Added view for editing GradingRecords. This view shows a list of GradingRecords if the id param is not present in the GET data. Also renamed grading_record to view_records and fixed the redirect for that page to also point to the GradingRecord edit page.

from django.contrib import admin
from django.contrib.sites.models import Site


class SiteAdmin(admin.ModelAdmin):
    list_display = ('domain', 'name')
    search_fields = ('domain', 'name')

admin.site.register(Site, SiteAdmin)