Template warnings #2230

daleif · 2025-02-17T11:35:20Z

daleif
Feb 17, 2025

I was just wondering whether it is known that one should not enable warnings in a Mojolicious template?

#!/usr/bin/env perl
use Mojolicious::Lite -signatures;

get '/' => sub ($c) {
    $c->stash( foo => 'bar' );
    $c->render(template => 'index');
};

app->start;
__DATA__

@@ index.html.ep
% use warnings;
% layout 'default';
% title 'Welcome';
<h1>Welcome to the Mojolicious real-time web framework!</h1>
<%= $foo %>    

@@ layouts/default.html.ep
<!DOCTYPE html>
<html>
  <head><title><%= title %></title></head>
  <body><%= content %></body>
</html>

Then

perl bug get /

gives

[2025-02-17 12:32:17.32860] [1456943] [trace] [DbJIcP1MmWrV] GET "/"
[2025-02-17 12:32:17.32878] [1456943] [trace] [DbJIcP1MmWrV] Routing to a callback
[2025-02-17 12:32:17.32904] [1456943] [trace] [DbJIcP1MmWrV] Rendering template "index.html.ep" from DATA section
Warning: Use of "scalar" without parentheses is ambiguous at template index.html.ep from DATA section line 5.
[2025-02-17 12:32:17.32950] [1456943] [trace] [DbJIcP1MmWrV] Rendering template "layouts/default.html.ep" from DATA section
[2025-02-17 12:32:17.32986] [1456943] [trace] [DbJIcP1MmWrV] 200 OK (0.001255s, 796.813/s)
<!DOCTYPE html>
<html>
  <head><title>Welcome</title></head>
  <body><h1>Welcome to the Mojolicious real-time web framework!</h1>
bar    
</body>
</html>

Note the warning.

In my use case I was using use Mojo::Base -signatures; in a template because I wanted to use signatures for the callback to a Collection->each, here -signatures implies warnings.

Not quite sure what it is mad about.

kraih · 2025-02-17T13:41:18Z

kraih
Feb 17, 2025
Maintainer

Yes, it is known. Something we've been trying to fix for a very long time without much luck.

0 replies

daleif · 2025-02-17T14:56:05Z

daleif
Feb 17, 2025
Author

Could it be listed in the docs somewhere? Lars Madsen Programmør Institut for Matematik Aarhus Universitet ***@***.******@***.***>

…

________________________________ From: Sebastian Riedel ***@***.***> Sent: 17 February 2025 14:41 To: mojolicious/mojo ***@***.***> Cc: Lars Madsen ***@***.***>; Author ***@***.***> Subject: Re: [mojolicious/mojo] Template warnings (Discussion #2230) Yes, it is known. Something we've been trying to fix for a very long time without much luck. — Reply to this email directly, view it on GitHub<#2230 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AKKC6CJTGPK7YM7U7PTMRO32QHRJLAVCNFSM6AAAAABXJD373KVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTEMRSGQ4TQNY>. You are receiving this because you authored the thread.Message ID: ***@***.***>

0 replies

guest20 · 2025-02-18T10:42:30Z

guest20
Feb 18, 2025

@daleif Seems unlikely, but does putting the variables in parens stop the warning?

@kraih Maybe Mojo::Template could use '' . instead of scalar in the code it generates? Obviously there's already been a conversation about this I haven't seen... is there a good place to look for that?

4 replies

daleif Feb 19, 2025
Author

For now I've just added

% no warnings 'ambiguous';

to the relevant templates. Having to write <%= ($var) %> all the time would just be annoying.

guest20 Feb 19, 2025

I wasn't asking if it was a good solution, I just wanted to know if it was a solution at all. ;)

daleif Feb 20, 2025
Author

I wasn't asking if it was a good solution, I just wanted to know if it was a solution at all. ;)

With the example I posted changed with this <%= ($foo) %>, no the warning remains.

guest20 Feb 20, 2025

So it's not any kind of solution then. Understood.

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