Flexible Django Filter (django-filter package)

I'm currently implementing some filters and I'm facing multiple problems. First of all my checkboxes don't work, as in I can't select them: current look of filter

this is my .html code:

<form method="get">
    <div class="toggle-list product-categories">
        <h6 class="title">Sorteer</h6>
        <div class="shop-submenu">
            <ul>
                {{ filter.form.order_by }}
            </ul>
        </div>
    </div>
    <div class="toggle-list product-categories">
        <h6 class="title">Merk(en)</h6>
        <div class="shop-submenu">
            <ul>
                {% for f in filter.form.brand %}
                    <li>
                        <input type="checkbox">
                        <label>{{ f }}</label>
                    </li>
                {% endfor %}
            </ul>
        </div>
    </div>
    <input type="submit" value="Filter">
</form>

my filter in filters.py:

class SortFilter(django_filters.FilterSet):
    ORDER_BY_CHOICES = (
        ('-discount_sort', 'Hoogste korting'),
        ('-new_price', 'Hoogste prijs'),
        ('new_price', 'Laagste prijs'),
    )
    order_by = django_filters.ChoiceFilter(label='Sorteer op', choices=ORDER_BY_CHOICES, method='filter_by_order',
                                           empty_label=None)
    brand = django_filters.ModelMultipleChoiceFilter(queryset=Product.objects
                                                     .order_by('brand')
                                                     .filter(categorie='eiwitten')
                                                     .values_list('brand', flat=True).distinct()
                                                     , widget=forms.CheckboxSelectMultiple, required=False)

    class Meta:
        model = Product
        fields = ['brand']

    def filter_by_order(self, queryset, name, value):
        return queryset.order_by(value)

view function for this certain page:

def eiwit(request):
    # filter alleen eiwitproducten
    eiwit_list = ['eiwitten']
    eiwit_filter = Q()
    for item in eiwit_list:
        eiwit_filter = eiwit_filter | Q(categorie=item)

    products = models.Product.objects.filter(eiwit_filter)
    product_amount = len(products)

    # sorteer filter
    filtered = SortFilter(
        request.GET,
        queryset=products
    )

    # paginator
    paginator = Paginator(filtered.qs, 12)
    page = request.GET.get('page')
    try:
        response = paginator.page(page)
    except PageNotAnInteger:
        response = paginator.page(1)
    except EmptyPage:
        response = paginator.page(paginator.num_pages)
    product_front_end = {
        'final_products': response,
        'filter': filtered,
        'count': product_amount,
    }
    return render(request, 'producten/eiwit.html', product_front_end)

Second of all, I would like the filter to be more generic. As in all categories have different amount of brands. As you can see I currently create options by selecting all the 'brand' values within the 'eiwitten' categorie (in filters.py). Is there a way to call the filter in views.py with a variable (like 'eiwittien'). Which then will be used to adjust the filter in filter.py according to the page it is on? This way I have a dynamic filter for all categories.

This might help with some of your issues. Your input tag is missing information on the name/id fields. You should be able to populate those by adding template tags to fill the values.

<input type="checkbox" id="BSN" name="BSN"> <label for="BSN">BSN</label>
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