Pull Request: https://github.com/edx/edx-platform/pull/7258
Description
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DjangoKeyValueStore.set_many was causing multiple writes whenever it saved data for a newly created XBlock. It called FieldDataCache.find_or_create which, if the block wasn't cached, did a get_or_create call to create it. Then DjangoKeyValueStore immediately called save on that block. This results in both an insert of empty state, and then an update of that record. This change means that FieldDataCache no longer calls get_or_create and instead just returns a new, in-memory django model object, which is then saved by DjangoKeyValueStore.
Results