How to pass template variable to slice filter in Django templates

Question

I'm trying to slice loop in django template with variable

USUAL WAY

{% for article in module.module_article_key.module_article_category.article_category_key.all|slice:":2" %}
    {{ article.article_title }}
{% endfor %}

WHAT NEEDS

{% for article in module.module_article_key.module_article_category.article_category_key.all|slice:":module.module_article_key.module_article_count" %}
    {{ article.article_title }}
{% endfor %}

so we have working variable {{ module.module_article_key.module_article_count }}

normaly this variable gives integer value stored for this module, however wen i use it to slice loop - nothing happens

Answer 1

You need to cast module_article_count to string first then making articleSlice via nested {% with %} and use the resulting template variable in slice filter as follow:

{% with  articleCount=module.module_article_key.module_article_count|stringformat:"s" %}
    {% with  articleSlice=":"|add:articleCount %}
        {% for article in module.module_article_key.module_article_category.article_category_key.all|slice:articleSlice %}
            {{ article.article_title }}
        {% endfor %}
    {% endwith %}
{% endwith %}