/usr/lib/python2.7/dist-packages/maasserver/models/zone.py is in python-django-maas 1.5.4+bzr2294-0ubuntu1.2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 | # Copyright 2013-2014 Canonical Ltd. This software is licensed under the
# GNU Affero General Public License version 3 (see the file LICENSE).
"""Physical zone objects."""
from __future__ import (
absolute_import,
print_function,
unicode_literals,
)
str = None
__metaclass__ = type
__all__ = [
"DEFAULT_ZONE_NAME",
"Zone",
"ZONE_NAME_VALIDATOR",
]
import datetime
from django.core.exceptions import ValidationError
from django.core.validators import RegexValidator
from django.db.models import (
CharField,
Manager,
TextField,
)
from maasserver import DefaultMeta
from maasserver.models.cleansave import CleanSave
from maasserver.models.timestampedmodel import TimestampedModel
ZONE_NAME_VALIDATOR = RegexValidator('^[\w-]+$')
# Name of the special, default zone. This zone can be neither deleted nor
# renamed.
DEFAULT_ZONE_NAME = 'default'
class ZoneManager(Manager):
"""Manager for :class:`Zone` model.
Don't import or instantiate this directly; access as `<Class>.objects` on
the model class it manages.
"""
def get_default_zone(self):
"""Return the default zone."""
now = datetime.datetime.now()
zone, _ = self.get_or_create(
name=DEFAULT_ZONE_NAME,
defaults={
'name': DEFAULT_ZONE_NAME,
'created': now,
'updated': now,
}
)
return zone
class Zone(CleanSave, TimestampedModel):
"""A `Zone` is an entity used to logically group nodes together.
:ivar name: The short-human-identifiable name for this zone.
:ivar description: Free-form description for this zone.
:ivar objects: An instance of the class :class:`ZoneManager`.
"""
class Meta(DefaultMeta):
"""Needed for South to recognize this model."""
verbose_name = "Physical zone"
verbose_name_plural = "Physical zones"
ordering = ["name"]
objects = ZoneManager()
name = CharField(
max_length=256, unique=True, editable=True,
validators=[ZONE_NAME_VALIDATOR])
description = TextField(blank=True, editable=True)
def __unicode__(self):
return self.name
def is_default(self):
"""Is this the default zone?"""
return self.name == DEFAULT_ZONE_NAME
def delete(self):
if self.is_default():
raise ValidationError(
"This zone is the default zone, it cannot be deleted.")
super(Zone, self).delete()
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