检查项目是否包含在ManyToManyField（django）中(Checking if an item is contained in a ManyToManyField (django))

检查项目是否包含在ManyToManyField（django）中(Checking if an item is contained in a ManyToManyField (django))

所以我在Item1和Item2之间有一个ManyToManyField关系。 在网页上，我想根据两个项目是否连接显示两条消息之一。 我只是不确定如何使用{％if％}模板标记查询我的确切项目。

我正在寻找的是什么

{% if Item1 is connected to Item2 %} Display Message1 {% else %} Display Message2 {% endif %}

关于我如何完成这些工作的任何提示？

class Profile(models.Model): user = models.OneToOneField(User) name = models.CharField(max_length=50) eventList = models.ManyToManyField(Event, blank="TRUE", null="TRUE", related_name='event_set+') def __unicode__(self): return self.name

So I have a ManyToManyField relationship between Item1 and Item2. On a webpage, I want to display one of two messages based on whether the two items are connected or not. I'm just not sure how to query my exact item using the {% if %} template tag.

Roughly what I'm looking for is

{% if Item1 is connected to Item2 %} Display Message1 {% else %} Display Message2 {% endif %}

Any tips on how I'd get this done?

class Profile(models.Model): user = models.OneToOneField(User) name = models.CharField(max_length=50) eventList = models.ManyToManyField(Event, blank="TRUE", null="TRUE", related_name='event_set+') def __unicode__(self): return self.name

最满意答案

我仍然不清楚如果连接到其他对象，您希望看到哪个对象，但如果您想知道某个用户是否处于特定事件中，您可以这样做：

{% if event in user.eventList.all %} Display Message1 {% else %} Display Message2 {% endif %}

在现代django版本的条件下，您可以使用operator in 。

希望这可以帮助！

It still not clear to me what object you want to see if connected to other but if you want to know if a user is in an specific event you can do it like this:

{% if event in user.eventList.all %} Display Message1 {% else %} Display Message2 {% endif %}

You can use operator in in if conditions in modern django versions.

Hope this helps!