Re: Prepopulate blog in b.entry_set.all()[i].blog ?

It seems to be a bug as reported in https://code.djangoproject.com/ticket/29908. The ForeignKey must use to_field to reproduce the problem.

On Saturday, October 20, 2018 at 4:38:51 AM UTC-4, Carsten Fuchs wrote:

Can anyone help please?

Am 2018-10-11 um 16:58 schrieb Carsten Fuchs:
> Dear Django group,
>
> with Django 1.11.15, using the example models Blog and Entry at
> <https://docs.djangoproject.com/en/2.1/topics/db/queries/#related-objects>
> for reference, I have code like this:
>
>      b = Blog.objects.get(name="...")
>      for e in b.entry_set.all():
>          print(e.blog)
>
> Obviously, e.blog == b, but I found that for each e, the access to
> e.blog causes a subquery to fetch the blog object.
>
> While I understand the concepts of select_related() and
> prefetch_related(), I was surprised that the e.blog attributes are not
> prepopulated with b. Why is that and what is the proper way to fix the
> problem?
>
> Best regards,
> Carsten
>

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