public Set<ContentPack> findAllById(ModelId id) {
        final DBCursor<ContentPack> result = dbCollection.find(DBQuery.is(Identified.FIELD_META_ID, id));
        return ImmutableSet.copyOf((Iterable<ContentPack>) result);
    }
@Test
    @MongoDBFixtures("ContentPackPersistenceServiceTest.json")
    public void findAllById() {
        final Set<ContentPack> contentPacks = contentPackPersistenceService.findAllById(ModelId.of("dcd74ede-6832-4ef7-9f69-deadbeef0000"));

        assertThat(contentPacks)
                .hasSize(3)
                .allMatch(contentPack -> contentPack.id().equals(ModelId.of("dcd74ede-6832-4ef7-9f69-deadbeef0000")));
    }