Django 模型过滤器
我花了过去几个小时查看 Django Docs 和类似的问题，但我仍然不清楚如何解决这个问题......
本质上我想访问与某个组相关的电子邮件地址列表，所以我可以向属于该组的这些客户（名为 group_one、group_two 等）发送电子邮件，
class Group(models.Model):
name = models.CharField(primary_key=True)
mailing_list = models.ManyToManyField("Customer", null=True)
class Customer(models.Model):
name = models.CharField()
email = models.EmailField(primary_key=True)
我已经尝试过
group_mail_list = Group.objects.filter(name=group_two)
这会返回 group_two 的查询对象，但是当我尝试执行 __contains 过滤器时，我收到错误：
TypeError: Related Field has invalid lookup: contains
任何人都可以帮忙我出去吗？不确定是否是因为它是多对多关系？
提前致谢 ：）
I've spent the last few hours looking at Django Docs and similar questions on here but I'm still unclear on how to tackle the problem...
In essense I want to access the list of email addresses relevent to a certain group, so I can send an email to these customers who are part of this group (named group_one, group_two etc)
class Group(models.Model):
name = models.CharField(primary_key=True)
mailing_list = models.ManyToManyField("Customer", null=True)
class Customer(models.Model):
name = models.CharField()
email = models.EmailField(primary_key=True)
I've tried
group_mail_list = Group.objects.filter(name=group_two)
And this returns an Query Object for group_two but when I try to do a __contains filter I get a error:
TypeError: Related Field has invalid lookup: contains
Anyone help me out? Not sure if it's because it's a many-to-many relationship perhaps?
Thanks in advance :)
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那么，您真正想要的是
客户。从表面上看，这似乎违反直觉，因为您想要Group的电子邮件，但该字段位于Customer而不是Group：What you really want is
Customers, then. It seems counter-intuitive on the surface, because you're wanting emails for aGroup, but that field is onCustomernotGroup: