How do I use Django ORM for models and migrations?

How do I use Django ORM for models and migrations?

Django ORM allows you to define your database models as Python classes. You can create migrations to apply changes to your database schema.

Can you show me an example of a model and how to create a migration for it?

Sure! Here's a simple model for a blog post:

from django.db import models

class Post(models.Model):
    title = models.CharField(max_length=100)
    content = models.TextField()
    created_at = models.DateTimeField(auto_now_add=True)

To create a migration, run python manage.py makemigrations and then python manage.py migrate.

What if I want to change a field in my model?

You can modify the field in your model class and then run makemigrations again. Django will detect the change and create a new migration for you.

Is there a way to roll back migrations?

Yes, you can roll back migrations using the command python manage.py migrate app_name migration_name. This will revert to the specified migration.