#32704: QuerySet.defer() doesn't clear deferred field when chaining with only().
-------------------------------------+-------------------------------------
Reporter: Manuel Baclet | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 3.1
(models, ORM) |
Severity: Normal | Resolution:
Keywords: defer only | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by Manuel Baclet):
With the proposed patch, I think that:
{{{#!python
Company.objects.only("name").defer("name", "country")
}}}
loads all fields whereas:
{{{#!python
Company.objects.only("name").defer("name").defer("country")
}}}
loads all fields except `"country"`.
Why is that?
In the first case:
{{{#!python
existing.difference(field_names) == {"name"}.difference(["name",
"country"]) == empty_set
}}}
and we go into the `if` branch clearing all the deferred fields and we are
done.
In the second case:
{{{#!python
existing.difference(field_names) == {"name"}.difference(["name"]) ==
empty_set
}}}
and we go into the `if` branch clearing all the deferred fields. Then we
add `"country"` to the set of deferred fields.
--
Ticket URL: <https://code.djangoproject.com/ticket/32704#comment:7>
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