Django检查ManyToMany字段中的对象 [英] Django check if object in ManyToMany field

问题描述

我有一个很简单的问题要解决。我有一个具有> = 0用户关联的合作伙伴模型：

I have quite a simple problem to solve. I have Partner model which has >= 0 Users associated with it:

class Partner(models.Model):
    name = models.CharField(db_index=True, max_length=255)
    slug = models.SlugField(db_index=True)
    user = models.ManyToManyField(User)

现在，如果我有一个User对象和一个Partner对象，检查用户是否与Partner关联的最Python方式是什么？我基本上想要一个语句，如果 User 与 Partner 相关联，则返回True。

Now, if I have a User object and I have a Partner object, what is the most Pythonic way of checking if the User is associated with a Partner? I basically want a statement which returns True if the User is associated to the Partner.

我尝试过：

users = Partner.objects.values_list('user', flat=True).filter(slug=requested_slug)
if request.user.pk in users:
    # do some private stuff

此方法有效，但我觉得有更好的方法。此外，将其轻松放入装饰器中时，请记住，我需要一个命名参数（ slug ）和一个请求对象（ user ）。

This works but I have a feeling there is a better way. Additionally, would this be easy to roll into a decorator, baring in mind I need both a named parameter (slug) and a request object (user).

任何帮助将不胜感激。

推荐答案

if user.partner_set.filter(slug=requested_slug).exists():
     # do some private stuff

这篇关于Django检查ManyToMany字段中的对象的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！