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Location: symposion_app/symposion/proposals/managers.py - annotation
96596dc5ddb2
1.1 KiB
text/x-python
Update and rename README.md to README.rst
7596922f4d68 7596922f4d68 7596922f4d68 7596922f4d68 7596922f4d68 7596922f4d68 7596922f4d68 7596922f4d68 7596922f4d68 7596922f4d68 7596922f4d68 7596922f4d68 7596922f4d68 7596922f4d68 7596922f4d68 7596922f4d68 7596922f4d68 7596922f4d68 7596922f4d68 7596922f4d68 7596922f4d68 7596922f4d68 7596922f4d68 7596922f4d68 7596922f4d68 7596922f4d68 7596922f4d68 | from django.db import models
from django.db.models.query import QuerySet
class CachingM2MQuerySet(QuerySet):
def __init__(self, *args, **kwargs):
super(CachingM2MQuerySet, self).__init__(*args, **kwargs)
self.cached_m2m_field = kwargs["m2m_field"]
def iterator(self):
parent_iter = super(CachingM2MQuerySet, self).iterator()
m2m_model = getattr(self.model, self.cached_m2m_field).through
for obj in parent_iter:
if obj.id in cached_objects:
setattr(obj, "_cached_m2m_%s" % self.cached_m2m_field)
yield obj
class ProposalManager(models.Manager):
def cache_m2m(self, m2m_field):
return CachingM2MQuerySet(self.model, using=self._db, m2m_field=m2m_field)
AdditionalSpeaker = queryset.model.additional_speakers.through
additional_speakers = collections.defaultdict(set)
for additional_speaker in AdditionalSpeaker._default_manager.filter(proposal__in=queryset).select_related("speaker__user"):
additional_speakers[additional_speaker.proposal_id].add(additional_speaker.speaker)
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