Nested braces in twig (symfony)

Question

I am trying to set a data- attribute for a save button, but it doesn't like the nested braces. I'm getting an error on the "###THIS LINE" line.

 {% for file in payment.files %}
     <br>
     <li>
         ...
         ... etc...
         ... 
         {{ form_widget(file.save, {'attr':{'data-file-id': {{ file.id}} } }) }} ###THIS LINE

     </li>
{% endfor %}

The error I am getting is: A hash key must be a quoted string, a number, a name, or an expression enclosed in parentheses (unexpected token "punctuation" of value "{".

I guess it doesn't like the nested braces.

Any help is greatly appreciated.

Answer 1

尝试将file.id转换为字符串：

{{ form_widget(file.save, {'attr':{'data-file-id': file.id.__toString } }) }}

Answer 2

去尝试一下：

{{ form_widget(file.save, {'attr':{'data-file-id': file.id } }) }}

Answer 3

尝试：

{{ form_widget(file.save, {'attr': {'data-file-id': file.id|string } }) }}