[Solved]-Django Admin, sort with custom function

By following:

• The accepted answer to this post:
  Django admin: how to sort by one of the custom list_display fields that has no database field
• The
  How to execute arithmetic operations between Model fields in django
  (Disclaimer: I have composed that Q&A style example)

We can compose a solution to your problem:

from django.db.models import F

class ShotsAdmin(admin.ModelAdmin):
    list_display = ('get_ratio',)

    def get_queryset(self, request):
        qs = super(ShotsAdmin, self).get_queryset(request)
        qs = qs.annotate(ratio=F('hits') * 100 / F('all'))
        return qs

    def get_ratio(self, obj):
        return obj.ratio

    get_ratio.admin_order_field = 'ratio'

Explanation:

• The get_queryset method will annotate a new field named ratio to
  your queryset. That field’s value is the application of your ratio function on the hits and all fields.
• The get_ratio function returns the aforementioned field from a queryset instance.
• Finally: get_ratio.admin_order_field = 'ratio' sets the ratio field as the ordering field for your queryset on the admin panel.