Refactor #727
Updated by bmbouter about 9 years ago
See the "conversion guide":https://fedorahosted.org/pulp/wiki/ConvertingModelsToMongoengine#StepsinvolvedinconvertingaPulpmodeltoMongoEngine for details on what to do for this.
This has a strict requirement that all operations be done atomically and there are no race conditions.
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