models.py 29.6 KB
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from django.db import models
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from django.contrib.auth.models import AbstractBaseUser, PermissionsMixin, UserManager, Group as AuthGroup, GroupManager as AuthGroupManager, AnonymousUser as AuthAnonymousUser
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from django.utils.translation import ugettext_lazy as _
from django.utils import timezone
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from django.core import validators
from django.core.exceptions import ValidationError
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from django.core.urlresolvers import reverse
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from django.conf import settings
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from django.db import transaction
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from django.contrib.staticfiles.storage import staticfiles_storage
from django.utils.html import escape
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from phonenumber_field.modelfields import PhoneNumberField

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from datetime import datetime, timedelta, date
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import unicodedata

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class RealGroupManager(AuthGroupManager):
    def get_queryset(self):
        return super(RealGroupManager, self).get_queryset().filter(is_meta=False)

class MetaGroupManager(AuthGroupManager):
    def get_queryset(self):
        return super(MetaGroupManager, self).get_queryset().filter(is_meta=True)

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class Group(AuthGroup):
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    is_meta = models.BooleanField(
        _('meta group status'),
        default=False,
        help_text=_('Whether a group is a meta group or not'),
    )
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    description = models.CharField(_('description'), max_length=60)
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    def get_absolute_url(self):
        """
        This is needed for black magic powered UpdateView's children
        """
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        return reverse('core:group_list')
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class MetaGroup(Group):
    objects = MetaGroupManager()
    class Meta:
        proxy = True

    def __init__(self, *args, **kwargs):
        super(MetaGroup, self).__init__(*args, **kwargs)
        self.is_meta = True

class RealGroup(Group):
    objects = RealGroupManager()
    class Meta:
        proxy = True

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def validate_promo(value):
    start_year = settings.SITH_SCHOOL_START_YEAR
    delta = (date.today()+timedelta(days=180)).year - start_year
    if value < 0 or delta < value:
        raise ValidationError(
            _('%(value)s is not a valid promo (between 0 and %(end)s)'),
            params={'value': value, 'end': delta},
        )

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class User(AbstractBaseUser):
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    """
    Defines the base user class, useable in every app
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    This is almost the same as the auth module AbstractUser since it inherits from it,
    but some fields are required, and the username is generated automatically with the
    name of the user (see generate_username()).
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    Added field: nick_name, date_of_birth
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    Required fields: email, first_name, last_name, date_of_birth
    """
    username = models.CharField(
        _('username'),
        max_length=254,
        unique=True,
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        help_text=_('Required. 254 characters or fewer. Letters, digits and ./+/-/_ only.'),
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        validators=[
            validators.RegexValidator(
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                r'^[\w.+-]+$',
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                _('Enter a valid username. This value may contain only '
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                  'letters, numbers ' 'and ./+/-/_ characters.')
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            ),
        ],
        error_messages={
            'unique': _("A user with that username already exists."),
        },
    )
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    first_name = models.CharField(_('first name'), max_length=64)
    last_name = models.CharField(_('last name'), max_length=64)
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    email = models.EmailField(_('email address'), unique=True)
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    date_of_birth = models.DateField(_('date of birth'), blank=True, null=True)
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    nick_name = models.CharField(_('nick name'), max_length=64, null=True, blank=True)
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    is_staff = models.BooleanField(
        _('staff status'),
        default=False,
        help_text=_('Designates whether the user can log into this admin site.'),
    )
    is_active = models.BooleanField(
        _('active'),
        default=True,
        help_text=_(
            'Designates whether this user should be treated as active. '
            'Unselect this instead of deleting accounts.'
        ),
    )
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    date_joined = models.DateField(_('date joined'), auto_now_add=True)
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    last_update = models.DateField(_('last update'), auto_now=True)
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    is_superuser = models.BooleanField(
        _('superuser'),
        default=False,
        help_text=_(
            'Designates whether this user is a superuser. '
        ),
    )
    groups = models.ManyToManyField(RealGroup, related_name='users', blank=True)
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    home = models.OneToOneField('SithFile', related_name='home_of', verbose_name=_("home"), null=True, blank=True)
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    profile_pict = models.OneToOneField('SithFile', related_name='profile_of', verbose_name=_("profile"), null=True,
            blank=True, on_delete=models.SET_NULL)
    avatar_pict = models.OneToOneField('SithFile', related_name='avatar_of', verbose_name=_("avatar"), null=True,
            blank=True, on_delete=models.SET_NULL)
    scrub_pict = models.OneToOneField('SithFile', related_name='scrub_of', verbose_name=_("scrub"), null=True,
            blank=True, on_delete=models.SET_NULL)
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    sex = models.CharField(_("sex"), max_length=10, choices=[("MAN", _("Man")), ("WOMAN", _("Woman"))], default="MAN")
    tshirt_size = models.CharField(_("tshirt size"), max_length=5, choices=[
        ("-", _("-")),
        ("XS", _("XS")),
        ("S", _("S")),
        ("M", _("M")),
        ("L", _("L")),
        ("XL", _("XL")),
        ("XXL", _("XXL")),
        ("XXXL", _("XXXL")),
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        ], default="-")
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    role = models.CharField(_("role"), max_length=15, choices=[
        ("STUDENT", _("Student")),
        ("ADMINISTRATIVE", _("Administrative agent")),
        ("TEACHER", _("Teacher")),
        ("AGENT", _("Agent")),
        ("DOCTOR", _("Doctor")),
        ("FORMER STUDENT", _("Former student")),
        ("SERVICE", _("Service")),
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        ], blank=True, default="")
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    department = models.CharField(_("department"), max_length=15, choices=[
        ("TC", _("TC")),
        ("IMSI", _("IMSI")),
        ("IMAP", _("IMAP")),
        ("INFO", _("INFO")),
        ("GI", _("GI")),
        ("E", _("E")),
        ("EE", _("EE")),
        ("GESC", _("GESC")),
        ("GMC", _("GMC")),
        ("MC", _("MC")),
        ("EDIM", _("EDIM")),
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        ("HUMA", _("Humanities")),
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        ("NA", _("N/A")),
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        ], default="NA", blank=True)
    dpt_option = models.CharField(_("dpt option"), max_length=32, blank=True, default="")
    semester = models.CharField(_("semester"), max_length=5, blank=True, default="")
    quote = models.CharField(_("quote"), max_length=256, blank=True, default="")
    school = models.CharField(_("school"), max_length=80, blank=True, default="")
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    promo = models.IntegerField(_("promo"), validators=[validate_promo], null=True, blank=True)
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    forum_signature = models.TextField(_("forum signature"), max_length=256, blank=True, default="")
    second_email = models.EmailField(_('second email address'), null=True, blank=True)
    phone = PhoneNumberField(_("phone"), null=True, blank=True)
    parent_phone = PhoneNumberField(_("parent phone"), null=True, blank=True)
    address = models.CharField(_("address"), max_length=128, blank=True, default="")
    parent_address = models.CharField(_("parent address"), max_length=128, blank=True, default="")
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    is_subscriber_viewable = models.BooleanField(_("is subscriber viewable"), default=True)
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    godfathers = models.ManyToManyField('User', related_name='godchildren', blank=True)
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    is_banned_alcohol = models.BooleanField(
        _('banned from buying alcohol'),
        default=False,
        help_text=_(
            'Designates whether this user is denyed from buying alchool. '
        ),
    )
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    objects = UserManager()

    USERNAME_FIELD = 'username'
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    # REQUIRED_FIELDS = ['email']
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    def has_module_perms(self, package_name):
        return self.is_active

    def has_perm(self, perm, obj=None):
        return self.is_active and self.is_superuser

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    def get_absolute_url(self):
        """
        This is needed for black magic powered UpdateView's children
        """
        return reverse('core:user_profile', kwargs={'user_id': self.pk})

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    def __str__(self):
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        return self.username
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    def to_dict(self):
        return self.__dict__

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    def is_in_group(self, group_name):
        """If the user is in the group passed in argument (as string)"""
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        if group_name == settings.SITH_GROUPS['public']['name']:
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            return True
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        if group_name == settings.SITH_MAIN_MEMBERS_GROUP: # We check the subscription if asked
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            if 'subscription' in settings.INSTALLED_APPS:
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                from subscription.models import Subscriber
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                s = Subscriber.objects.filter(pk=self.pk).first()
                if s is not None and s.is_subscribed():
                    return True
                else:
                    return False
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            else:
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                return False
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        if group_name[-len(settings.SITH_BOARD_SUFFIX):] == settings.SITH_BOARD_SUFFIX:
            from club.models import Club
            name = group_name[:-len(settings.SITH_BOARD_SUFFIX)]
            c = Club.objects.filter(unix_name=name).first()
            mem = c.get_membership_for(self)
            if mem:
                return mem.role > settings.SITH_MAXIMUM_FREE_ROLE
            return False
        if group_name[-len(settings.SITH_MEMBER_SUFFIX):] == settings.SITH_MEMBER_SUFFIX:
            from club.models import Club
            name = group_name[:-len(settings.SITH_MEMBER_SUFFIX)]
            c = Club.objects.filter(unix_name=name).first()
            mem = c.get_membership_for(self)
            if mem:
                return True
            return False
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        if group_name == settings.SITH_GROUPS['root']['name'] and self.is_superuser:
            return True
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        return self.groups.filter(name=group_name).exists()

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    @property
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    def is_root(self):
        return self.is_superuser or self.groups.filter(name=settings.SITH_GROUPS['root']['name']).exists()

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    @property
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    def is_board_member(self):
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        from club.models import Club
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        return Club.objects.filter(unix_name=settings.SITH_MAIN_CLUB['unix_name']).first().get_membership_for(self)

    @property
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    def is_launderette_manager(self):
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        from club.models import Club
        return Club.objects.filter(unix_name=settings.SITH_LAUNDERETTE_MANAGER['unix_name']).first().get_membership_for(self)
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    def save(self, *args, **kwargs):
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        create = False
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        with transaction.atomic():
            if self.id:
                old = User.objects.filter(id=self.id).first()
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                if old and old.username != self.username:
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                    self._change_username(self.username)
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            else:
                create = True
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            super(User, self).save(*args, **kwargs)
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            if create and settings.IS_OLD_MYSQL_PRESENT: # Create user on the old site: TODO remove me!
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                import MySQLdb
                try:
                    db = MySQLdb.connect(**settings.OLD_MYSQL_INFOS)
                    c = db.cursor()
                    c.execute("""INSERT INTO utilisateurs (id_utilisateur, nom_utl, prenom_utl, email_utl, hash_utl, ae_utl) VALUES
                    (%s, %s, %s, %s, %s, %s)""", (self.id, self.last_name, self.first_name, self.email, "valid", "0"))
                    db.commit()
                except Exception as e:
                    with open(settings.BASE_DIR+"/user_fail.log", "a") as f:
                        print("FAIL to add user %s (%s %s - %s) to old site" % (self.id, self.first_name, self.last_name,
                            self.email), file=f)
                        print("Reason: %s" % (repr(e)), file=f)
                    db.rollback()
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    def make_home(self):
        if self.home is None:
            home_root = SithFile.objects.filter(parent=None, name="users").first()
            if home_root is not None:
                home = SithFile(parent=home_root, name=self.username, owner=self)
                home.save()
                self.home = home
                self.save()

    def _change_username(self, new_name):
        u = User.objects.filter(username=new_name).first()
        if u is None:
            if self.home:
                self.home.name = new_name
                self.home.save()
        else:
            raise ValidationError(_("A user with that username already exists"))

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    def get_profile(self):
        return {
            "last_name": self.last_name,
            "first_name": self.first_name,
            "nick_name": self.nick_name,
            "date_of_birth": self.date_of_birth,
        }

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    def get_full_name(self):
        """
        Returns the first_name plus the last_name, with a space in between.
        """
        full_name = '%s %s' % (self.first_name, self.last_name)
        return full_name.strip()

    def get_short_name(self):
        "Returns the short name for the user."
        return self.first_name

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    def get_display_name(self):
        """
        Returns the display name of the user.
        A nickname if possible, otherwise, the full name
        """
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        if self.nick_name:
            return "%s (%s)" % (self.get_full_name(), self.nick_name)
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        return self.get_full_name()

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    def get_age(self):
        """
        Returns the age
        """
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        today = timezone.now()
        born = self.date_of_birth
        return today.year - born.year - ((today.month, today.day) < (born.month, born.day))
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    def email_user(self, subject, message, from_email=None, **kwargs):
        """
        Sends an email to this User.
        """
        send_mail(subject, message, from_email, [self.email], **kwargs)

    def generate_username(self):
        """
        Generates a unique username based on the first and last names.
        For example: Guy Carlier gives gcarlier, and gcarlier1 if the first one exists
        Returns the generated username
        """
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        def remove_accents(data):
            return ''.join(x for x in unicodedata.normalize('NFKD', data) if \
            unicodedata.category(x)[0] == 'L').lower()
        user_name = remove_accents(self.first_name[0]+self.last_name).encode('ascii', 'ignore').decode('utf-8')
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        un_set = [u.username for u in User.objects.all()]
        if user_name in un_set:
            i = 1
            while user_name+str(i) in un_set:
                i += 1
            user_name += str(i)
        self.username = user_name
        return user_name
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    def is_owner(self, obj):
        """
        Determine if the object is owned by the user
        """
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        if hasattr(obj, "is_owned_by") and obj.is_owned_by(self):
            return True
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        if hasattr(obj, "owner_group") and self.is_in_group(obj.owner_group.name):
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            return True
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        if self.is_superuser or self.is_in_group(settings.SITH_GROUPS['root']['name']):
            return True
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        return False

    def can_edit(self, obj):
        """
        Determine if the object can be edited by the user
        """
        if self.is_owner(obj):
            return True
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        if hasattr(obj, "edit_groups"):
            for g in obj.edit_groups.all():
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                if self.is_in_group(g.name):
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                    return True
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        if isinstance(obj, User) and obj == self:
            return True
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        if hasattr(obj, "can_be_edited_by") and obj.can_be_edited_by(self):
            return True
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        return False

    def can_view(self, obj):
        """
        Determine if the object can be viewed by the user
        """
        if self.can_edit(obj):
            return True
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        if hasattr(obj, "view_groups"):
            for g in obj.view_groups.all():
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                if self.is_in_group(g.name):
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                    return True
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        if hasattr(obj, "can_be_viewed_by") and obj.can_be_viewed_by(self):
            return True
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        return False

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    def can_be_edited_by(self, user):
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        return user.is_in_group(settings.SITH_MAIN_BOARD_GROUP) or user.is_root
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    def can_be_viewed_by(self, user):
        return (user.is_in_group(settings.SITH_MAIN_MEMBERS_GROUP) and self.is_subscriber_viewable) or user.is_root

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    def get_mini_item(self):
        return """
    <div class="mini_profile_link" >
    <span>
    <img src="%s" alt="%s" />
    </span>
    <em>%s</em>
    </a>
    """ % (
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            self.profile_pict.get_download_url() if self.profile_pict else staticfiles_storage.url("core/img/unknown.jpg"),
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            _("Profile"),
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            escape(self.get_display_name()),
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            )

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    @property
    def subscribed(self):
        return self.is_in_group(settings.SITH_MAIN_MEMBERS_GROUP)
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class AnonymousUser(AuthAnonymousUser):
    def __init__(self, request):
        super(AnonymousUser, self).__init__()

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    @property
    def subscribed(self):
        return False

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    @property
    def is_root(self):
        return False

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    @property
    def is_board_member(self):
        return False

    @property
    def is_launderette_manager(self):
        return False

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    def is_in_group(self, group_name):
        """
        The anonymous user is only the public group
        """
        if group_name == settings.SITH_GROUPS['public']['name']:
            return True
        return False

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    def is_owner(self, obj):
        return False

    def can_edit(self, obj):
        return False

    def can_view(self, obj):
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        if hasattr(obj, 'view_groups') and obj.view_groups.filter(pk=settings.SITH_GROUPS['public']['id']).exists():
            return True
        if hasattr(obj, 'can_be_viewed_by') and obj.can_be_viewed_by(self):
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            return True
        return False

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    def get_display_name(self):
        return _("Visitor")

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class Preferences(models.Model):
    user = models.OneToOneField(User, related_name="preferences")
    show_my_stats = models.BooleanField(
        _('define if we show a users stats'),
        default=False,
        help_text=_('Show your account statistics to others'),
    )

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def get_directory(instance, filename):
    return './{0}/{1}'.format(instance.get_parent_path(), filename)

class SithFile(models.Model):
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    name = models.CharField(_('file name'), max_length=256, blank=False)
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    parent = models.ForeignKey('self', related_name="children", verbose_name=_("parent"), null=True, blank=True)
    file = models.FileField(upload_to=get_directory, verbose_name=_("file"), null=True, blank=True)
    owner = models.ForeignKey(User, related_name="owned_files", verbose_name=_("owner"))
    edit_groups = models.ManyToManyField(Group, related_name="editable_files", verbose_name=_("edit group"), blank=True)
    view_groups = models.ManyToManyField(Group, related_name="viewable_files", verbose_name=_("view group"), blank=True)
    is_folder = models.BooleanField(_("is folder"), default=True)
    mime_type = models.CharField(_('mime type'), max_length=30)
    size = models.IntegerField(_("size"), default=0)
    date = models.DateTimeField(_('date'), auto_now=True)

    class Meta:
        verbose_name = _("file")

    def is_owned_by(self, user):
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        if hasattr(self, 'profile_of') and user.is_in_group(settings.SITH_MAIN_BOARD_GROUP):
            return True
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        return user.id == self.owner.id

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    def can_be_viewed_by(self, user):
        if hasattr(self, 'profile_of'):
            return user.can_view(self.profile_of)
        if hasattr(self, 'avatar_of'):
            return user.can_view(self.avatar_of)
        if hasattr(self, 'scrub_of'):
            return user.can_view(self.scrub_of)
        return False

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    def delete(self):
        for c in self.children.all():
            c.delete()
        self.file.delete()
        return super(SithFile, self).delete()

    def clean(self):
        """
        Cleans up the file
        """
        super(SithFile, self).clean()
        if '/' in self.name:
            raise ValidationError(_("Character '/' not authorized in name"))
        if self == self.parent:
            raise ValidationError(
                _('Loop in folder tree'),
                code='loop',
            )
        if (self == self.parent or (self.parent is not None and self in self.get_parent_list())):
            raise ValidationError(
                _('Loop in folder tree'),
                code='loop',
            )
        if self.parent and self.parent.is_file:
            raise ValidationError(_('You can not make a file be a children of a non folder file'))
        if ((self.parent is None and SithFile.objects.exclude(id=self.id).filter(parent=None, name=self.name).exists()) or
                (self.parent and self.parent.children.exclude(id=self.id).filter(name=self.name).exists())):
            raise ValidationError(
                _('Duplicate file'),
                code='duplicate',
            )
        if self.is_folder:
            try:
                self.file.delete()
            except: pass
            self.file = None
            self.mime_type = "inode/directory"
        if self.is_file and (self.file is None or self.file == ""):
            raise ValidationError(_("You must provide a file"))

    def save(self, *args, **kwargs):
        copy_rights = False
        if self.id is None:
            copy_rights = True
        super(SithFile, self).save(*args, **kwargs)
        if copy_rights:
            self.copy_rights()

    def copy_rights(self):
        """Copy, if possible, the rights of the parent folder"""
        if self.parent is not None:
            self.edit_groups = self.parent.edit_groups.all()
            self.view_groups = self.parent.view_groups.all()
            self.save()

    def __getattribute__(self, attr):
        if attr == "is_file":
            return not self.is_folder
        else:
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            return super(SithFile, self).__getattribute__(attr)
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    def __str__(self):
        if self.is_folder:
            return _("Folder: ") + self.name
        else:
            return _("File: ") + self.name

    def get_parent_list(self):
        l = []
        p = self.parent
        while p is not None:
            l.append(p)
            p = p.parent
        return l

    def get_parent_path(self):
        return '/'.join([p.name for p in self.get_parent_list()])

    def get_display_name(self):
        return self.name

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    def get_download_url(self):
        return reverse('core:download', kwargs={'file_id': self.id})

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class LockError(Exception):
    """There was a lock error on the object"""
    pass

class AlreadyLocked(LockError):
    """The object is already locked"""
    pass

class NotLocked(LockError):
    """The object is not locked"""
    pass

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class Page(models.Model):
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    """
    The page class to build a Wiki
    Each page may have a parent and it's URL is of the form my.site/page/<grd_pa>/<parent>/<mypage>
    It has an ID field, but don't use it, since it's only there for DB part, and because compound primary key is
    awkward!
    Prefere querying pages with Page.get_page_by_full_name()

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    Be careful with the _full_name attribute: this field may not be valid until you call save(). It's made for fast
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    query, but don't rely on it when playing with a Page object, use get_full_name() instead!
    """
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    name = models.CharField(_('page name'), max_length=30, blank=False)
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    parent = models.ForeignKey('self', related_name="children", verbose_name=_("parent"), null=True, blank=True, on_delete=models.SET_NULL)
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    # Attention: this field may not be valid until you call save(). It's made for fast query, but don't rely on it when
    # playing with a Page object, use get_full_name() instead!
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    _full_name = models.CharField(_('page name'), max_length=255, blank=True)
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    owner_group = models.ForeignKey(Group, related_name="owned_page", verbose_name=_("owner group"),
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                                    default=settings.SITH_GROUPS['root']['id'])
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    edit_groups = models.ManyToManyField(Group, related_name="editable_page", verbose_name=_("edit group"), blank=True)
    view_groups = models.ManyToManyField(Group, related_name="viewable_page", verbose_name=_("view group"), blank=True)
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    lock_mutex = {}
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    class Meta:
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        unique_together = ('name', 'parent')
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        permissions = (
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            ("change_prop_page", "Can change the page's properties (groups, ...)"),
            ("view_page", "Can view the page"),
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        )

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    @staticmethod
    def get_page_by_full_name(name):
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        """
        Quicker to get a page with that method rather than building the request every time
        """
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        return Page.objects.filter(_full_name=name).first()
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    def __init__(self, *args, **kwargs):
        super(Page, self).__init__(*args, **kwargs)

    def clean(self):
        """
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        Cleans up only the name for the moment, but this can be used to make any treatment before saving the object
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        """
        if '/' in self.name:
            self.name = self.name.split('/')[-1]
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        if Page.objects.exclude(pk=self.pk).filter(_full_name=self.get_full_name()).exists():
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            raise ValidationError(
                _('Duplicate page'),
                code='duplicate',
            )
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        super(Page, self).clean()
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        if self.parent is not None and self in self.get_parent_list():
            raise ValidationError(
                _('Loop in page tree'),
                code='loop',
            )

    def get_parent_list(self):
        l = []
        p = self.parent
        while p is not None:
            l.append(p)
            p = p.parent
        return l

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    def save(self, *args, **kwargs):
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        """
        Performs some needed actions before and after saving a page in database
        """
        if not self.is_locked():
            raise NotLocked("The page is not locked and thus can not be saved")
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        self.full_clean()
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        # This reset the _full_name just before saving to maintain a coherent field quicker for queries than the
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        # recursive method
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        # It also update all the children to maintain correct names
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        self._full_name = self.get_full_name()
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        for c in self.children.all():
            c.save()
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        super(Page, self).save(*args, **kwargs)
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        self.unset_lock()

    def is_locked(self):
        """
        Is True if the page is locked, False otherwise
        This is where the timeout is handled, so a locked page for which the timeout is reach will be unlocked and this
        function will return False
        """
        if self.pk not in Page.lock_mutex.keys():
            # print("Page mutex does not exists")
            return False
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        if (timezone.now()-Page.lock_mutex[self.pk]['time']) > timedelta(minutes=5):
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            # print("Lock timed out")
            self.unset_lock()
            return False
        return True

    def set_lock(self, user):
        """
        Sets a lock on the current page or raise an AlreadyLocked exception
        """
        if self.is_locked() and self.get_lock()['user'] != user:
            raise AlreadyLocked("The page is already locked by someone else")
        Page.lock_mutex[self.pk] = {'user': user,
                                    'time': timezone.now()}
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        # print("Locking page")
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    def set_lock_recursive(self, user):
        """
        Locks recursively all the child pages for editing properties
        """
        for p in self.children.all():
            p.set_lock_recursive(user)
        self.set_lock(user)

    def unset_lock(self):
        """Always try to unlock, even if there is no lock"""
        Page.lock_mutex.pop(self.pk, None)
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        # print("Unlocking page")
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    def get_lock(self):
        """
        Returns the page's mutex containing the time and the user in a dict
        """
        if self.is_locked():
            return Page.lock_mutex[self.pk]
        raise NotLocked("The page is not locked and thus can not return its mutex")
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    def get_absolute_url(self):
        """
        This is needed for black magic powered UpdateView's children
        """
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        return reverse('core:page', kwargs={'page_name': self._full_name})
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    def __str__(self):
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        return self.get_full_name()

    def get_full_name(self):
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        """
        Computes the real full_name of the page based on its name and its parent's name
        You can and must rely on this function when working on a page object that is not freshly fetched from the DB
        (For example when treating a Page object coming from a form)
        """
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        if self.parent is None:
            return self.name
        return '/'.join([self.parent.get_full_name(), self.name])
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    def get_display_name(self):
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        try:
            return self.revisions.last().title
        except:
            return self.name
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class PageRev(models.Model):
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    """
    This is the true content of the page.
    Each page object has a revisions field that is a list of PageRev, ordered by date.
    my_page.revisions.last() gives the PageRev object that is the most up-to-date, and thus,
    is the real content of the page.
    The content is in PageRev.title and PageRev.content .
    """
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    revision = models.IntegerField(_("revision"))
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    title = models.CharField(_("page title"), max_length=255, blank=True)
    content = models.TextField(_("page content"), blank=True)
    date = models.DateTimeField(_('date'), auto_now=True)
    author = models.ForeignKey(User, related_name='page_rev')
    page = models.ForeignKey(Page, related_name='revisions')

    class Meta:
        ordering = ['date',]

    def get_absolute_url(self):
        """
        This is needed for black magic powered UpdateView's children
        """
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        return reverse('core:page', kwargs={'page_name': self.page._full_name})
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    def __str__(self):
        return str(self.__dict__)

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    def __getattribute__(self, attr):
        if attr == "owner_group":
            return self.page.owner_group
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        elif attr == "edit_groups":
            return self.page.edit_groups
        elif attr == "view_groups":
            return self.page.view_groups
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        elif attr == "unset_lock":
            return self.page.unset_lock
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        else:
            return object.__getattribute__(self, attr)

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    def save(self, *args, **kwargs):
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        if self.revision is None:
            self.revision = self.page.revisions.all().count() + 1
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        super(PageRev, self).save(*args, **kwargs)
        # Don't forget to unlock, otherwise, people will have to wait for the page's timeout
        self.page.unset_lock()
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