python - Django模型ForeignKey关系

Question

我有 3 个模型:用户、类(class)、公司

class User(models.Model):
    pass

class Company(models.Model):
    pass  

class Lesson(models.Model):
    user = models.ForeignKey(User)
    company = models.ForeignKey(Company)

如何为两家公司添加一个类

Answer 1

如果一个公司有多个类(class)，并且您也希望一个类(class)有多个公司，你应该使用ManyToManyField

class Lesson(models.Model):
    user = models.Foreignkey(User)
    companies = models.ManyToManyField(Company)

c1 = Company()
c1.save()
c2 = Company()
c2.save()

l1 = Lesson()
l1.companies.add(c1, c2)