🐛(frontend) fix duplicate document entries in grid

The tests e2e were failing sometimes because
the documents list was containing duplicates.
This was happening when multiple users were
modifying the documents list (creation, update, ...).
We now deduplicate documents by their ID
before displaying them.

CHANGELOG.md

@@ -6,11 +6,15 @@ and this project adheres to
 
 ## [Unreleased]
 
+## Fixed
+
+- 🐛(frontend) fix duplicate document entries in grid #1479
+
 ## [3.8.2] - 2025-10-17
 
 ### Fixed
 
-🐛(service-worker) fix sw registration and page reload logic #1500
+- 🐛(service-worker) fix sw registration and page reload logic #1500
 
 ## [3.8.1] - 2025-10-17
 

src/frontend/apps/impress/src/features/docs/docs-grid/components/DocsGrid.tsx

@@ -1,4 +1,5 @@
 import { Button } from '@openfun/cunningham-react';
+import { useMemo } from 'react';
 import { useTranslation } from 'react-i18next';
 import { InView } from 'react-intersection-observer';
 import { css } from 'styled-components';
@@ -36,7 +37,19 @@ export const DocsGrid = ({
     hasNextPage,
   } = useDocsQuery(target);
 
-  const docs = data?.pages.flatMap((page) => page.results) ?? [];
+  const docs = useMemo(() => {
+    const allDocs = data?.pages.flatMap((page) => page.results) ?? [];
+    // Deduplicate documents by ID to prevent the same doc appearing multiple times
+    // This can happen when a multiple users are impacting the docs list (creation, update, ...)
+    const seenIds = new Set<string>();
+    return allDocs.filter((doc) => {
+      if (seenIds.has(doc.id)) {
+        return false;
+      }
+      seenIds.add(doc.id);
+      return true;
+    });
+  }, [data?.pages]);
 
   const loading = isFetching || isLoading;
   const hasDocs = data?.pages.some((page) => page.results.length > 0);