问题
For Java enum type, I learn that there are two solutions for MongoDB: serialization and using Jackson’s ObjectMapper. Can the MongoRepository work with an enum data type with either of those approaches or I have to write a customized repository?
回答1:
Yes, Spring Data MongoDB supports enums. Just use them in your domain model.
回答2:
Spring Data Mongodb can serialize enum into string using enum's name as value. Let's say, it uses the second approach from the article http://www.vineetmanohar.com/2010/01/3-ways-to-serialize-java-enums/. IMHO this can't be taken seriously, because the only correct way to store enums in the database is the approach #3 from the same article, let me cite it: "This approach involves assigning a an explicit user defined value to each enum constant and defining a toValue() and fromValue() methods on the enum to do the serialization and deserialization.". So, Spring Data Mongodb does not support enums.
来源：https://stackoverflow.com/questions/28972455/does-spring-data-mongodb-support-enums