Filter / Organize array into key, value pairs for twig

php
1{% set locations = {} %}
2
3{% for location in locationList.locations.all() %}
4  {# create a dynamic property if one doesn't exist #}
5  {% if not attribute(locations, location.locationState) is defined %}
6      {% set locations = locations|merge({ (location.locationState) : [location] }) %}
7
8  {# else update the dynamic property with the new title #}
9  {% else %}
10      {% set arr = attribute(locations, location.locationState) %}
11      {% set arr = arr|merge([location]) %}
12      {% set locations = locations|merge({ (location.locationState) : arr }) %}
13
14  {% endif %}
15{% endfor %}
16
17{{ dump(locations) }}
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