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 from core.models import User # Create your models here. class Club(models.Model): """ The Club class, made as a tree to allow nice tidy organization """ name = models.CharField(_('name'), max_length=30) 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 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() def __str__(self): return self.name 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. """ user = models.ForeignKey(User, related_name="membership", null=False, blank=False) club = models.ForeignKey(Club, related_name="members", null=False, blank=False) start_date = models.DateField(_('start date'), auto_now=True) end_date = models.DateField(_('end date'), null=True, blank=True) role = models.IntegerField(_('role'), choices=sorted(settings.CLUB_ROLES.items()), default=sorted(settings.CLUB_ROLES.items())[0][0]) description = models.CharField(_('description'), max_length=30, null=False, blank=True) def clean(self): if Membership.objects.filter(user=self.user).filter(club=self.club).filter(end_date=None).exclude(pk=self.pk).exists(): raise ValidationError(_('User is already member of that club')) def __str__(self): return self.club.name+' - '+self.user.username+' - '+settings.CLUB_ROLES[self.role]+str( " - "+str(_('past member')) if self.end_date is not None else "" )