Migrations concept and workflow in Django - Mini Project: Build & Apply

Understanding Django Migrations Concept and Workflow

📖 Scenario: You are building a simple Django app to manage a library's book collection. You need to create a model for books and understand how Django migrations help keep your database structure in sync with your models.

🎯 Goal: Learn how to create a Django model, generate migrations, and apply them to update the database schema step-by-step.

📋 What You'll Learn

Create a Django model named Book with fields title (CharField) and author (CharField).

Create a variable to hold the migration name.

Generate a migration file using the migration name variable.

Apply the migration to update the database.

💡 Why This Matters

🌍 Real World

Django migrations help developers keep the database structure in sync with their code models, making it easier to manage changes over time.

💼 Career

Understanding migrations is essential for backend developers working with Django to maintain and deploy database changes safely.

1

Create the Book model

In your Django app's models.py, create a model class called Book with two fields: title as a CharField with max length 100, and author as a CharField with max length 50.

Django

# 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=...) for the fields.

2

Create a migration name variable

Create a variable called migration_name and set it to the string 'create_book_model' to name your migration.

Django

from django.db import models

class Book(models.Model):
    title = models.CharField(max_length=100)
    author = models.CharField(max_length=50)

# Create a variable migration_name with value 'create_book_model'
# Your code here

Need a hint?

Just assign the string 'create_book_model' to the variable migration_name.

3

Generate the migration file

Use the migration_name variable to generate a migration by writing the command python manage.py makemigrations --name create_book_model as a comment in your code to show the command you will run.

Django

from django.db import models

class Book(models.Model):
    title = models.CharField(max_length=100)
    author = models.CharField(max_length=50)

migration_name = 'create_book_model'

# Write the command to generate migrations using migration_name
# Your code here

Need a hint?

Write the exact command as a comment, replacing the migration name with the variable's value.

4

Apply the migration to update the database

Write the command python manage.py migrate as a comment to apply the migration and update the database schema.

Django

from django.db import models

class Book(models.Model):
    title = models.CharField(max_length=100)
    author = models.CharField(max_length=50)

migration_name = 'create_book_model'

# python manage.py makemigrations --name create_book_model

# Write the command to apply migrations
# Your code here

Need a hint?

Write the exact command python manage.py migrate as a comment.