Viewing file:  replace_delete_new.py (1.39 KB) -rw-r--r--
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# -*- test-case-name: axiom.test.test_upgrading.DuringUpgradeTests.test_cascadingDeletedReferenceModifiedByForeignUpgrader -*-
from axiom.attributes import reference, integer
from axiom.item import Item, normalize
from axiom.upgrade import registerUpgrader
NEW_VALUE = 71
class Referrer(Item):
"""
An item which just refers to another kind of item which will be upgraded.
"""
# Don't import the old schema. -exarkun
typeName = normalize(
"axiom.test.upgrade_fixtures.replace_delete_old.Referrer")
referee = reference(whenDeleted=reference.CASCADE)
class Referee(Item):
"""
An item the upgrader of which replaces itself on L{Referrer} with a new
instance with a different value.
"""
# Don't import the old schema. -exarkun
typeName = normalize(
"axiom.test.upgrade_fixtures.replace_delete_old.Referee")
schemaVersion = 2
value = integer()
def referee1to2(oldReferee):
"""
Find the L{Referrer} which refers to C{oldReferee} and replace its
C{referee} attribute with a new, different L{Referee} item with a different
C{value}, and which deletes the original L{Referee}.
"""
store = oldReferee.store
[referrer] = list(store.query(Referrer, Referrer.referee == oldReferee))
referrer.referee = Referee(store=store, value=NEW_VALUE)
oldReferee.deleteFromStore()
registerUpgrader(referee1to2, Referee.typeName, 1, 2)
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