Implement collection updating.
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@ -197,3 +197,19 @@ class CollectionSerializer(serializers.ModelSerializer):
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).save()
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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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revision_data = validated_data.pop('content')
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with transaction.atomic():
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main_item = instance.mainItem
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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 = main_item.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(main_item, revision_data)
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return instance
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