python - 禁止 Django 自引用外键指向自身对象

Question

我有一个常规的自引用外键:

idol = models.ForeignKey("self", on_delete=models.CASADE)

管理页面允许我选择相同的对象 ID。如何防止 django 管理表单显示它？

Answer 1

您可以覆盖 formfield_for_foreignkey在您的 ModelAdmin 类的子类中。

The formfield_for_foreignkey method on a ModelAdmin allows you to override the default formfield for a foreign keys field.

父对象id可以保存在change_view方法中:

class IdolAdmin(admin.ModelAdmin):
    def change_view(self, request, object_id, form_url='', extra_context=None):
        self.object_id = object_id
        return super(IdolAdmin, self).change_view(
            request, object_id, form_url, extra_context=extra_context,
        )

    def formfield_for_foreignkey(self, db_field, request, **kwargs):
        if db_field.name == "idol":
            kwargs['queryset'] = Idol.objects.exclude(pk=self.object_id)
        return super(IdolAdmin, self).formfield_for_foreignkey(
            db_field, request, **kwargs)