Question

I have a task:

• To make a database model with essentially ‘student’ and ‘group’.
• ‘Student’ contains: ‘Name’, ‘student ID card’, ‘group’ (must be ForeigKey to Group!)
• ‘Group’ contains: ‘group name’ and ‘captain’ (must be foreign key to Student!)

Now I have a collision – right straight it’s impossible. So I did it in this way:

class Group(models.Model):
    group_name = models.CharField(max_length=50)    


class Student(models.Model):
    name = models.CharField(max_length=50)
    birth_date = models.DateField()
    std_ID_card = models.IntegerField()
    group = models.ForeignKey(Group)


class Captain(models.Model):
    student = models.OneToOneField(Student)
    group = models.OneToOneField(Group)

Do I have more elegant and correct way to do this?

Answer 1

Try to add a related_name:

class Student(models.Model):
    name = models.CharField(max_length=50)
    birth_date = models.DateField()
    std_ID_card = models.IntegerField()
    group = models.ForeignKey('Group')

class Group(models.Model):
    group_name = models.CharField(max_length=50)    
    captain = models.ForeignKey('Student', related_name='%(class)s_captain')