Skip to content

fix: explain why json() cannot be used in form actions #12829

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
dummdidumm merged 7 commits into from
Oct 23, 2024
Merged

fix: explain why json() cannot be used in form actions #12829

Show file tree
Hide file tree
Changes from 3 commits
Commits
Show all changes
7 commits
Select commit Hold shift + click to select a range
91ebc2d
add better error message
Oct 18, 2024
bf60632
changeset
Oct 18, 2024
d279ff5
plain objects
Oct 18, 2024
f62eaeb
Update .changeset/healthy-planets-dance.md
teemingc Oct 18, 2024
8116883
Update packages/kit/src/runtime/server/page/actions.js
teemingc Oct 18, 2024
4be8f45
add comment for devalue error branch
Oct 18, 2024
b8e8cc7
more specifically
Oct 18, 2024
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
5 changes: 5 additions & 0 deletions .changeset/healthy-planets-dance.md
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
'@sveltejs/kit': patch
---

fix: explain why `json()` cannot be used in form actions
7 changes: 7 additions & 0 deletions packages/kit/src/runtime/server/page/actions.js
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -280,6 +280,13 @@ function try_deserialize(data, fn, route_id) {
// If we're here, the data could not be serialized with devalue
const error = /** @type {any} */ (e);

// if someone tries to use `json()` in their action
if (data instanceof Response) {
Copy link
Member

@benmccann benmccann Oct 18, 2024

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

there's nothing really specific in this error message about a Response, so I'm wondering why the if below doesn't catch it. It seems like we could combine the two. Maybe they need to check if it's an instance of DevalueError or if name is DevalueError?

Copy link
Member Author

@teemingc teemingc Oct 19, 2024 •
edited
Loading

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

It still catches it but the error message is usually "Cannot stringify arbitrary non-POJOs" which can be unhelpful. We could combine the two but I'm wondering if there are instances where devalue's error message is preferred.

throw new Error(
`Data returned from action inside ${route_id} is not serializable. Form actions need to return plain objects or fail(). e.g. return { success: true } or return fail(400, { message: "invalid" });`
);
}

if ('path' in error) {
let message = `Data returned from action inside ${route_id} is not serializable: ${error.message}`;
if (error.path !== '') message += ` (data.${error.path})`;
Expand Down