Ternary not working in blade field curly braces

Hi, in a reusable form, I try to handle 3 conditions for a field: old value, edit value, and empty:

<input type="text" value="{{old('subject', $topic ? $topic->subject : ' '  )}}"/>

I was thinking this would work, but it gives a "Undefined variable $topic" error.

How to handle this situation?

Best Answer

Level 102

Check if the $topic variable exists (Not sure why the variable itself would not be set though)

<input type="text" value="{{old('subject', isset($topic) ? $topic->subject : ' '  )}}"/>

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Level 6

Thanks, I had tried with directive @isset / @endisset and that didn't work but your solution does thanks.

Level 35

This should also work:

{{ old('subject', $topic->subject ?? ' ') }}

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Level 6

@click Thanks it works but not the ?-> version.

Level 102

@brakkar the ?-> version only works if $topic is set at all (if it's set to null)

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