def existing_node_check(self):
"""Make sure no other nodes exist at the level of this CNAME.
"If a CNAME RR is present at a node, no other data should be
present; this ensures that the data for
a canonical name and its aliases cannot be different."
-- `RFC 1034 <http://tools.ietf.org/html/rfc1034>`_
For example, this would be bad::
FOO.BAR.COM CNAME BEE.BAR.COM
BEE.BAR.COM A 128.193.1.1
FOO.BAR.COM TXT "v=spf1 include:foo.com -all"
If you queried the ``FOO.BAR.COM`` name, the class of the record
that would be returned would be ambiguous.
.. note::
The following records classes are checked.
* :class:`AddressRecord` (A and AAAA)
* :class:`SRV`
* :class:`TXT`
* :class:`MX`
"""
qset = fqdn_exists(self.fqdn, cn=False, dn=False, pt=False)
if qset:
objects = qset.all()
raise ValidationError("Objects with this name already exist: {0}".
format(objects))
def clean(self):
self.master_domain = _name_to_master_domain(self.name)
do_zone_validation(self)
if self.pk is None:
# The object doesn't exist in the db yet. Make sure we don't
# conflict with existing objects.
qset = fqdn_exists(self.name, pt=False)
if qset:
objects = qset.all()
raise ValidationError("Objects with this name already " "exist {0}".format(objects))