Here we go:

{% set state = craft.categories.group('locations').level(1).title(entry.title).one() %}
{% set solution = craft.categories.group('institutionSolutions').title(entry.parent.title).one() %}
{% set entries = craft.entries.section('institutions').relatedTo('and', state, solution).limit(4) %}

   {% for entry in entries %}
       {{ entry.title }}
   {% endfor %}

The following code does work as expected in Craft 2. According to the docs in Craft 3 we have to use the array brackets. So this

{% set entries = craft.entries.section('institutions').relatedTo('and', state, solution).limit(4) %}

will become to this

{% set entries = craft.entries.section('institutions').relatedTo(['and', state, solution).limit(4) %}

as a result I see the following message:

array_merge(): Argument #2 is not an array

What am I doing wrong? :(

  • You're missing a closing square bracket fyi... Apr 4 '18 at 17:45

When you are going to apply an and in your relatedTo in Craft 3 it expects the following arguments to be arrays with the structure like here

{% set entries = craft
        {element: state}, // <- or targetElement / sourceElement
        {element: solution}
  • You saved me with the {element: variable} syntax. Where did you learn that from? I can't find syntax like that anywhere in the docs.
    – Brimby
    Jun 22 '20 at 7:57
  • @Brimby it's in the documentation I linked in my post Jun 23 '20 at 13:01

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