在Django中获取和显示相关对象 [英] Getting and displaying related objects in Django

问题描述

我知道这很简单，但是我无法理解如何将某些模型结合在一起以显示在Django的模板中。我有可以有多个联系人的组。

I know this is simple, but I can't get my head around how to join some models together to display in my template in Django. I have "groups" that can have several "contacts".

到目前为止，我已经了解了：

So far I've got:

class Group(models.Model):
    group_name = models.CharField()

class Contact(models.Model):
    contact_name = models.ForeignKey(Group)

在我看来，起初我以为只是让我的组也可以获取任何附加的联系人，但是似乎未按预期发生：

In my view, at first I assumed that simply getting my groups would also get any attached contacts, however that doesn't appear to be happening as expected:

def get_queryset(self):
    groups = Group.objects.all()
    return groups

我原本希望这样做在我的模板中是这样的：

I was expecting to do something like this in my template:

{% for group in groups %}
    <h2>{{ group.group_name }}</h2>
    {% for c in group.contact %}
        <h3>{{ c.contact_name }}</h3>
    {% endfor %}
{% endfor %}

这是'无法正常工作-我在做什么错？在我看来，确保要检索每个组的联系人的正确查询是什么？

This isn't working - what am I doing wrong? What is the correct query in my view to make sure the contact(s) for each group is getting retrieved?

推荐答案

看起来您已经从其他地方获取了一些代码，因此为了完全理解，您可以通过 2种不同的方式进行操作：

Well, it looks like you've got some of your code from a different place so just so you can fully understand, you can do this in 2 different ways:

1）要访问任何类型的相关对象，只需简单的 ForeignKey 或 ManyToMany ，您只需要从相反的模型开始，使用set这样的例子：

1) To access a related object of any kind, being a simple ForeignKey or ManyToMany you just need to go from the opposite model and use _set like this example:

class Group(models.Model):
    group_name = models.CharField()

class Contact(models.Model):
    contact_name = models.ForeignKey(Group)

{{ group.contact_set.all }}

2）您可以设置不同于默认设置的名称，更改联系人像这样：

2) You can set up a name different than the default _set changing Contact like this:

class Contact(models.Model):
    contact_name = models.ForeignKey(Group, related_name='contacts')

因此， related_name kwarg为您设置一个新名称，而不是 set 一个：

So, related_name kwarg set a new name for you instead of the _set one:

{{ group.contacts.all }}

我希望我能可以更轻松地访问与模型相关的对象。

I hope I manage to make it clearer about simple access on models related objects.

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