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Asked: 2026-05-30T12:07:03+00:00

OK, this is rather awkward problem. I’m using collection form type in Symfony and

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OK, this is rather awkward problem. I’m using collection form type in Symfony and after I configure it with 

'prototype' => true,
'allow_add' => true

I would expect it to print prototype when I call either one of these in Twig template:

form_rest(form)
form_widget(form.subform.get('prototype'))

The problem is that Symfony prints that prototype only if collection contains at least one element.

Is this a bug I’m not aware of or I’m missing something?

Any idea would be greatly appreciated!
Thanks!

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1 Answer

  1. Editorial Team

    I have updated Symfony to it’s latest stable and prototype is still acting strange:

    • If no items exist it would render <div data-prototype="...."></div>
    • Otherwise it would render prototype as pure HTML (not as DIV‘s attribute above)

    Since no out-of-box solution exists, I was forced to do IF–ELSE in my JS. That is, JS first checks for data-prototype element and falls back to other one if it does not exists.

    As soon as I have some time to spare I will study this behavior and, if it’s turn out to be undesired (as I suspect it is), will report it as a bug…

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