Concatenate String as Variable in Twig

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?

Community · Accepted Answer · 2017-05-23 12:31:53Z

3

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

edited May 23, 2017 at 12:31

CommunityBot

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answered Jul 28, 2015 at 3:41

Richard

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1 Comment

Brian Coolidge Over a year ago

While waiting for an answer I'm reading into that documentation, and quite confused on it and here we go, you clarified on how to use it in other question. Thanks a lot! :)

Tim Bogdanov · Accepted Answer · 2021-08-20 16:50:28Z

I actually came accross this after figuring it out. But the way I got around this issue was as Richard pointed out, using the attribute method:

{% set field_1 = input_get('field_1') %} {{attribute(blogs, field_1) }}

Whatever you have field_1 se as (for example 'layouts') it would equate to

blogs.layouts

Hope this helps!

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