django admin inlines:从formfield_for_foreignkey获取对象

我试图在django管理内联中过滤外键字段中显示的选项.因此,我想访问正在编辑的父对象.我一直在研究,但找不到任何解决方案.

class ProjectGroupMembershipInline(admin.StackedInline):
    model = ProjectGroupMembership
    extra = 1
    formset = ProjectGroupMembershipInlineFormSet
    form = ProjectGroupMembershipInlineForm

    def formfield_for_foreignkey(self, db_field, request=None, **kwargs):
        if db_field.name == 'group':
            kwargs['queryset'] = Group.objects.filter(some_filtering_here=object_being_edited)
        return super(ProjectGroupMembershipInline, self).formfield_for_foreignkey(db_field, request, **kwargs)

我已经验证了编辑对象时kwargs是空的,所以我无法从那里获取对象.

有什么帮助吗？谢谢