On Dec 16, 2007, at 3:16 PM, [EMAIL PROTECTED] wrote:
>
>>> not sure what the three get_history sublists are for...
>>
>>
>> (added, unchanged, deleted) =
>> attributes.get_history(myinstance._state, 'someattribute')
>>
>> three lists will never be None unless you call get_history() with
>> passive=True and lazyload would be needed.
> in a scalar context, what (added, unchanged, deleted) mean?
> setattr->added
> delattr->deleted
> ? so the old value is (deleted or unchanged)[0]?
i have really nice unit tests now that illustrate the whole thing in
test/orm/attributes.py HistoryTest:
attributes.register_class(Foo)
attributes.register_attribute(Foo, 'someattr', uselist=False,
useobject=False)
f = Foo()
self.assertEquals(attributes.get_history(f._state,
'someattr'), ([], [], []))
f.someattr = "hi"
self.assertEquals(attributes.get_history(f._state,
'someattr'), (['hi'], [], []))
f._state.commit(['someattr'])
self.assertEquals(attributes.get_history(f._state,
'someattr'), ([], ['hi'], []))
f.someattr = 'there'
self.assertEquals(attributes.get_history(f._state,
'someattr'), (['there'], [], ['hi']))
f._state.commit(['someattr'])
self.assertEquals(attributes.get_history(f._state,
'someattr'), ([], ['there'], []))
del f.someattr # oops, svn up to r3952
self.assertEquals(attributes.get_history(f._state,
'someattr'), ([], [], ['there']))
if the attribute is an object reference, you might have [None] instead
of [] for added/unchanged if theres no value.
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"sqlalchemy" group.
To post to this group, send email to sqlalchemy@googlegroups.com
To unsubscribe from this group, send email to [EMAIL PROTECTED]
For more options, visit this group at
http://groups.google.com/group/sqlalchemy?hl=en
-~----------~----~----~----~------~----~------~--~---
