Django 2. How do I refer to a model by linking to other models in a template?

Question

Django

There are 3 models:

class User(AbstractUser):
    is_student = models.BooleanField('student status', default=False)
    is_teacher = models.BooleanField('teacher status', default=False)
    father_name = models.CharField(max_length = 30, db_index = True,null = True)
    photo = models.ImageField(db_index = True,null = True,blank = True)
    avatarka = models.ImageField(db_index = True,null = True,blank = True)
    date_of_birth = models.DateField(auto_now=False, auto_now_add=False,null = True,blank = True)
    number = PhoneNumberField(null = True,blank = True)

    class Meta:
    	db_table = 'usertest'


class Student(models.Model):
  user = models.OneToOneField(User, on_delete=models.CASCADE, primary_key=True,related_name = 'student')
  class Meta:
    db_table = 'students'

class School_Class(models.Model):
  number = models.IntegerField(db_index = True,unique = True)
  student = models.ForeignKey(Student,related_name = 'school_class',null = True,
      on_delete = models.SET_NULL)
  
  class Meta:
    db_table = 'school_class'

  def __str__(self):
    return str(self.number)

How can I refer to the School_Class model in the template, provided that only the value of the User model, that is, the user model, is passed in the template (it can be accessed in the template, even if it is not passed using context ). I tried something like: But as a result of such an appeal, I get exactly nothing. There is no error, no text with cell value.
<h3>{{ user.student.school_class.number }}</h3>

Answer 1

user.student.school_class.number is not called. You can use queryset user.student.school_class.all
Or you can make a method or property in the model with the data you need in the templates and not mock those who will read the code in six months or a year.