Sith/club/models.py

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from django.db import models
from django.core import validators
from django.conf import settings
from django.utils.translation import ugettext_lazy as _
from django.core.exceptions import ValidationError
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from django.db import IntegrityError, transaction
from django.core.urlresolvers import reverse
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from django.utils import timezone
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from core.models import User, MetaGroup, Group, SithFile
# Create your models here.
class Club(models.Model):
"""
The Club class, made as a tree to allow nice tidy organization
"""
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name = models.CharField(_('name'), max_length=64)
parent = models.ForeignKey('Club', related_name='children', null=True, blank=True)
unix_name = models.CharField(_('unix name'), max_length=30, unique=True,
validators=[
validators.RegexValidator(
r'^[a-z0-9][a-z0-9._-]*[a-z0-9]$',
_('Enter a valid unix name. This value may contain only '
'letters, numbers ./-/_ characters.')
),
],
error_messages={
'unique': _("A club with that unix name already exists."),
},
)
address = models.CharField(_('address'), max_length=254)
# email = models.EmailField(_('email address'), unique=True) # This should, and will be generated automatically
owner_group = models.ForeignKey(Group, related_name="owned_club",
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default=settings.SITH_GROUP_ROOT_ID)
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edit_groups = models.ManyToManyField(Group, related_name="editable_club", blank=True)
view_groups = models.ManyToManyField(Group, related_name="viewable_club", blank=True)
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home = models.OneToOneField(SithFile, related_name='home_of_club', verbose_name=_("home"), null=True, blank=True,
on_delete=models.SET_NULL)
def check_loop(self):
"""Raise a validation error when a loop is found within the parent list"""
objs = []
cur = self
while cur.parent is not None:
if cur in objs:
raise ValidationError(_('You can not make loops in clubs'))
objs.append(cur)
cur = cur.parent
def clean(self):
self.check_loop()
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def _change_unixname(self, new_name):
c = Club.objects.filter(unix_name=new_name).first()
if c is None:
if self.home:
self.home.name = new_name
self.home.save()
else:
raise ValidationError(_("A club with that unix_name already exists"))
def make_home(self):
if not self.home:
home_root = SithFile.objects.filter(parent=None, name="clubs").first()
root = User.objects.filter(username="root").first()
if home_root and root:
home = SithFile(parent=home_root, name=self.unix_name, owner=root)
home.save()
self.home = home
self.save()
def save(self, *args, **kwargs):
with transaction.atomic():
creation = False
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old = Club.objects.filter(id=self.id).first()
if not old:
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creation = True
else:
if old.unix_name != self.unix_name:
self._change_unixname(self.unix_name)
super(Club, self).save(*args, **kwargs)
if creation:
board = MetaGroup(name=self.unix_name+settings.SITH_BOARD_SUFFIX)
board.save()
member = MetaGroup(name=self.unix_name+settings.SITH_MEMBER_SUFFIX)
member.save()
subscribers = Group.objects.filter(name=settings.SITH_MAIN_MEMBERS_GROUP).first()
self.make_home()
self.home.edit_groups = [board]
self.home.view_groups = [member, subscribers]
self.home.save()
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def __str__(self):
return self.name
def get_absolute_url(self):
return reverse('club:club_view', kwargs={'club_id': self.id})
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def get_display_name(self):
return self.name
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def is_owned_by(self, user):
"""
Method to see if that object can be super edited by the given user
"""
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return user.is_in_group(settings.SITH_MAIN_BOARD_GROUP)
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def can_be_edited_by(self, user):
"""
Method to see if that object can be edited by the given user
"""
ms = self.get_membership_for(user)
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if ms is not None:
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return True
return False
def can_be_viewed_by(self, user):
"""
Method to see if that object can be seen by the given user
"""
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sub = User.objects.filter(pk=user.pk).first()
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if sub is None:
return False
return sub.is_subscribed()
def get_membership_for(self, user):
"""
Returns the current membership the given user
"""
return self.members.filter(user=user.id).filter(end_date=None).first()
class Membership(models.Model):
"""
The Membership class makes the connection between User and Clubs
Both Users and Clubs can have many Membership objects:
- a user can be a member of many clubs at a time
- a club can have many members at a time too
A User is currently member of all the Clubs where its Membership has an end_date set to null/None.
Otherwise, it's a past membership kept because it can be very useful to see who was in which Club in the past.
"""
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user = models.ForeignKey(User, verbose_name=_('user'), related_name="memberships", null=False, blank=False)
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club = models.ForeignKey(Club, verbose_name=_('club'), related_name="members", null=False, blank=False)
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start_date = models.DateField(_('start date'), default=timezone.now)
end_date = models.DateField(_('end date'), null=True, blank=True)
role = models.IntegerField(_('role'), choices=sorted(settings.SITH_CLUB_ROLES.items()),
default=sorted(settings.SITH_CLUB_ROLES.items())[0][0])
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description = models.CharField(_('description'), max_length=128, null=False, blank=True)
def clean(self):
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sub = User.objects.filter(pk=self.user.pk).first()
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if sub is None or not sub.is_subscribed():
raise ValidationError(_('User must be subscriber to take part to a club'))
if Membership.objects.filter(user=self.user).filter(club=self.club).filter(end_date=None).exists():
raise ValidationError(_('User is already member of that club'))
def __str__(self):
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return self.club.name+' - '+self.user.username+' - '+str(settings.SITH_CLUB_ROLES[self.role])+str(
" - "+str(_('past member')) if self.end_date is not None else ""
)
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def is_owned_by(self, user):
"""
Method to see if that object can be super edited by the given user
"""
return user.is_in_group(settings.SITH_MAIN_BOARD_GROUP)
def can_be_edited_by(self, user):
"""
Method to see if that object can be edited by the given user
"""
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if user.memberships:
ms = user.memberships.filter(club=self.club, end_date=None).first()
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return (ms and ms.role >= self.role) or user.is_in_group(settings.SITH_MAIN_BOARD_GROUP)
return user.is_in_group(settings.SITH_MAIN_BOARD_GROUP)
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def get_absolute_url(self):
return reverse('club:club_members', kwargs={'club_id': self.club.id})