String representation with __str__ in Django - Mini Project: Build & Apply

String representation with __str__ in Django models

📖 Scenario: You are building a simple Django app to manage a library's book collection. Each book has a title and an author.When you view the list of books in the Django admin or in the Django shell, you want to see a friendly name for each book instead of the default object representation.

🎯 Goal: Create a Django model called Book with fields for title and author. Then add a __str__ method to return a readable string like "Title by Author".

📋 What You'll Learn

Create a Django model named Book with title and author fields

Add a __str__ method to the Book model

The __str__ method should return a string formatted as "{title} by {author}"

Use exact variable and method names as specified

💡 Why This Matters

🌍 Real World

Customizing the string representation of models helps developers and admins quickly identify records in Django admin and shell.

💼 Career

Knowing how to add __str__ methods is a basic skill for Django developers to improve code readability and user experience.

1

Create the Book model with title and author fields

Create a Django model class called Book with two fields: title and author, both as models.CharField with max_length=100.

Django

from django.db import models

# Define the Book model with title and author fields
# Your code here

Need a hint?

Use class Book(models.Model): to define the model. Use models.CharField(max_length=100) for both fields.

2

Add a __str__ method to the Book model

Add a method called __str__ inside the Book model class that returns a string. For now, return the title field only.

Django

from django.db import models

class Book(models.Model):
    title = models.CharField(max_length=100)
    author = models.CharField(max_length=100)

    # Add __str__ method returning title
    # Your code here

Need a hint?

Define def __str__(self): and return self.title.

3

Update __str__ to include author in the string

Modify the __str__ method to return a string formatted as "{title} by {author}" using an f-string.

Django

from django.db import models

class Book(models.Model):
    title = models.CharField(max_length=100)
    author = models.CharField(max_length=100)

    def __str__(self):
        # Return title and author formatted as 'Title by Author'
        # Your code here

Need a hint?

Use an f-string: return f"{self.title} by {self.author}".

4

Complete the model with proper indentation and imports

Ensure the entire Book model code includes the import statement, class definition, fields, and the __str__ method exactly as shown.

Django

from django.db import models

class Book(models.Model):
    title = models.CharField(max_length=100)
    author = models.CharField(max_length=100)

    def __str__(self):
        return f"{self.title} by {self.author}"

# Your code here if needed

Need a hint?

Check that all parts are present and properly indented.