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73 lines
2.2 KiB
73 lines
2.2 KiB
from django.contrib.contenttypes.fields import GenericRelation
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from django.db import models
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from django.db.models import OneToOneField, Count
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from common.utils import lazyproperty
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from .models import LabeledResource
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__all__ = ['LabeledMixin']
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class LabeledMixin(models.Model):
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labels = GenericRelation(LabeledResource, object_id_field='res_id', content_type_field='res_type')
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class Meta:
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abstract = True
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@classmethod
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def label_model(cls):
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pk_field = cls._meta.pk
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model = cls
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if isinstance(pk_field, OneToOneField):
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model = pk_field.related_model
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return model
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@lazyproperty
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def real(self):
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pk_field = self._meta.pk
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if isinstance(pk_field, OneToOneField):
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return getattr(self, pk_field.name)
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return self
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@property
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def res_labels(self):
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return self.real.labels
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@res_labels.setter
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def res_labels(self, value):
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self.real.labels.set(value, bulk=False)
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@classmethod
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def filter_resources_by_labels(cls, resources, label_ids):
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return cls._get_filter_res_by_labels_m2m_all(resources, label_ids)
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@classmethod
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def _get_filter_res_by_labels_m2m_in(cls, resources, label_ids):
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return resources.filter(label_id__in=label_ids)
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@classmethod
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def _get_filter_res_by_labels_m2m_all(cls, resources, label_ids):
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if len(label_ids) == 1:
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return cls._get_filter_res_by_labels_m2m_in(resources, label_ids)
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resources = resources.filter(label_id__in=label_ids) \
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.values('res_id') \
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.order_by('res_id') \
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.annotate(count=Count('res_id', distinct=True)) \
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.values('res_id', 'count') \
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.filter(count=len(label_ids))
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return resources
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@classmethod
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def get_labels_filter_attr_q(cls, value, match):
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resources = LabeledResource.objects.all()
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if not value:
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return None
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if match != 'm2m_all':
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resources = cls._get_filter_res_by_labels_m2m_in(resources, value)
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else:
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resources = cls._get_filter_res_by_labels_m2m_all(resources, value)
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res_ids = set(resources.values_list('res_id', flat=True))
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return models.Q(id__in=res_ids)
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