django admin：排除不在change_form中工作

Question

我有以下管理类：

from django.contrib import admin

class CommandAdmin (admin.ModelAdmin):
    list_display = ('name','status','get_requester', 'justification')
    readonly_fields = ('name','status','get_requester', 'request', 'justification')
    exclude = ('request',)

    def get_requester(self,obj):
        return obj.request.requester

    get_requester.command_order_field  = 'requester'  #Allows column order sorting
    get_requester.short_description = 'Who Requested'  #Renames column head


    def get_form(self, request, obj=None, **kwargs):
        self.exclude = ['request']
        form = super(CommandAdmin, self).get_form(request, obj, **kwargs)
        return form

    def get_queryset(self, request):
        print request
        qs = super(CommandAdmin, self).get_queryset(request).select_related('request')
        return qs.filter(status='pending', request__isnull=False)

Command模型看起来像这样......

class Command(models.Model):
    ... bunch of fields ...
    justification = models.CharField(max_length=2000, blank=True, null=True)
    request = models.ForeignKey('sudorequests.Request', blank=True, null=True)

当我到达更改表单时，“请求”对象仍然出现在表单上。这是一个屏幕截图：