Spring mongo : How to customize _id without VO?

Question

I am working with MongoDB and Spring 3.2.8.

What I have to do is query to Oracle database with MyBatis and put the ResultMap which returns from the query into Mongo DB.

Situations.

• ResultMap works quite well as I expected. It returns proper HashMap<String, Object> or List<HashMap<String, Object>

• In that ResultMap, I have an element named 'service_id' which should replace '_id' in mongo.

• Push into mongoDB with MongoTemplate(org.springframework.data.mongo.core) works also well.

• The problem is since mongoDB uses its own '_id' as a primary key, if I put same object it sizes double.

Question.

• How can I use 'service_id' as a primary key of mongo?

Condition.

• Do not use VO.(It means I can not use @id as mongo as described here : http://docs.spring.io/spring-data/data-mongodb/docs/1.0.0.M5/reference/html/#d0e1508)

Part of Source code. tmp.insert(map, collectionName); this tmp is MongoTemplate and I assume that it does not have any method to control '_id'.

Thank you :D

Answer 1

Simple solution but I think it is Orthodox way.

• Put an element into the ReturnMap. e.g. map.put("_id", map.get("service_id"));

Now, I can prevent duplication of values.

If there is better way, I will choose that one as an answer :D Thanks