如何在 Django 中创建依赖模型关系
我正在尝试为以下场景创建一个 Django 模型：
有几个俱乐部。每个俱乐部都有一名领导者和多名成员。领导者也是会员。
到目前为止，这些是我的模型：
class Club(models.Model):
name = models.CharField(max_length=50)
leader = models.ForeignKey('Member', related_name='+')
class Member(models.Model):
name = models.CharField(max_length=50)
club = models.ForeignKey(Club)
在管理界面中，如果不先创建俱乐部，我就无法添加成员，但如果不创建指定为领导者的成员，我就无法创建俱乐部。我尝试将 Blank=True 添加到领导者foreignkey关系中，但仍然不起作用。
我应该如何针对这种情况创建模型？
提前致谢！
I am trying to create a Django model for the following scenario:
There are several Clubs. Each Club has a single leader and several members. The leader is also a member.
These are my models so far:
class Club(models.Model):
name = models.CharField(max_length=50)
leader = models.ForeignKey('Member', related_name='+')
class Member(models.Model):
name = models.CharField(max_length=50)
club = models.ForeignKey(Club)
In the admin interface, I can't add a member without first making a club, but I can't make a club without creating a member to designate as the leader. I tried adding Blank=True to the leader ForeignKey relationship, but it still doesn't work.
How should I create the models for the situation?
Thanks in advance!
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（2）
创建一个 ClubLeader 模型类，其中列作为俱乐部的外键，而会员则作为领导者。强制该表中俱乐部+会员 ID 的唯一性，以确保您没有多个领导者。从您的俱乐部班级中删除“领导者”。
另外，我不会加入任何有像我这样的人作为会员的俱乐部（格劳乔·马克思）
Create a ClubLeader model class, with columns as Foreign Keys to a Club and a Member to be the leader. Enforce uniqueness for Club+Member ids in that table to make sure you dont have multiple leaders. Remove 'leader' from your Club class.
Also, I wouldn't join any club that would have someone like me for a member (Groucho Marx)
有关详细信息，Blank=True 并不意味着数据库中的字段可以为空。它仅意味着使用 ModelForm 时表单字段可以为空（或者可能只是管理员 - 任一/或）。您想要的是
blank=True, null=True。这允许在表单/管理面板中使用空值和空白值。不过，我仍然会同意 Spacedman 的回答。提供一张位于“中间”的单独桌子。这样，您就可以强制要求会员必须属于某个俱乐部。
For further information, Blank=True doesn't mean that the field in the database can be null. It only means that a form field can be blank when using a ModelForm (Or perhaps just the admin - either/or). What you want is a
blank=True, null=True. That allows a null value, and a blank value in the form/admin panel.I would still go with Spacedman's answer though. Provide a separate table that sits 'inbetween'. This way, you enforce that Members must belong to a club.