Add new __str__ methods to models

 - This MR adds new __str__ methods to the class to customize the string representation of the objects.

Author: vasudev-gm

apidemo/test_app/models.py

@@ -1,14 +1,21 @@
 from django.db import models
 
+
 # Create your models here.
 # The Department class is a model that represents a department with a title attribute.
 class Department(models.Model):
     title = models.CharField(max_length=100)
 
+    def __str__(self) -> str:
+        return f"{self.title}"
+
 # The Employee class represents an employee with attributes such as first name, last name, department,
 # and birthdate.
 class Employee(models.Model):
     first_name = models.CharField(max_length=100)
     last_name = models.CharField(max_length=100)
     department = models.ForeignKey(Department, on_delete=models.CASCADE)
     birthdate = models.DateField(null=True, blank=True)
+
+    def __str__(self) -> str:
+        return f"{self.first_name} {self.last_name}"