# Django Model Example

Database models with Django

## Code Example

```python
# Django Models Example
from django.db import models
from django.contrib.auth.models import User
from django.core.validators import MinValueValidator, MaxValueValidator
from django.utils import timezone

class Category(models.Model):
    name = models.CharField(max_length=100, unique=True)
    description = models.TextField(blank=True)
    created_at = models.DateTimeField(auto_now_add=True)
    
    class Meta:
        verbose_name_plural = "Categories"
        ordering = ['name']
    
    def __str__(self):
        return self.name

class Product(models.Model):
    STATUS_CHOICES = [
        ('draft', 'Draft'),
        ('published', 'Published'),
        ('archived', 'Archived'),
    ]
    
    name = models.CharField(max_length=200)
    description = models.TextField()
    price = models.DecimalField(max_digits=10, decimal_places=2)
    category = models.ForeignKey(Category, on_delete=models.CASCADE, related_name='products')
    status = models.CharField(max_length=20, choices=STATUS_CHOICES, default='draft')
    stock_quantity = models.PositiveIntegerField(default=0)
    rating = models.FloatField(
        validators=[MinValueValidator(0.0), MaxValueValidator(5.0)],
        null=True, blank=True
    )
    created_by = models.ForeignKey(User, on_delete=models.CASCADE)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    
    class Meta:
        ordering = ['-created_at']
        indexes = [
            models.Index(fields=['category', 'status']),
            models.Index(fields=['price']),
        ]
    
    def __str__(self):
        return self.name
    
    def is_in_stock(self):
        return self.stock_quantity > 0
    
    def get_discount_price(self, discount_percent):
        return self.price * (1 - discount_percent / 100)

class ProductImage(models.Model):
    product = models.ForeignKey(Product, on_delete=models.CASCADE, related_name='images')
    image = models.ImageField(upload_to='products/')
    alt_text = models.CharField(max_length=200, blank=True)
    is_primary = models.BooleanField(default=False)
    created_at = models.DateTimeField(auto_now_add=True)
    
    class Meta:
        ordering = ['-is_primary', 'created_at']
```

## Files

- models.py
- admin.py
- views.py
- serializers.py

## Usage

```bash
# Install dependencies
npm install

# Run the example
npm start
```