How to display the names of a material with a specific type and the associated subtype name?

Question

Drupal

Hi All!

Drupal 8.

Neither Drupal, nor Twig, nor PHP's object model is strong. :(

There are materials with the machine name direction. There are materials with the machine name direction_part associated with the direction.

The structure is approximately the following: Physics
-
Quantum
- Classical
- Relativistic
Chemistry
- Organic
- Inorganic
Biology
- Plants
- Animals

view

This doesn't work.

{% for item in direction %}
    {{ item.title }}
       {% for subitem in item.direction_part %}
            {{ subitem.title }}
       {% endfor %}
    {% endfor %}

Help!

Answer 1

{% set posts = node.direction %}
{% for item in posts %}
    {% set title = item.title.value %}
    {% set parts = item.direction_part %}
    {{ title }}
    {% for subitem in parts %}
        {% set subtitle = subitem.entity.title.value %}
        {{ subtitle }}
    {% endfor %}
{% endfor %}