[HtmlErrorRenderer] Allow rendering FlattenException object #60224

bpzr01 · 2025-04-15T06:55:56Z

bpzr01
Apr 15, 2025

Description

I could not find a way to render Symfony\Component\ErrorHandler\Exception\FlattenException. And it does not seem to be currently possible without custom code around it as the Symfony\Component\ErrorHandler\ErrorRenderer\HtmlErrorRenderer accepts \Throwable.

My use case is to store a serialized exception and render it later.

Example

No response

yceruto · 2025-04-15T18:40:44Z

yceruto
Apr 15, 2025
Collaborator

This is a special wrapper that already represents a serialized/rendered exception, so depending on where it came from, you can just use FlattenException::getAsString() or call HtmlErrorRenderer::getBody(), which accepts a FlattenException.

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bpzr01 · 2025-04-15T20:25:21Z

bpzr01
Apr 15, 2025
Author

I've managed to make it partly work like this. However I noticed that the script tags responsible for determining user preferred theme are missing. Also the show/hide trace buttons are not working.
Other than that, I’ve pretty much got what I needed—thanks!

$body = $this->htmlErrorRenderer->getBody($flattenException);
$stylesheet = $this->htmlErrorRenderer->getStylesheet();

return new Response("
    <!DOCTYPE html>
    <html lang=\"en\">
    <head>
    <meta charset=\"UTF-8\" />
    <meta name=\"robots\" content=\"noindex,nofollow\" />
    <meta name=\"viewport\" content=\"width=device-width,initial-scale=1\" />
    <title>View exception</title>

    <style>{$stylesheet}</style>
    </head>
    {$body}
    </html>
");

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[HtmlErrorRenderer] Allow rendering FlattenException object #60224

bpzr01 Apr 15, 2025

Description

Example

Replies: 2 comments

yceruto Apr 15, 2025 Collaborator

bpzr01 Apr 15, 2025 Author

bpzr01
Apr 15, 2025

yceruto
Apr 15, 2025
Collaborator

bpzr01
Apr 15, 2025
Author