django admin 自动选择登录用户

Django 为我们提供了一个很好的管理界面。但是当我们只使用默认值时，用户需要自己选择他们是谁。我们想为他们自动选择，他们不能假装是其他人。

class NotesAdmin(admin.ModelAdmin):
    def formfield_for_foreignkey(self, db_field, request, **kwargs):
        if db_field.name == 'created_by':
            kwargs['queryset'] = User.objects.filter(username=request.user.username)
        return super(NotesAdmin, self).formfield_for_foreignkey(db_field, request, **kwargs)

    def get_readonly_fields(self, request, obj=None):
        if obj is not None:
            return self.readonly_fields + ('created_by',)
        return self.readonly_fields

    def add_view(self, request, form_url="", extra_context=None):
        data = request.GET.copy()
        data['created_by'] = request.user
        request.GET = data
        return super(NotesAdmin, self).add_view(request, form_url="", extra_context=extra_context)