#12890: extra() tables included twice do not generate aliases
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Reporter: semenov | Owner: nobody
Status: new | Milestone:
Component: Database layer (models, ORM) | Version: 1.1
Keywords: | Stage: Unreviewed
Has_patch: 0 |
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The documentation at
http://docs.djangoproject.com/en/1.1/ref/models/querysets/#extra-select-
none-where-none-params-none-tables-none-order-by-none-select-params-none
says: "When you add extra tables via the tables parameter, Django assumes
you want that table included an extra time, if it is already included.
That creates a problem, since the table name will then be given an alias."
That is not true even for simple cases:
{{{
#!python
print User.objects\
.extra(tables=['auth_user_group'],
where=['auth_user.ud=auth_user_group.user_id'])\
.extra(tables=['auth_user_group'],
where=['auth_user.ud=auth_user_group.user_id']).all()
# crashes with OperationalError(1066, "Not unique table/alias:
'auth_user_group'")
}}}
This is a real-life example (with different models, of course) from my
project. I have to run an extra() query against the same table ''twice''
to achieve the double filtration, but it's not working and doesn't even
allow me to specify the aliases manually. A usual double filter() trick
would probably work but it is also broken due to #12885.
--
Ticket URL: <http://code.djangoproject.com/ticket/12890>
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