code: public Response findByIds(@NotNull @PathParam("ids") URI_ID id,
                                @NotNull @PathParam("ids") final PathSegment ids,
                                @QueryParam("include_deleted") final boolean includeDeleted) throws Exception {
          final Query<MODEL> query = server.find(modelType);
          final MODEL_ID firstId = tryConvertId(ids.getPath());
          Set<String> idSet = ids.getMatrixParameters().keySet();
          final Set<MODEL_ID> idCollection = Sets.newLinkedHashSet();
          idCollection.add(firstId);
          if (!idSet.isEmpty()) {
              idCollection.addAll(Collections2.transform(idSet, this::tryConvertId));
          }
          matchedFindByIds(firstId, idCollection, includeDeleted);
          Object model;
          if (includeDeleted) {
              query.setIncludeSoftDeletes();
          }
          final TxRunnable configureQuery = t -> {
              configDefaultQuery(query);
              configFindByIdsQuery(query, includeDeleted);
              applyUriQuery(query, false);
          };
          if (!idSet.isEmpty()) {
              model = executeTx(t -> {
                  configureQuery.run(t);
                  List<MODEL> m = query.where().idIn(idCollection.toArray()).findList();
                  return processFoundByIdsModelList(m, includeDeleted);
              });
          } else {
              model = executeTx(t -> {
                  configureQuery.run(t);
                  MODEL m = query.setId(firstId).findOne();
                  return processFoundByIdModel(m, includeDeleted);
              });
          }
  
          if (isEmptyEntity(model)) {
              throw new NotFoundException();
          }
          return Response.ok(model).build();
      }
docs: Find a model or model list given its Ids.
  
  @param id             The id use for path matching type
  @param ids            the id of the model.
  @param includeDeleted a boolean.
  @return a {@link javax.ws.rs.core.Response} object.
  @throws java.lang.Exception if any.
  @see javax.ws.rs.GET
  @see AbstractModelResource#findByIds