List entries without specific tag

Question

I am trying to output a list of entries from a channel section that DO NOT have a certain tag.

I am able to output the entries that have the tag assigned by setting the tag as a variable and using relatedTo to filter the entries out. For example:

{% set tag = craft.tags.search('All-Stars').first() %}

{% if tag %}
{% set relatedEntries = craft.entries.section('news').relatedTo(tag) %}
{% endif %}

What is the best approach to output entries without the tag? I've tried the following:

{% set tag = craft.tags.search('All-Stars').first() %}
{% set allEntries = craft.entries.section('news') %}
{% set taggedEntries = craft.entries.section('news').relatedTo(tag) %}
{% set untaggedEntries = allEntries|without(taggedEntries) %}
{% for feedItems in untaggedEntries.limit(5).offset(1) %}

This however doesn't work and throws out some errors, the first being:

array to string conversion

craft/app/vendor/twig/twig/lib/Twig/Template.php(525)

$message = sprintf('Impossible to invoke a method ("%s") on a %s variable ("%s")', $item, gettype($object), $object);

I tried many other ideas like .relatedTo('not' ~ tag) and |without with no avail.

Is it something obvious I am missing or more advance than that?

Thanks in advance

Answer 1

You could try something like following reducing the tagged entries into IDs that you then filter against (see this thread):

{% set tag = craft.tags.search('All-Stars').first() %}
{% set allEntries = craft.entries.section('news') %}
{% set taggedEntries = craft.entries.section('news').relatedTo(tag).ids %}
{% set omitIds = 'and, not ' ~ taggedEntries|join(', not ') %}
{% set untaggedEntries = craft.entries.section('news').id(omitIds) %}