django admin内联字段选项根据主表单字段值过滤

Question

我有以下型号：

class Organizations(models.Model):
    name = models.CharField(max_length=30,unique=True)

class Postcodes(models.Model):
    organization = models.ForeignKey(Organizations,on_delete=models.PROTECT)
    postcode = models.PositiveBigIntegerField()

class Agent(models.Model):
    organization = models.ForeignKey(Organizations,on_delete=models.PROTECT)
    name = models.CharField(max_length=50)

class AgentPostcodes(models.Model):
    agent= models.ForeignKey(Agent,on_delete=models.PROTECT)
    postcode = models.ForeignKey(Postcodes,on_delete=models.PROTECT)

而 admin.py 是

class AgentPostcodesInline(admin.TabularInline):
    model = AgentPostcodes

class AgentAdmin(admin.ModelAdmin):
    list_display = ['organization','name']
    inlines = [AgentPostcodesInline]    

我如何才能根据组织过滤内联表单字段，以获取仅与该组织相关的邮政编码。 目前它显示所有组织的邮政编码，甚至与代理无关。

Answer 1

覆盖TabularInline(InlineModelAdmin)get_queryset方法类似于documentation中描述的方法：

ModelAdmin.get_queryset(request)

ModelAdmin 上的 get_queryset 方法返回一个包含所有 可以由管理站点编辑的模型实例。一个用例 覆盖此方法是显示登录用户拥有的对象：

class MyModelAdmin(admin.ModelAdmin):
    def get_queryset(self, request):
        qs = super().get_queryset(request)
        if request.user.is_superuser:
            return qs
        return qs.filter(author=request.user)