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44 lines
1.4 KiB
44 lines
1.4 KiB
from uuid import UUID
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from rest_framework.fields import get_attribute
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from rest_framework.relations import ManyRelatedField, PrimaryKeyRelatedField, MANY_RELATION_KWARGS
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class GroupConcatedManyRelatedField(ManyRelatedField):
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def get_attribute(self, instance):
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if hasattr(instance, 'pk') and instance.pk is None:
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return []
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attr = self.source_attrs[-1]
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# `gc` 是 `GroupConcat` 的缩写
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gc_attr = f'gc_{attr}'
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if hasattr(instance, gc_attr):
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gc_value = getattr(instance, gc_attr)
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if isinstance(gc_value, str):
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return [UUID(pk) for pk in set(gc_value.split(','))]
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else:
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return ''
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relationship = get_attribute(instance, self.source_attrs)
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return relationship.all() if hasattr(relationship, 'all') else relationship
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class GroupConcatedPrimaryKeyRelatedField(PrimaryKeyRelatedField):
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@classmethod
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def many_init(cls, *args, **kwargs):
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list_kwargs = {'child_relation': cls(*args, **kwargs)}
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for key in kwargs:
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if key in MANY_RELATION_KWARGS:
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list_kwargs[key] = kwargs[key]
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return GroupConcatedManyRelatedField(**list_kwargs)
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def to_representation(self, value):
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if self.pk_field is not None:
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return self.pk_field.to_representation(value.pk)
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if hasattr(value, 'pk'):
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return value.pk
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else:
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return value
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