Adds delete-orphan to database deletion.
Change-Id: I3570c812c042365e68eef3b5463899afa85eb9fd Fixes: bug #1096549
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@ -145,10 +145,10 @@ class Subnet(model_base.BASEV2, HasId, HasTenant):
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enable_dhcp = sa.Column(sa.Boolean())
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dns_nameservers = orm.relationship(DNSNameServer,
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backref='subnet',
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cascade='delete')
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cascade='all, delete, delete-orphan')
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routes = orm.relationship(SubnetRoute,
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backref='subnet',
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cascade='delete')
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cascade='all, delete, delete-orphan')
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shared = sa.Column(sa.Boolean)
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