from django.contrib.admin.decorators import admin_action

# inside CommentManager in django.contrib.comments.models


    @admin_action( name='Delete selected posts' )
    def multi_delete( self, id_list ):
        res = ""
        for id in id_list:
            obj = self.get( pk=id )
            res += repr( obj )
            obj.delete()
            res += "<br/>\n"
        return "Deleted %s" % res