CollectionItem: implement both update and create.
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@ -123,36 +123,31 @@ class CollectionItemSerializer(serializers.ModelSerializer):
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"""Function that's called when this serializer creates an item"""
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stoken = validated_data.pop('stoken')
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revision_data = validated_data.pop('content')
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instance = self.__class__.Meta.model(**validated_data)
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uid = validated_data.pop('uid')
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Model = self.__class__.Meta.model
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with transaction.atomic():
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if stoken is not None:
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raise serializers.ValidationError('Stoken is not None')
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instance, created = Model.objects.get_or_create(uid=uid, defaults=validated_data)
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cur_stoken = instance.stoken if not created else None
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instance.save()
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if cur_stoken != stoken:
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raise serializers.ValidationError('Wrong stoken. Expected {} got {}'.format(cur_stoken, stoken))
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if not created:
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# We don't have to use select_for_update here because the unique constraint on current guards against
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# the race condition. But it's a good idea because it'll lock and wait rather than fail.
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current_revision = instance.revisions.filter(current=True).select_for_update().first()
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current_revision.current = None
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current_revision.save()
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process_revisions_for_item(instance, revision_data)
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return instance
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def update(self, instance, validated_data):
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"""Function that's called when this serializer is meant to update an item"""
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stoken = validated_data.pop('stoken')
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revision_data = validated_data.pop('content')
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with transaction.atomic():
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if stoken != instance.stoken:
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raise serializers.ValidationError('Wrong stoken. Expected {} got {}'.format(instance.stoken, stoken))
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# We don't have to use select_for_update here because the unique constraint on current guards against
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# the race condition. But it's a good idea because it'll lock and wait rather than fail.
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current_revision = instance.revisions.filter(current=True).select_for_update().first()
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current_revision.current = None
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current_revision.save()
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process_revisions_for_item(instance, revision_data)
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return instance
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# We never update, we always update in the create method
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raise NotImplementedError()
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class CollectionItemDepSerializer(serializers.ModelSerializer):
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@ -187,8 +187,10 @@ class CollectionItemViewSet(BaseViewSet):
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# We can't have destroy because we need to get data from the user (in the body) such as hmac.
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return Response(status=status.HTTP_405_METHOD_NOT_ALLOWED)
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def update(self, request, collection_uid=None, uid=None):
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return Response(status=status.HTTP_405_METHOD_NOT_ALLOWED)
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def partial_update(self, request, collection_uid=None, uid=None):
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# FIXME: implement, or should it be implemented elsewhere?
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return Response(status=status.HTTP_405_METHOD_NOT_ALLOWED)
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def list(self, request, collection_uid=None):
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