public List<GrantDTO> getForTarget(GRN target) {
        return db.find(DBQuery.is(GrantDTO.FIELD_TARGET, target.toString())).toArray();
    }
@Test
    @MongoDBFixtures("grants.json")
    public void getForTarget() {
        final GRN stream1 = grnRegistry.parse("grn::::stream:54e3deadbeefdeadbeef0000");
        final GRN stream2 = grnRegistry.parse("grn::::stream:54e3deadbeefdeadbeef0001");

        assertThat(dbService.getForTarget(stream1)).hasSize(1);
        assertThat(dbService.getForTarget(stream2)).hasSize(3);
    }