public long countInstallationOfEntityByIdAndFoundOnSystem(ModelId entityId) { final DBQuery.Query query = DBQuery.elemMatch(ContentPackInstallation.FIELD_ENTITIES, DBQuery.and( DBQuery.is(NativeEntityDescriptor.FIELD_ENTITY_FOUND_ON_SYSTEM, true), DBQuery.is(NativeEntityDescriptor.FIELD_META_ID, entityId.id()))); return dbCollection.getCount(query); } }