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77 lines
2.5 KiB
77 lines
2.5 KiB
from django.contrib.contenttypes.fields import GenericRelation |
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from django.contrib.contenttypes.models import ContentType |
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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, rel='all'): |
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if rel == 'all': |
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return cls._get_filter_res_by_labels_m2m_all(resources, label_ids) |
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else: |
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return cls._get_filter_res_by_labels_m2m_in(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')) \ |
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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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res_type = ContentType.objects.get_for_model(cls.label_model()) |
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resources = LabeledResource.objects.all().filter(res_type=res_type) |
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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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