Question

I have two models that are related together using ForeignKey and related_name is used. Here is an example.

class Student(models.Model):
    name = models.CharField(max_length=255)
    birthday = models.DateField(blank=True)


class Class(models.Model):

    name = models.CharField(max_length=255)
    student = models.ForeignKey(Student,
                                related_name='classes',
                                null=True)

    def __unicode__(self):
        return self.name

For example, I would like to access the class name.

This is what i tried.

john = Student.objects.get(username = 'john')
print john.classes.name

nothing’s get printed.

But when i try john.classes

i get django.db.models.fields.related.RelatedManager object at 0x109911410. This is shows that they are related. But i would like to get the class name.

Am i doing something wrong? How do i access the name of the class using related_name? Need some guidance.

Answer 1

Yes, classes is a manager. It can be several classes for one teacher. So to output their names you should do:

john = Student.objects.get(username='john')
for class2 in john.classes.all():
   print class2.name

If you want only one class for one student then use one-to-one relation. In this case you can access the related field with your method.