError:
# The poll class is no child of CollectVotesCast
percent_base = 0
return print_value(self.weight, percent_base)
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class CollectDefaultVotesMixin(models.Model):
"""
Mixin for a poll to collect the default vote values for valid votes,
invalid votes and votes cast.
"""
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votesvalid = models.DecimalField(
null=True,
blank=True,
validators=[MinValueValidator(Decimal("-2"))],
max_digits=15,
decimal_places=6,
)
votesinvalid = models.DecimalField(
null=True,
blank=True,
validators=[MinValueValidator(Decimal("-2"))],
max_digits=15,
decimal_places=6,
)
votescast = models.DecimalField(
null=True,
blank=True,
validators=[MinValueValidator(Decimal("-2"))],
max_digits=15,
decimal_places=6,
)
class Meta:
abstract = True
def get_percent_base_choice(self):
"""
Returns one of the strings of the percent base.
"""
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raise NotImplementedError(
"You have to provide a get_percent_base_choice() method."
)
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class PublishPollMixin(models.Model):
"""
Mixin for a poll to add a flag whether the poll is published or not.
"""
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published = models.BooleanField(default=False)
class Meta:
abstract = True
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def set_published(self, published):
self.published = published
self.save()
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class BasePoll(models.Model):
"""
Base poll class.
"""
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vote_values = ["Votes"]
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class Meta:
abstract = True
def has_votes(self):
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"""
Returns True if there are votes in the poll.
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"""
if self.get_votes().exists():
return True
return False
def set_options(self, options_data=[], skip_autoupdate=False):
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"""
Adds new option objects to the poll.
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option_data: A list of arguments for the option.
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"""
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for option_data in options_data:
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option = self.get_option_class()(**option_data)
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option.poll = self
option.save(skip_autoupdate=skip_autoupdate)
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def get_options(self):
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"""
Returns the option objects for the poll.
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"""
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return self.get_option_class().objects.filter(poll=self)
def get_option_class(self):
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"""
Returns the option class for the poll. Default is self.option_class.
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"""
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return self.option_class
def get_vote_values(self):
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"""
Returns the possible values for the poll. Default is as list.
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"""
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return self.vote_values
def get_vote_class(self):
"""
Returns the related vote class.
"""
return self.get_option_class().vote_class
def get_votes(self):
"""
Return a QuerySet with all vote objects related to this poll.
"""
return self.get_vote_class().objects.filter(option__poll__id=self.id)
def set_vote_objects_with_values(self, option, data, skip_autoupdate=False):
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"""
Creates or updates the vote objects for the poll.
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"""
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for value in self.get_vote_values():
try:
vote = self.get_votes().filter(option=option).get(value=value)
except ObjectDoesNotExist:
vote = self.get_vote_class()(option=option, value=value)
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vote.weight = data[value]
vote.save(skip_autoupdate=skip_autoupdate)
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def get_vote_objects_with_values(self, option_id):
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"""
Returns the vote values and their weight as a list with two elements.
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"""
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values = []
for value in self.get_vote_values():
try:
vote = self.get_votes().filter(option=option_id).get(value=value)
except ObjectDoesNotExist:
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values.append(self.get_vote_class()(value=value, weight=""))
else:
values.append(vote)
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return values
def print_value(value, percent_base=0):
"""
Returns a human readable string for the vote value. It is 'majority',
'undocumented' or the vote value with percent value if so.
"""
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if value == -1:
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verbose_value = _("majority")
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elif value == -2:
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verbose_value = _("undocumented")
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elif value is None:
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verbose_value = _("undocumented")
else:
if percent_base:
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locale.setlocale(locale.LC_ALL, "")
verbose_value = "%d (%s %%)" % (
value,
locale.format("%.1f", value * percent_base),
)
else:
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verbose_value = "%s" % value
return verbose_value