在Twig中将字符串连接为变量

Question

I have a form that generates field per category, so if I have 5 categories, twig will generate 5 category field.

This array consist of 5 categories, so it will loop 5 times.

{% set categories = ['attraction', 'featured_artist', 'co_presentator', 'major_sponsor', 'minor_sponsor'] %}

I'll count the total category and deduct it by 1 for the use of for loop. We're using in array so it would be like 0,1,2,3.. etc.

{% set total_category = categories|count -1 %}

Now the looping starts here, I have a different column in database, called attraction_image, major_sponsor_image, featured_artist_image. So I have to count the total value in that field per category.

{% for i in 0..total_category %}

    <div class="increment-field-container" data-increment-host="{{ categories[i] }}">
        {% set total_field = details.attraction_image|explode|count %}

    </div>
{% endfor %}

How can I concatenate string as variable,

We're calling the total of field like this

{% set total_field = details.attraction_image|explode|count %}

But I want to happen is,

{% set total_field = details.categories[i]_image|explode|count %}

Technically it would be incorrect:

I tried this String Interpolation thing, but still did not work.

{% set total_field = details."#{categories[i]}"_image|explode|count %}

Any solution to this problem?

Answer 1

You can use the attribute function for this. See my similar answer for details.