How to frame a query using @Query annotation?

Question

Is there any way to represent below query using spring-data mongo @Query annotation.

db.users.find({userName: "titogeo"}, {requests: 1, _id:0})

The above query output in console is

requests" : [{"who" : "blahblahblah1",
"whom" : "blahblahblah2",
"what" : "REQUEST",
"when" : ISODate("2012-09-05T17:52:14.339Z") } ] }

I tried the following but did not work.

@Query("{userName: ?0}, {requests:1, _id:0}")
public Page<AddRequest> getAllFriendRequests(String userName, Pageable pageable);

Collection users has User objects and requests is a list in it contains AddRequest objects.

When I execute the above method, i am getting a blank list. Any help is appreciated.

Also is there any good reference sites or books for spring-data-mongo apis?

Answer 1

Since you are using the filter property to restrict the set of properties that get returned (just requests), you need to use the property keywords in the following syntax:

@Query(value = "{ 'userName' : ?0 }", fields = "{ 'requests': 1, '_id': 0 }")
public Page<AddRequest> getAllFriendRequests(String userName, Pageable pageable);

Here is a helpful site for spring-data mongodb: http://static.springsource.org/spring-data/data-document/docs/current/reference/html/