I'd like to restrict deletion and updates on an object based on the boolean
attribute 'locked' on the same object.
I've managed to successfully suppress updates but it doesn't seem to work
for deletes with the following code.
@listen_for(mapper, 'mapper_configured')
def mapper_configured(mapper, cls):
def extract(obj):
try: return obj[0]
except IndexError: return False
if issubclass(cls, Base):
@listen_for(cls, 'before_update)
@listen_for(cls, 'before_delete)
def restrict(mapper, connection, target):
session = Session.object_session(target)
added, unchanged, deleted = map(extract,
inspect(target).attrs.locked.history)
if unchanged:
session.expire(target)
How can I make SA restrict the delete and keep object in database when a
session.delete(obj) is issued?
Any help appreciated,
Mats
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