Checking if something exists in items of list variable in Django template

Question

I have a list of sections that I pass to a Django template. The sections have different types. I want to say "if there is a section of this type, display this line" in my template, but having an issue. What I'm basically trying to do is this.

{% if s.name == "Social" for s in sections %}
    Hello Social!
{% endif %}

But of course that's not working. Any idea how to basically in one line loop through the items in a list and do an if statement?

ADDITIONAL INFO: I could potentially have multiple "Social" sections. What I'm trying to do in the template is say "if there are any social sections, display this div. If not, don't display the div." But I dont want the div to repeat, which is what would happen with the above code.

Aaron Dufour · Accepted Answer · 2011-08-14 00:44:37Z

18

Ideally what you would do is create a list that the template gets as such:

l = [s.name for s in sections]

And in the template, use:

{% if 'Social' in l %}

You're trying to put more logic into a template than they are meant to have. Templates should use as little logic as possible, while the logic should be in the code that fills the template.

answered Aug 14, 2011 at 0:44

Aaron Dufour

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Shubham Namdeo · Accepted Answer · 2018-10-12 01:36:58Z

15

You can't use list comprehensions in templates:

{% for s in sections %}
  {% if s.name == 'Social' %}
    Hello Social!
  {% endif %} {# closing if body #}
{% endfor %} {# closing for body #}

edited Oct 12, 2018 at 1:36

Shubham Namdeo

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answered Aug 14, 2011 at 0:36

Gabriel Ross

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2 Comments

cdhowie Over a year ago

Should be s.name == 'Social'.

Brenden Over a year ago

Maybe I should have included different info. I could potentially have multiple "Social" sections. What I'm trying to do in the template is say "if there are any social sections, display this div. If not, don't display the div." But I dont want the div to repeat, which is what would happen with the above code. Thoughts?

mossplix · Accepted Answer · 2011-08-14 00:46:35Z

-1

{% if sections.0.name == "Social" %}
    Hello Social!
{% endif %}

answered Aug 14, 2011 at 0:46

mossplix

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