Adapted changes in Spring Data Commons. Adapted test cases accordingly. Introduced SimpleMongoMappingContext that that reflects the meta-model assumptions in SimpleMongoConverter. Adapted repository factories accordingly as we can now assume that there is a MappingContext available always.
Refactored QueryMapper to be stateless so that we don't need to recreate instances of it. Added unit tests to verify id property to key mapping and type conversion to ObjectId.
Polished MappingTests to simply drop the database after all test were finished to make sure it starts with a clean state on a potential next run.
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