Fix: reset documents sort field if user deletes the custom field (#9127)

src-ui/src/app/services/document-list-view.service.spec.ts

@@ -195,11 +195,7 @@ describe('DocumentListViewService', () => {
       { custom_field_999: ['Custom field not found'] },
       { status: 400, statusText: 'Unexpected error' }
     )
-    expect(documentListViewService.error).toEqual(
-      'custom_field_999: Custom field not found'
-    )
-    // reset the list
-    documentListViewService.sortField = 'created'
+    // resets itself
     req = httpTestingController.expectOne(
       `${environment.apiBaseUrl}documents/?page=1&page_size=50&ordering=-created&truncate_content=true`
     )

src-ui/src/app/services/document-list-view.service.ts

@@ -306,6 +306,14 @@ export class DocumentListViewService {
             // this happens when applying a filter: the current page might not be available anymore due to the reduced result set.
             activeListViewState.currentPage = 1
             this.reload()
+          } else if (
+            activeListViewState.sortField.indexOf('custom_field') === 0 &&
+            this.settings.allDisplayFields.find(
+              (f) => f.id === activeListViewState.sortField
+            ) === undefined
+          ) {
+            // e.g. field was deleted
+            this.sortField = 'created'
           } else {
             this.selectionData = null
             let errorMessage

src-ui/src/app/services/rest/document.service.ts

@@ -62,6 +62,10 @@ export class DocumentService extends AbstractPaperlessService<Document> {
     private customFieldService: CustomFieldsService
   ) {
     super(http, 'documents')
+    this.reload()
+  }
+
+  public reload() {
     if (
       this.permissionsService.currentUserCan(
         PermissionAction.View,