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How to display N number of Backward relationship in Django templates?

{% for category in categories %}
    {% for product in categories.product_set.all %}
        <h1> {{ product.name }} </h1>
    {% endfor %}
{% endfor %}

I want to show 10 products instead of all in template

There is a slice filter that you can use in templates:

{% for category in categories|slice:":10" %}
    {% for product in categories.product_set.all %}
        <h1> {{ product.name }} </h1>
    {% endfor %}
{% endfor %}

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