Question

I have an variable that I need to alter inside the template.

Let’s say the variable foo is 4, but I need the value to be foo + 1.

I’ll then use this in an if statement, like so:

{% if bar == foo+1 %}
<p>Condition has been met!</p>
{% endif %}

Answer 1

You can do

{% if bar == foo|add:1 %}
<p>Condition has been met!</p>
{% endif %}

Or another is:

{%with newfoo=foo|add:1 %}
  {% if bar == newfoo %}
  <p>Condition has been met!</p>
  {% endif %}
{%endwith%}