Question

这是一个简单的模型：

class TakingCourse(models.Model):
    course = models.ForeignKey(Course)
    term = models.ForeignKey(Term)

我不想使用Django创建默认主键，而是使用course和term作为主键 - 一起使用，它们唯一地标识一个元组。这是Django允许的吗？

在相关说明中：我试图代表用户以某些方式参加课程。有更好的方法吗？

class Course(models.Model):
    name = models.CharField(max_length=200)
    requiredFor = models.ManyToManyField(RequirementSubSet, blank=True)
    offeringSchool = models.ForeignKey(School)

    def __unicode__(self):
        return "%s at %s" % (self.name, self.offeringSchool)

class MyUser(models.Model):
    user = models.ForeignKey(User, unique=True)
    takingReqSets = models.ManyToManyField(RequirementSet, blank=True)
    takingTerms = models.ManyToManyField(Term, blank=True)
    takingCourses = models.ManyToManyField(TakingCourse, blank=True)
    school = models.ForeignKey(School)

class TakingCourse(models.Model):
    course = models.ForeignKey(Course)
    term = models.ForeignKey(Term)

class Term(models.Model):
    school = models.ForeignKey(School)
    isPrimaryTerm = models.BooleanField()

Answer 1

您可以使用unique_together选项。

class TakingCourse(models.Model):
    course = models.ForeignKey(Course)
    term = models.ForeignKey(Term)

    class Meta:
        unique_together = ('course', 'term')

如果你做这样的事情会更好：

class MyUser(models.Model):
    user = models.OneToOneField(User)
    takingReqSets = models.ManyToManyField(RequirementSet, blank=True)
    takingCourses = models.ManyToManyField(Course, through='TakingCourse', blank=True, null=True)
    school = models.ForeignKey(School)

class TakingCourse(models.Model):
    my_user = models.ForeignKey(MyUser)
    course = models.ForeignKey(Course)
    term = models.ForeignKey(Term)

    class Meta:
         unique_together = ('my_user', 'course')

了解one to one relationships和extra fields on many to many relationships。

Django模型：使用多个值作为关键？

1 个答案: