Sith/election/models.py

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from django.db import models
from ordered_model.models import OrderedModel
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from django.utils.translation import ugettext_lazy as _
from django.utils import timezone
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from core.models import User, Group
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class Election(models.Model):
"""
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This class allows to create a new election
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"""
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title = models.CharField(_("title"), max_length=255)
description = models.TextField(_("description"), null=True, blank=True)
start_candidature = models.DateTimeField(_("start candidature"), blank=False)
end_candidature = models.DateTimeField(_("end candidature"), blank=False)
start_date = models.DateTimeField(_("start date"), blank=False)
end_date = models.DateTimeField(_("end date"), blank=False)
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edit_groups = models.ManyToManyField(
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Group,
related_name="editable_elections",
verbose_name=_("edit groups"),
blank=True,
)
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view_groups = models.ManyToManyField(
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Group,
related_name="viewable_elections",
verbose_name=_("view groups"),
blank=True,
)
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vote_groups = models.ManyToManyField(
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Group,
related_name="votable_elections",
verbose_name=_("vote groups"),
blank=True,
)
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candidature_groups = models.ManyToManyField(
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Group,
related_name="candidate_elections",
verbose_name=_("candidature groups"),
blank=True,
)
voters = models.ManyToManyField(
User, verbose_name=("voters"), related_name="voted_elections"
)
archived = models.BooleanField(_("archived"), default=False)
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def __str__(self):
return self.title
@property
def is_vote_active(self):
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now = timezone.now()
return bool(now <= self.end_date and now >= self.start_date)
@property
def is_vote_finished(self):
return bool(timezone.now() > self.end_date)
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@property
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def is_candidature_active(self):
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now = timezone.now()
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return bool(now <= self.end_candidature and now >= self.start_candidature)
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@property
def is_vote_editable(self):
return bool(timezone.now() <= self.end_candidature)
def can_candidate(self, user):
for group in self.candidature_groups.all():
if user.is_in_group(group):
return True
return False
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def can_vote(self, user):
if not self.is_vote_active or self.has_voted(user):
return False
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for group in self.vote_groups.all():
if user.is_in_group(group):
return True
return False
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def has_voted(self, user):
return self.voters.filter(id=user.id).exists()
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@property
def results(self):
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results = {}
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total_vote = self.voters.count()
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for role in self.roles.all():
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results[role.title] = role.results(total_vote)
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return results
def delete(self):
for election_list in self.election_lists.all():
election_list.delete()
super(Election, self).delete()
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# Permissions
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class Role(OrderedModel):
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"""
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This class allows to create a new role avaliable for a candidature
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"""
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election = models.ForeignKey(
Election,
related_name="roles",
verbose_name=_("election"),
on_delete=models.CASCADE,
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)
title = models.CharField(_("title"), max_length=255)
description = models.TextField(_("description"), null=True, blank=True)
max_choice = models.IntegerField(_("max choice"), default=1)
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def results(self, total_vote):
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results = {}
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total_vote *= self.max_choice
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non_blank = 0
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for candidature in self.candidatures.all():
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cand_results = {}
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cand_results["vote"] = self.votes.filter(candidature=candidature).count()
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if total_vote == 0:
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cand_results["percent"] = 0
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else:
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cand_results["percent"] = cand_results["vote"] * 100 / total_vote
non_blank += cand_results["vote"]
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results[candidature.user.username] = cand_results
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results["total vote"] = total_vote
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if total_vote == 0:
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results["blank vote"] = {"vote": 0, "percent": 0}
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else:
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results["blank vote"] = {
"vote": total_vote - non_blank,
"percent": (total_vote - non_blank) * 100 / total_vote,
}
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return results
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@property
def edit_groups(self):
return self.election.edit_groups
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def __str__(self):
return ("%s : %s") % (self.election.title, self.title)
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class ElectionList(models.Model):
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"""
To allow per list vote
"""
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title = models.CharField(_("title"), max_length=255)
election = models.ForeignKey(
Election,
related_name="election_lists",
verbose_name=_("election"),
on_delete=models.CASCADE,
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)
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def can_be_edited_by(self, user):
return user.can_edit(self.election)
def delete(self):
for candidature in self.candidatures.all():
candidature.delete()
super(ElectionList, self).delete()
def __str__(self):
return self.title
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class Candidature(models.Model):
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"""
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This class is a component of responsability
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"""
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role = models.ForeignKey(
Role,
related_name="candidatures",
verbose_name=_("role"),
on_delete=models.CASCADE,
)
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user = models.ForeignKey(
User,
verbose_name=_("user"),
related_name="candidates",
blank=True,
on_delete=models.CASCADE,
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)
program = models.TextField(_("description"), null=True, blank=True)
election_list = models.ForeignKey(
ElectionList,
related_name="candidatures",
verbose_name=_("election list"),
on_delete=models.CASCADE,
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)
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def delete(self):
for vote in self.votes.all():
vote.delete()
super(Candidature, self).delete()
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def can_be_edited_by(self, user):
return (user == self.user) or user.can_edit(self.role.election)
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def __str__(self):
return "%s : %s" % (self.role.title, self.user.username)
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class Vote(models.Model):
"""
This class allows to vote for candidates
"""
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role = models.ForeignKey(
Role, related_name="votes", verbose_name=_("role"), on_delete=models.CASCADE
)
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candidature = models.ManyToManyField(
Candidature, related_name="votes", verbose_name=_("candidature")
)
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def __str__(self):
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return "Vote"