object of type 'NoneType' has no len() in django ClassBased ListView

Question

I have the below view for displaying list of searched records ``` class ListOfSearchedRecords(LoginRequiredMixin, ListView): template_name = 'list_of_searched_records.html' context_object_name = 'filtered_records' paginate_by = 10 def get_queryset(self): """ Returns the Records """ if self.request.method == "GET" and self.request.GET: if 'q' in self.request.GET: if self.request.GET['q']: keyword = self.request.GET.get('q', None) log.debug("Filtered keyword: %s", keyword) result = Product.objects.order_by('-created').filter( Q(products__name__icontains=keyword)) if result: return result else: return [] def get_context_data(self, **kwargs): context = super(ListOfSearchedRecords, self).get_context_data(**kwargs) context.update( { 'context_list':['Data_one', 'Data_two', 'Data_three']} ) return context ``` Traceback ``` Traceback (most recent call last): File "/home/user/Envs/proj/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 115, in get_response response = callback…

Accepted Answer

The method `get_queryset` doesn't return anything when you haven't filled something in for `q` in `request.GET`. Hence it returns `None` which isn't a valid QuerySet or iterable. As such Django can't call `len()` on it.

You need to ensure `get_queryset` always returns a value:

```
def get_queryset(self):
    """
    Returns the Records 
    """
    if self.request.method == "GET" and self.request.GET:
        if 'q' in self.request.GET:
          if self.request.GET['q']:
            # ...
    return [] # add this line here
```

object of type 'NoneType' has no len() in django ClassBased ListView

Solution

Problem