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⚡ Bolt: optimize data fetching in project detail page #25

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⚡ Bolt: optimize data fetching in project detail page #25

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⚡ Bolt: optimize data fetching in project detail page
google-labs-jules[bot] Apr 27, 2026
646ba32
Merge branch 'main' into bolt/concurrent-fetch-project-details-892706…
aicoder2009 May 1, 2026
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3 changes: 3 additions & 0 deletions .jules/bolt.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
## 2025-02-28 - [Concurrent Data Fetching]
**Learning:** Sequential data fetching can significantly increase page load latency. Combining independent fetch requests using `Promise.all` allows them to process concurrently, preventing network waterfalls.
**Action:** When implementing page components that require multiple independent data streams, analyze if they can be fetched in parallel using `Promise.all` rather than using sequential `await fetch()` calls.
78 changes: 40 additions & 38 deletions src/app/projects/[id]/page.tsx
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Expand Up @@ -49,50 +49,52 @@ export default function ProjectDetailPage({ params }: { params: Promise<{ id: st
return;
}

if (isSignedIn && projectId) {
fetchProjectAndLists();
}
}, [isLoaded, isSignedIn, projectId, router]);

const fetchProjectAndLists = async () => {
try {
setIsLoading(true);

// Fetch project details
const projectResponse = await fetch(`/api/projects/${projectId}`);
const projectResult = await projectResponse.json();

if (!projectResult.success) {
setError(projectResult.error || "Project not found");
return;
}
const fetchProjectAndLists = async () => {
try {
setIsLoading(true);

// Fetch data concurrently to reduce page load latency
const [projectResponse, listsResponse, allListsResponse] = await Promise.all([
fetch(`/api/projects/${projectId}`),
fetch(`/api/projects/${projectId}/lists`),
fetch("/api/lists")
]);

// Parse JSON concurrently
const [projectResult, listsResult, allListsResult] = await Promise.all([
projectResponse.json(),
listsResponse.json(),
allListsResponse.json()
]);
Comment on lines +56 to +68
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Copilot AI Apr 27, 2026

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Using Promise.all for all three fetches makes the whole load fail if any request rejects or JSON parsing fails (e.g., /api/lists transient 500), which is a behavior regression vs the prior sequential flow where the project could still render and only lists would be missing. Consider fetching/parsing the project first (or using Promise.allSettled) and only treating the project request as fatal; handle lists/all-lists failures independently (e.g., keep project visible and show a non-blocking error banner).

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if (!projectResult.success) {
setError(projectResult.error || "Project not found");
return;
}

setProject(projectResult.data);
setEditName(projectResult.data.name);
setEditDescription(projectResult.data.description || "");
setProject(projectResult.data);
setEditName(projectResult.data.name);
setEditDescription(projectResult.data.description || "");

// Fetch lists in project
const listsResponse = await fetch(`/api/projects/${projectId}/lists`);
const listsResult = await listsResponse.json();
if (listsResult.success) {
setLists(listsResult.data);
}

if (listsResult.success) {
setLists(listsResult.data);
if (allListsResult.success) {
setAllLists(allListsResult.data);
}
} catch (err) {
console.error("Error fetching project:", err);
setError("Failed to load project");
} finally {
setIsLoading(false);
}
};

// Fetch all user lists (for adding to project)
const allListsResponse = await fetch("/api/lists");
const allListsResult = await allListsResponse.json();

if (allListsResult.success) {
setAllLists(allListsResult.data);
}
} catch (err) {
console.error("Error fetching project:", err);
setError("Failed to load project");
} finally {
setIsLoading(false);
if (isSignedIn && projectId) {
fetchProjectAndLists();
}
};
}, [isLoaded, isSignedIn, projectId, router]);

const handleUpdateProject = async () => {
if (!editName.trim()) {
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