Django ORM (Object-Relational Mapping) is a powerful tool that allows developers to interact with databases using Python code instead of writing raw SQL queries. It abstracts database operations, making it easier to manage relationships between data models.

Core Concepts 🔍

  • Models: Define database tables using Python classes.
    ✅ Example: 
    class Book(models.Model):
    title = models.CharField(max_length=100)
    author = models.ForeignKey(Author, on_delete=models.CASCADE)
  • QuerySet: Used to retrieve and filter data from the database.
    📌 Tip: Use select_related() for optimizing foreign key lookups.
  • Migrations: Automate database schema changes.
    🧱 Automatically generates SQL for model modifications.

Common Operations 🚀

  • Create: 
    Book.objects.create(title="Django for Beginners", author=author_instance)
  • Read: 
    books = Book.objects.filter(author=author_instance).order_by('-title')
  • Update: 
    book = Book.objects.get(id=1)
book.title = "Advanced Django ORM"
book.save()
  • Delete: 
    Book.objects.filter(title="Old Book").delete()

Best Practices 🛡️

  • Always use __str__ or __repr__ methods for model readability.
  • Leverage bulk_create() and bulk_update() for performance optimization.
  • Keep migrations organized with clear commit messages.

Expand Your Knowledge 🌐

📖 Explore Django Models Documentation
🔗 Learn about Django Query Optimization

Django ORM Overview
Database Model Relationships