fix: Allow to have null folder for flows

packages/backend/src/models/flow.js

@@ -351,17 +351,20 @@ class Flow extends Base {
   async updateFolder(folderId) {
     const user = await this.$relatedQuery('user');
 
+    if (folderId === null) {
+      return this.updateFolderReference(null);
+    }
+
     const folder = await user
       .$relatedQuery('folders')
-      .findOne({
-        id: folderId,
-      })
+      .findOne({ id: folderId })
       .throwIfNotFound();
 
-    await this.$query().patch({
-      folderId: folder.id,
-    });
+    return this.updateFolderReference(folder.id);
+  }
 
+  async updateFolderReference(folderId) {
+    await this.$query().patch({ folderId });
     return this.$query().withGraphFetched('folder');
   }
 

packages/backend/src/models/flow.test.js

@@ -505,6 +505,37 @@ describe('Flow model', () => {
       expect(updatedFlow.folder.id).toBe(folder.id);
       expect(updatedFlow.folder.name).toBe(folder.name);
     });
+
+    it('should return the flow with null folder when folderId is null', async () => {
+      const user = await createUser();
+      const flow = await createFlow({ userId: user.id });
+
+      const updatedFlow = await flow.updateFolder(null);
+
+      expect(updatedFlow.folder).toBe(null);
+    });
+  });
+
+  describe('updateFolderReference', () => {
+    it('should update the folder reference and return the flow with the updated folder', async () => {
+      const user = await createUser();
+      const flow = await createFlow({ userId: user.id });
+      const folder = await createFolder({ userId: user.id });
+
+      const updatedFlow = await flow.updateFolderReference(folder.id);
+
+      expect(updatedFlow.folder.id).toBe(folder.id);
+      expect(updatedFlow.folder.name).toBe(folder.name);
+    });
+
+    it('should update the folder reference to null and return the flow with null folder', async () => {
+      const user = await createUser();
+      const flow = await createFlow({ userId: user.id });
+
+      const updatedFlow = await flow.updateFolderReference(null);
+
+      expect(updatedFlow.folder).toBe(null);
+    });
   });
 
   describe('throwIfHavingIncompleteSteps', () => {