#24414: Add example of Prefetch object usage to docs
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Reporter: coolRR | Owner: nobody
Type: New feature | Status: new
Component: Documentation | Version: 1.7
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by sww):
Here's my stab at an example:
{{{
>>>
Question.objects.prefetch_related(Prefetch('choice_set')).get().choice_set.all()
[<Choice: Not much>, <Choice: The sky>, <Choice: Just hacking again>]
>>> voted_choices = Choice.objects.filter(votes__gt=0)
>>> voted_choices
[<Choice: The sky>]
>>> Question.objects.prefetch_related(Prefetch('choice_set',
queryset=voted_choices)).get().choice_set.all()
[<Choice: The sky>]
# Providing the to_attr value will preserve the choice_set results.
>>> Question.objects.prefetch_related(Prefetch('choice_set',
queryset=voted_choices, to_attr='voted_choices')).get().voted_choices
[<Choice: The sky>]
>>> Question.objects.prefetch_related(Prefetch('choice_set',
queryset=voted_choices, to_attr='voted_choices')).get().choice_set.all()
[<Choice: Not much>, <Choice: The sky>, <Choice: Just hacking again>]
}}}
Feedback?
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Ticket URL: <https://code.djangoproject.com/ticket/24414#comment:3>
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