#34130 closed Bug (invalid)
order_by() has no effect on values()/values_list()
Reported by: | Michal Dabski | Owned by: | nobody |
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Component: | Database layer (models, ORM) | Version: | 3.2 |
Severity: | Normal | Keywords: | queryset, ordering, values, values_list |
Cc: | Triage Stage: | Unreviewed | |
Has patch: | no | Needs documentation: | no |
Needs tests: | no | Patch needs improvement: | no |
Easy pickings: | no | UI/UX: | no |
Description (last modified by )
I have encounteded a bug with a model that has default ordering. I am making a query with order_by()
without parameters to avoid ordering and then use values()
or values_list()
to extract a subset of fields. The end result is an ordered queryset.
It appears that values()
restores model's default ordering if called after order_by()
, except if queryset is already ordered by cystom ordering (e.g. order_by('name')
), in which case order_by is maintained.
Django 3.2.16
The model:
class Dashboard(models.Model): name = models.CharField(max_length=100) order = models.PositiveIntegerField(default=1) class Meta: ordering = 'order',
Note: it is important that the model defineds ordering
To reproduce issue:
# Queryset is ordered by default field as expected ✔ Dashboard.objects.all().values('name').ordered Out[44]: True # Queryset is not ordered after adding order_by() as expected ✔ Dashboard.objects.all().order_by().ordered Out[54]: False # adding values() call somehow restores default ordering. Expected behaviour is for QS to remain unordered ✖ Dashboard.objects.all().order_by().values('name').ordered Out[42]: True # placing order_by() after values() works as expected ✔ Dashboard.objects.all().values('name').order_by().ordered Out[48]: False
In my case I am using order_by() to avoid using JOIN in the query when I know that order does not matter, but resulting query does make a join unbeknownst to me and makes the more complex ordered query.
The documentation for values/values_list and order_by does not appear to mention this behaviour so I am assuming it is not intentional.
Change History (4)
comment:1 by , 2 years ago
Description: | modified (diff) |
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comment:2 by , 2 years ago
Resolution: | → needsinfo |
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Status: | new → closed |
comment:3 by , 2 years ago
My bad, the model uses modeltranslation library, but its not immediately obvious by looking at the queryset class. I will raise the issue with the library maintainer.
comment:4 by , 2 years ago
Resolution: | needsinfo → invalid |
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Thanks for this report, however I cannot reproduce this issue on Django 3.2.16, 4.0.x, 4.1.x, or on the current
main
branch. Please reopen the ticket if you can debug your issue and provide a sample project that reproduces this issue.