title: Filter ranges using Django Backend filter?
body: <p>I am working on project using django rest framework in which i have to filter different parameters given by user.I am using django Filter backend.
   Here is my code:</p>
  
  <pre><code>class FilterViewSet(viewsets.ModelViewSet):
  
  serializer_class = SearchSerializer
  
  #Filters on specific fields
  filter_backends = (DjangoFilterBackend,)
  
  filter_fields = ('property_zipcode','property_state', 
                   'property_county',
                   'property_city','property_area',)#range between 100 to 500 or area less then 500.
  
  #range is pass by user as a property_area=300.
  
  def filter_queryset(self, queryset):
      if self.request.query_params.get('property_state', None):
          queryset = super(FilterViewSet, self).filter_queryset(self.get_queryset())
          return queryset
      else:
          queryset = self.get_queryset()
          return queryset
  </code></pre>
  
  <p>Everything is working fine. But now i have to filter property_area based on range like 100 sqft to 500 sqft. How i can achieve this using djangoFilter backend? </p>