From mongoengine-odm.readthedocs.org:
Added FutureWarning to inherited classes not declaring 'allow_inheritance' as the default will change in 0.7Added support for covered indexes when inheritance is offNo longer always upsert on save for items with a '_id'Error raised if update doesn't have an operationDeReferencing is now thread safeErrors raised if trying to perform a join in a queryUpdates can now take __raw__ queriesAdded custom 2...
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