What are Django data models and how do I use them?

What are Django data models and how do I use them?

Django data models are Python classes that define the structure of your database. They allow you to create, retrieve, update, and delete records in your database using an object-oriented approach.

Can you give me an example of a simple data model?

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

from django.db import models

class Post(models.Model):
    title = models.CharField(max_length=200)
    content = models.TextField()
    created_at = models.DateTimeField(auto_now_add=True)

This model has three fields: title, content, and created_at.

How do I create a database table from this model?

To create a database table from your model, you need to run the following commands:

1. python manage.py makemigrations - This creates migration files based on your model changes.
2. python manage.py migrate - This applies the migrations and creates the table in the database.

What if I want to add a new field to my model?

You can simply add a new field to your model class, then run makemigrations and migrate again. For example, to add an author field:

author = models.CharField(max_length=100)