Maybe https://code.djangoproject.com/ticket/25546 fixes it? This will be in
Django 1.10.
On Friday, February 12, 2016 at 10:18:22 PM UTC-5, Dheerendra Rathor wrote:
>
> Hello,
>
> Recently I was monitoring db queries created by Django and a particular
> block was behaving unusual.
> Here is the code block:
>
> from django.db import connection, reset_queries
> reset_queries()
> group = get_object_or_404(
> Group.objects.select_related('course').prefetch_related(
> Prefetch(
> 'concepts',
>
> queryset=Concept.objects.filter(is_published=True).prefetch_related(
> 'videos', 'pages',
> ),
> ),
> ).only('course', 'playlist'),
> pk=pk,
> )
>
> s4 = connection.queries
> k4 = len(s4)
> reset_queries()
>
>
>
> Now, the interesting part is that prefetch queries are made twice for
> videos and pages. Hereis the query dump https://paste.kde.org/psrp4orn6
>
> It is making same queries twice with exactly same parameters.
>
> Can someone please explain it for me? In my view, it should not happen.
> I'm missing something here?
>
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