Passing a variable into the parent template

[jedenastka]

I cannot pass a variable from a child template to it's parent.

I have this in child:

{% extends "parent" %}
{% set foo = "bar" %}

{% block content %}{% endblock content %}

And I'm trying to use the foo variable from parent:

[...]
{{ foo }}

{% block content %}{% endblock content %}
[...]

When I try to render child, I get an error saying foo isn't in scope:

Variable `foo` not found in context while rendering 'child'

Jinja appearently can do this: https://jinja.palletsprojects.com/en/3.0.x/tricks/#highlighting-active-menu-items

Note: I'm using Tera with Rocket.

[Keats]

In Tera, template outside of blocks is completely ignored in children. The way to do it here is to define a block in your parent template and override it in the children. Eg

{% block extra_data %}
// In tera unknown values are an error so it should be set to something if it's possible that it never gets set in a children.
{% set foo = "" %}
{% endblock %}

... and in the children
{% block extra_data %}
{% set foo = "bar" %}
{% endblock %}

should work and you should be able to use {{foo}} after the extra_data block