Fix issue when folderId of getElements is null

Author: Thomasr

server/api-service/lowcoder-server/src/main/java/org/lowcoder/api/home/FolderController.java

@@ -43,7 +43,7 @@ public Mono<ResponseView<FolderInfoView>> create(@RequestBody Folder folder) {
     @Override
     public Mono<ResponseView<Void>> delete(@PathVariable("id") String folderId) {
         return gidService.convertFolderIdToObjectId(folderId).flatMap(objectId ->
-            folderApiService.delete(objectId)
+            folderApiService.delete(objectId.orElse(null))
                 .delayUntil(f -> businessEventPublisher.publishFolderCommonEvent(f.getId(), f.getName(), EventType.FOLDER_DELETE))
                 .then(Mono.fromSupplier(() -> ResponseView.success(null))));
     }
@@ -73,8 +73,9 @@ public Mono<PageResponseView<?>> getElements(@RequestParam(value = "id", require
                                                  @RequestParam(required = false) String category,
                                                  @RequestParam(required = false, defaultValue = "1") Integer pageNum,
                                                  @RequestParam(required = false, defaultValue = "0") Integer pageSize) {
-        return gidService.convertFolderIdToObjectId(folderId).flatMap(objectId -> {
-            var flux = folderApiService.getElements(objectId, applicationType, name, category).cache();
+        return gidService.convertFolderIdToObjectId(folderId).flatMap(optionalObjectId -> {
+            String objectId = optionalObjectId.orElse(null);
+            var flux = folderApiService.getElements(optionalObjectId.orElse(null), applicationType, name, category).cache();
             var countMono = flux.count();
             var flux1 = flux.skip((long) (pageNum - 1) * pageSize);
             if (pageSize > 0) flux1 = flux1.take(pageSize);
@@ -89,8 +90,8 @@ public Mono<PageResponseView<?>> getElements(@RequestParam(value = "id", require
     public Mono<ResponseView<Void>> move(@PathVariable("id") String applicationLikeId,
             @RequestParam(value = "targetFolderId", required = false) String targetFolderId) {
         return gidService.convertFolderIdToObjectId(targetFolderId).flatMap(objectId ->
-            folderApiService.move(applicationLikeId, objectId)
-                .then(businessEventPublisher.publishApplicationCommonEvent(applicationLikeId, objectId, APPLICATION_MOVE))
+            folderApiService.move(applicationLikeId, objectId.orElse(null))
+                .then(businessEventPublisher.publishApplicationCommonEvent(applicationLikeId, objectId.orElse(null), APPLICATION_MOVE))
                 .then(Mono.fromSupplier(() -> ResponseView.success(null))));
     }
 
@@ -104,7 +105,7 @@ public Mono<ResponseView<Void>> updatePermission(@PathVariable String folderId,
         }
 
         return gidService.convertFolderIdToObjectId(folderId).flatMap(objectId ->
-            folderApiService.updatePermission(objectId, permissionId, role)
+            folderApiService.updatePermission(objectId.orElse(null), permissionId, role)
                 .then(Mono.fromSupplier(() -> ResponseView.success(null))));
     }
 
@@ -113,7 +114,7 @@ public Mono<ResponseView<Void>> removePermission(
             @PathVariable String folderId,
             @PathVariable String permissionId) {
         return gidService.convertFolderIdToObjectId(folderId).flatMap(objectId ->
-            folderApiService.removePermission(objectId, permissionId)
+            folderApiService.removePermission(objectId.orElse(null), permissionId)
                 .then(Mono.fromSupplier(() -> ResponseView.success(null))));
     }
 
@@ -126,14 +127,14 @@ public Mono<ResponseView<Void>> grantPermission(
             return ofError(INVALID_PARAMETER, "INVALID_PARAMETER", request.role());
         }
         return gidService.convertFolderIdToObjectId(folderId).flatMap(objectId ->
-            folderApiService.grantPermission(objectId, request.userIds(), request.groupIds(), role)
+            folderApiService.grantPermission(objectId.orElse(null), request.userIds(), request.groupIds(), role)
                 .then(Mono.fromSupplier(() -> ResponseView.success(null))));
     }
 
     @Override
     public Mono<ResponseView<ApplicationPermissionView>> getApplicationPermissions(@PathVariable String folderId) {
         return gidService.convertFolderIdToObjectId(folderId).flatMap(objectId ->
-            folderApiService.getPermissions(objectId)
+            folderApiService.getPermissions(objectId.orElse(null))
                 .map(ResponseView::success));
     }
 }

server/api-service/lowcoder-server/src/main/java/org/lowcoder/api/util/GidService.java

@@ -20,6 +20,8 @@
 import org.springframework.stereotype.Component;
 import reactor.core.publisher.Mono;
 
+import java.util.Optional;
+
 @Component
 public class GidService {
     @Autowired
@@ -72,11 +74,11 @@ public Mono<String> convertLibraryQueryIdToObjectId(String id) {
         return Mono.just(id);
     }
 
-    public Mono<String> convertFolderIdToObjectId(String id) {
+    public Mono<Optional<String>> convertFolderIdToObjectId(String id) {
         if(FieldName.isGID(id)) {
-            return folderRepository.findByGid(id).next().mapNotNull(HasIdAndAuditing::getId);
+            return folderRepository.findByGid(id).next().mapNotNull(HasIdAndAuditing::getId).map(Optional::ofNullable).switchIfEmpty(Mono.just(Optional.empty()));
         }
-        return Mono.just(id);
+        return Mono.just(Optional.ofNullable(id));
     }
 
     public Mono<String> convertBundleIdToObjectId(String id) {