MongoDB Aggregation in custom Spring Data #Query - annotations

Question

Anyone know how to shoehorn MongoDB aggregate queries into spring-data custom #Query?
I would like to group my entities and retrieve all the latest version by date.
The aggregate query is
db.collection.aggregate(
[
{ $sort: { url: 1, checkedOn: 1 } },
{
$group: {
_id: {url: "$url", path: "$path" },
lastChecked: { $last: "$checkedOn" }
}
}
])
This runs fine and returns a collection like this:
{
"result" : [
{
"_id" : {
"url" : "http://www.google.co.uk",
"path" : "/about"
},
"lastChecked" : ISODate("2015-03-17T11:43:01.222Z")
},
{
"_id" : {
"url" : "http://www.google.co.uk",
"path" : "/about2"
},
"lastChecked" : ISODate("2015-03-17T11:43:04.213Z")
}
],
"ok" : 1
}
I'd like to do this as part of a spring-data custom query:
#RepositoryRestResource(collectionResourceRel = "healthcheck", path = "healthcheck")
public interface LinkRepository extends MongoRepository<Link, String> {
#Query("{ 'status' : { $gt: 299 }, 'path' : ?0 }" )
List<CheckedLink> findByPathAndInvalid(#Param("path") String path);
#Query(**aggregate query goes here**)
List<CheckedLink> findByLatest();
}
I can't put the aggregate query directly into #Query because the resulting collection is not directly mapped to the Link object.
Only reference I can find is on an old Spring-Sandbox project but this has not been updated since 2013:
https://github.com/hantsy/spring-sandbox/wiki/spring-data-mongo#custom-query

Answer 1

The #Query annotation can be only used to fill the query part of a mongo request. As other annotation classes are CountQuery, DeleteQuery and ExistsQuery, I assume that this is not possible using an annotation.