#29567: It raise FieldError when the F() function uses a forign key field.
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Reporter: HongWeipeng | Owner: nobody
Type: Bug | Status: new
Component: Uncategorized | Version: 2.0
Severity: Normal | Resolution:
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Description changed by HongWeipeng:
Old description:
> ```
> class B(models.Model):
> name = models.CharField(max_length=10)
>
> class A(models.Model):
> name = models.CharField(max_length=10)
> b = models.ForeignKey('B', on_delete=models.CASCADE)
> ```
> And then:
> ```
> A.objects.all().update(name=F('b__name'))
>
> raise FieldError("Joined field references are not permitted in this
> query")
> django.core.exceptions.FieldError: Joined field references are not
> permitted in this query
> ```
New description:
{{{#!python
class B(models.Model):
name = models.CharField(max_length=10)
class A(models.Model):
name = models.CharField(max_length=10)
b = models.ForeignKey('B', on_delete=models.CASCADE)
}}}
And then:
{{{#!python
A.objects.all().update(name=F('b__name'))
raise FieldError("Joined field references are not permitted in this
query")
django.core.exceptions.FieldError: Joined field references are not
permitted in this query
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/29567#comment:1>
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