How to negate an {% if ... in ... %} statement

[vin-aws]

I am trying to filter blog posts in a listing template and have

{% if "my tag" in content.topic_list|pprint %}
// HTML Markup
{% endif %}

Which shows posts when they are tagged with "my tag". How do I negate this to show posts that do NOT contain "my tag". I've tried inserting "not" everywhere in the statement with no success.

{% not if "my tag" in content.topic_list|pprint %}
{% if not "my tag" in content.topic_list|pprint %}
{% if "my tag" not in content.topic_list|pprint %}
{% if "my tag" in not content.topic_list|pprint %}

{% if "my tag" is not in content.topic_list|pprint %}

All don't work.

Also side note... why do I have to pprint to be able to use the "in" operator... It doesn't work if I just call it on content.topic_list. Seems like a bug to me.

[MFrankJohnson · Accepted solution]

This code isn't pretty, but should work ... 

{% if "my tag" in content.topic_list|pprint %}
{% else %}
  // HTML Markup
{% endif %}

This also works.  ( tested by @vin-aws )

{% if not ("my tag" in content.topic_list)|pprint %}
  // HTML Markup
{% endif %}

Couldn't find any examples of the logical 'not' operator documented for use with the 'in' operator. Maybe some of the other guys know @tjoyce, @Stephanie-OG

Hope that helps a little.

[tjoyce]

@vin-aws, @MFrankJohnson is right, this is the way to do it with the {% else %} statement

[vin-aws]

Oh yeah slipped my mind I could just use an 'else'

[MFrankJohnson]

Yea ... but it ain't 'pretty'. haha And you know we like our code 'pretty'. lol 🙂

Will you please test out that 'not' alternative and let us know @vin-aws?

Logic doesn't always prevail when it comes to code syntax.

[vin-aws]

Yeah the parenthesis worked for some reason...