Reverse relationship in Django

This blog post teaches you about the relationship between the child and parent models and vice versa. Let us consider the following School and Student models for example.

Photo by Aditya Romansa on Unsplash

The student model will have the student name and the school model will have the school name alone for simplicity.

This is how our models look like.

from django.db import models


class School(models.Model):
    name = models.CharField(max_length=100)

    def __str__(self):
        return self.name


class Student(models.Model):
    name = models.CharField(max_length=100)
    school = models.ForeignKey(School, on_delete=models.CASCADE, related_name='student')

    def __str__(self):
        return self.name

Direct relationship

In the above Student model, the school field has a foreign key relationship with the school model.

This is an example of a direct relationship. If we wish to get the school name from a student object we can simply do the following.

>>> from student.models import Student
>>> student = Student.objects.all().first()
>>> student
<Student: John>
>>> student.school.name
'Stanford'

Or if you want to query all the students whose school name is ‘Stanford’ we can simply do the following.