Django - 如何从模型实例中获取管理员 URL

问题描述

我正在尝试在保存新模型实例时向用户发送电子邮件，并且我希望电子邮件包含指向该模型实例管理页面的链接.有没有办法获得正确的网址?我认为 Django 必须将这些信息存储在某个地方.

I'm trying to send an email to a user when a new model instance is saved and I want the email to include a link to the admin page for that model instance. Is there a way to get the correct URL? I figure Django must have that information stored somewhere.

推荐答案

这个 Django 片段 应该做:

from django.urls import reverse
from django.contrib.contenttypes.models import ContentType
from django.db import models

class MyModel(models.Model):

    def get_admin_url(self):
        content_type = ContentType.objects.get_for_model(self.__class__)
        return reverse("admin:%s_%s_change" % (content_type.app_label, content_type.model), args=(self.id,))

self 引用父模型类，即self.id 引用对象的实例id.您也可以将其设置为 property通过将 @property 装饰器粘贴在方法签名之上来建模.

The self refers to the parent model class, i.e. self.id refers to the object's instance id. You can also set it as a property on the model by sticking the @property decorator on top of the method signature.

Chris Pratt 下面 的答案在 ContentType 表.我的回答仍然有效"，并且较少依赖于 Django 模型 instance._meta 内部.仅供参考.

The answer by Chris Pratt below saves a DB query over the ContentType table. My answer still "works", and is less dependent on the Django model instance._meta internals. FYI.

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