Opened 11 years ago

Closed 11 years ago

Last modified 11 years ago

#19426 closed Bug (fixed)

EmptyQuerySet.distinct does not have the same signature as QuerySet.distinct()

Reported by: anonymous Owned by: Claude Paroz
Component: Database layer (models, ORM) Version: dev
Severity: Normal Keywords:
Cc: Benjamin Dauvergne, hongshuning@… Triage Stage: Ready for checkin
Has patch: yes Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: yes UI/UX: no


QuerySet.distinct is:

    def distinct(self, *field_names):

but EmptyQuerySet.distinct is :

    def distinct(self, fields=None):

when called like this:

    qs = qs.distinct('field1', 'field2')

if qs is empty then it raises:

TypeError: distinct() takes at most 2 arguments (3 given)

Attachments (1)

19426.diff (1.1 KB ) - added by Hong Shuning 11 years ago.

Download all attachments as: .zip

Change History (10)

comment:1 by Benjamin Dauvergne, 11 years ago

Cc: Benjamin Dauvergne added

comment:2 by Preston Holmes, 11 years ago

Component: UncategorizedDatabase layer (models, ORM)
Easy pickings: set
Triage Stage: UnreviewedAccepted
Type: UncategorizedCleanup/optimization

Easy enough to keep the fields kwarg while allowing *args as this is essentially a noop for EmptyQuerySet

comment:3 by Claude Paroz, 11 years ago

Owner: changed from nobody to Claude Paroz
Type: Cleanup/optimizationBug

bdauvergne, you are the reporter, right?

by Hong Shuning, 11 years ago

Attachment: 19426.diff added

comment:4 by Hong Shuning, 11 years ago

Cc: hongshuning@… added
Has patch: set

I have fixed this bug, please check.

comment:5 by Simon Charette, 11 years ago

Triage Stage: AcceptedReady for checkin

@claudep, looking at #6422 it seems the chosen approach was ignoring the fields kwarg altogether. I think we should stick to that here also.

All queries tests pass on Python 2.7.3 SQlite so I'm marking as RFC.

comment:6 by Anssi Kääriäinen, 11 years ago

There is another ticket which does a larger refactor of the emptyqs class, see

comment:7 by Claude Paroz <claude@…>, 11 years ago

Resolution: fixed
Status: newclosed

In a893ee3315d6a134b46ff8c36c44a8efbbe34886:

Fixed #19426 -- Adapted EmptyQuerySet.distinct signature

1.5-only change, as EmptyQuerySet will be refactored in 1.6.
Thanks hongshuning@… for the patch.

comment:8 by Claude Paroz, 11 years ago

I committed the fix without the test, as #19184 will probably remove this part anyway.

comment:9 by Anssi Kääriäinen <akaariai@…>, 11 years ago

In 69a46c5ca7d4e6819096af88cd8d51174efd46df:

Tests for various emptyqs tickets

The tickets are either about different signature between qs.none() and
qs or problems with subclass types (either EmptyQS overrided the custom
qs class, or EmptyQS was overridden by another class - values() did

Fixed #15959, fixed #17271, fixed #17712, fixed #19426

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