Updating object properties in twig

Question

Is there a way to update an object\'s property in twig?

An object like the following is passed to twig:

object
   property1
   property2

Answer 1

I had the same problem in my knp menu template. I wanted to render an alternate field with the label block, without duplicating it. Of course the underlying object needs an setter for the property.

{%- block nav_label -%}
    {%- set oldLabel = item.label %}
    {%- set navLabel = item.getExtra('nav_label')|default(oldLabel) %}
    {{- item.setLabel(navLabel) ? '' : '' }}
    {{- block('label') -}}
    {{- item.setLabel(oldLabel) ? '' : '' }}
{%- endblock -%}