django admin default filter values

admin.py

class YourAdmin(ModelAdmin):
    def changelist_view(self, request, extra_context=None):
        ref = request.META.get('HTTP_REFERER','')
        path = request.META.get('PATH_INFO','')
        if not ref.split(path)[-1].startswith('?'):
            q = request.GET.copy()
            q['usertype'] = 'Publisher'
            q['user_status__exact'] = 'activated'
            request.GET = q
            request.META['QUERY_STRING'] = request.GET.urlencode()
        return super(BulkMigrationAdmin,self).changelist_view(request, extra_context=extra_context)

This doesn't work. request.META.get('HTTP_REFERER', '') is page view behind. So the first time you try to change the filter value, you get the defaults again.

this maybe works better.
when following admin navigation, the filter will become effective.
when open the url directly, the filter will not work.

def changelist_view(self, request, extra_context=None):
ref = request.META.get('HTTP_REFERER', '').split('?')[0]
if ref and not ref.endswith(request.path):
...