#22553: Add ability to refresh queryset
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Reporter: giggaflop@… | Owner: nobody
Type: New feature | Status: new
Component: Database layer (models, ORM) | Version: 1.6
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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I propose adding a Queryset method '.refresh()' which will clear the
built-in cache on any queryset passed to it.
I suggest an initial implementation of:
{{{
def refresh(self, *args, **kwargs):
"""
Returns a new QuerySet instance with the args ANDed to the
existing
set.
"""
self._result_cache = None
return self
}}}
Reason this is requested:
When I'm using modelformsets I typically find the need to refresh the
queryset that is used by the ModelFormset.
To do this I perform the following action:
{{{
updated_formset = ConciergeUserPoolFormset(request.POST)
if updated_formset.is_valid():
updated_formset.save()
queryset = updated_formset.get_queryset()
# we need an updated queryset, not the cached version. set the
results cache to None to force re-fetch
queryset._result_cache = None
updated_formset = ConciergeUserPoolFormset(queryset=queryset)
}}}
This is not an obvious solution to the issue of updating a ModelFormset or
forcing a queryset update in general, it also uses a private method of the
Queryset object which I would prefer to avoid.
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Ticket URL: <https://code.djangoproject.com/ticket/22553>
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