spring data - mongoTemplate embedded document insert

Is the MongoDB $push operator the way to add an embedded document?

I'm using MongoDB and Spring 3. I have the following domain object: @Document(collection = "users") public class User { @Id private String id; private List<Post> posts; } I want to add a Post to a User, but what is the best/most efficient way to do that? I can see a way to do this programmatically - find the user, add a new post object to the list and save the user again - but I don't think this is very elegant or efficient. From the documentation it seems like I need to use the $push operator but I can't seem to find any examples of how to do this with Spring's MongoTemplate. Can anyone provide an example? mongodb spring-3 mongodb-java share|improve this question asked Jun 5 '12 at 21:51 chrisjleu 788921

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up vote4down voteaccepted	$push would be the correct way to add a new document to the array. You can see example code in this presentation (slide 22). The relevant line would be: mongoTemplate.updateFirst(collection, ... new Query(where("_id").is(...)), ... new Update().push("field", dbo)); share|improve this answer answered Jun 6 '12 at 6:18 Asya Kamsky 9,192817
	2   Thanks this helped. I used the following:mongoTemplate.updateFirst(Query.query(Criteria.where("username").is("username_1‌​")), new Update().push("posts", newPostObject), User.class); I think I got a bit confused because I was trying to user the Update class statically - like i've seen done in many examples - and this did not allow the push method. – chrisjleu Jun 7 '12 at 20:50

출처 - http://stackoverflow.com/questions/10905508/is-the-mongodb-push-operator-the-way-to-add-an-embedded-document

this presentation  slide 22에서 mongoTemplate.getConverter().write()는 생략해도 된다.

중요한건 push()이다.  --> http://docs.mongodb.org/manual/reference/operator/push/