Symfony2 Twig Get Total Count for Child Entity

Question

The following entities exist, Farm, Barn and Animals. A Farm can have many Barns and a Barn many Animals.

When displaying a Farm in a TWIG template the number of Animals

Answer 1

Use Entity accessors :

{% for farm in farms %}

  {{ farm.name }}

  {% set barns = farm.getBarns() %}

  Barns count = {{ barns|length }}

  {% for barn in barns %}

    {% set animals = barn.getAnimals() %}

    {{ barn.name }} animals count : {{ animals|length }}

  {% endfor %}

{% endfor %}

Answer 2

You are looking for the length filter

When used with an array, length will give you the number of items. So, if your array is farm.barns, you can just use {{ farm.barns|length }}