use morphia filter

service/src/main/java/com/telephoners/krakyournet/ctf/repositories/SolutionsRepository.java

@@ -25,10 +25,10 @@ public class SolutionsRepository extends Repository<Solution>
 
     public Map<Integer, List<String>> getTeamSolutions(Team team)
     {
-        //todo: use morphia filter
-        return datastore.createQuery(Solution.class).asList()
+        //todo: do not identify team by name? conflict in team ids?
+        return datastore.createQuery(Solution.class)
+                .filter("team.name",team.getName()).asList()
                 .stream()
-                .filter(solution -> solution.getTeam().equals(team))
                 .collect(Collectors.groupingBy(new Function<Solution, Task>()
                 {
                     @Override