[FIXED] How use pagination and .filter in django

Issue

How use pagination and filtering together? I have problem because they dont want to work eachother, without filter pagination work but with filter my app have crashes. I know they are some examples how do this on stack overrflow, and it seems thaat problem is in html file but this examples arent fully understandable for me, i would be appreciate if someone would show me what i must change in my code then i would understand this better. I am currently learning Django and still i have problems with understanding someones else code, i understand very well what ive done in my code but when i see someone else code that looks diffrent than mine then i dont know whats going on.

views.py

def Product_list(request, category_slug=None):
 category=None
 categories=Category.objects.all()
 products=Product.objects.all()
 paginator=Paginator(products, 6)
 page=request.GET.get('page')
 products=paginator.get_page(page)

if category_slug:
    category=get_object_or_404(Category, slug=category_slug)
    products=products.filter(category=category)

return render(request, 'shop/product/Product_list.html',
                  {'products':products, 'category':category,
                   'categories':categories,})

product_list.html

<div class='paginator'>
 {% if products.has_previous %}
  <a href='?page1'><<</a>
  <a href='?page={{products.previous_page_number}}'><</a>
 {%endif%}
 {%for num in products.paginator.page_range%}
  {% if products.number == num %}
   <strong>{{num}}</strong>
  {%elif num > products.number|add:'-3' and num < products.number|add:'3' %}
   {{num}}
  {%endif%}
 {%endfor%}
 {% if products.has_next %}
  <a href='?page={{products.paginator.num_pages}}'>>></a>
  <a href='?page={{products.next_page_number}}'>></a>
 {%endif%}
</div>

Solution

You can only filter a QuerySet. But in your view, you're first paginating (so products is now a Page) and then trying filter that Page object. You should only paginate after you've got your final QuerySet with all filters applied.

Answered By - dirkgroten