django、contenttype 和 m2m 通用关系

发布于 2024-12-27 23:20:47 字数 834 浏览 1 评论 0原文

我有以下型号：

应用
1. 联系表
2. 游戏
3. 着陆页
客户端

添加新客户端后，我想在客户端下添加新应用程序。为此，我在“客户端到应用程序”下添加了一个 m2m 字段，如下所示：

applications = models.ManyToManyField(Application, verbose_name=u'Applications')

由于应用程序可以是任何内容，因此我发现我需要使用内容类型框架。因此，我将以下内容放置在“应用程序模型”下：

applicationContentType = models.ForeignKey(ContentType)
applicationId = models.PositiveIntegerField()
application = generic.GenericForeignKey('applicationContentType', 'applicationId')

这样，我可以通过选择内容类型（本例中为内容表单）并键入现有联系表单的 ID 来添加新应用程序。我可以在管理页面上的客户 m2m 字段中看到它。

但是，当我执行以下操作时，我看不到刚刚添加到客户端的应用程序：

In [2]: t = Client.objects.get()
In [3]: t.applications.all()
Out[3]: []

并且必须记住新添加的联系表单的 ID 并不是很好。有一个优雅的解决方案吗？或者我应该改变对问题的看法并以不同的方式来做？

原文

I have the following models:

Application
1. Contact Form
2. Game
3. Landing Page
Client

After I add a new Client, I want to add new applications under client. For this, I added a m2m field under Clients to Applications like this:

applications = models.ManyToManyField(Application, verbose_name=u'Applications')

Since an application can be anything, I found out that I needed to use contenttype framework. So I placed the following under Application model:

applicationContentType = models.ForeignKey(ContentType)
applicationId = models.PositiveIntegerField()
application = generic.GenericForeignKey('applicationContentType', 'applicationId')

This way I can add new applications by selecting content type (content form in this case) and typing existing Contact Form's id. And I can see it in Client's m2m field on admin page.

However when I do the following, I can't see the application I just added to the Client:

In [2]: t = Client.objects.get()
In [3]: t.applications.all()
Out[3]: []

And having to remember the newly added Contact Form's id is not very nice. Is there an elegant solution of this? Or should I change my point of view to the problem and do it in a different way?

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从此见与不见 2025-01-03 23:20:47

注意：我知道这是一个非常古老的问题，但认为有人可能会受益

如果每个应用程序模型（或其 abstract 父级）将有一个 m2m 密钥客户。我不建议使用通用外键，除非它绝对不可避免（相信我，你稍后会感谢我）。

例如，采用应用程序模型：

class Application(models.Model):
    class Meta:
        abstract = True

    field1 = ...
    field2 = ...

    client = models.ManyToManyField('clients.Client',
                                    related_name="related_%(class)s")

使用此方法，您将分别通过 lated_games、lated_contactforms 和 lated_landingpages 向客户端提供反向字段。

Note: I know this is a very old question, but thought someone might benifit this

What you are describing would work perfectly if the each of the application models (or their abstract parent) would have a m2m key to the client. I would not recommend using generic foreign keys unless it's absolutely inevitable (trust me, you'll thank me later).

For instance, take an application model:

class Application(models.Model):
    class Meta:
        abstract = True

    field1 = ...
    field2 = ...

    client = models.ManyToManyField('clients.Client',
                                    related_name="related_%(class)s")

Using this approach you will have the reverse fields available to the client via the related_games, related_contactforms and related_landingpages respectively.

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