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# blog/models.py — relationships and Meta options
from django.db import models
from django.contrib.auth.models import User

class Tag(models.Model):
    name = models.CharField(max_length=50, unique=True)
    slug = models.SlugField(max_length=50, unique=True)

def __str__(self):
        return self.name

class UserProfile(models.Model):
    """One-to-one extension of the built-in User."""
    user    = models.OneToOneField(User, on_delete=models.CASCADE, related_name='profile')
    bio     = models.TextField(blank=True)
    website = models.URLField(blank=True)

def __str__(self):
        return f'Profile of {self.user.username}'

class Post(models.Model):
    author   = models.ForeignKey(User, on_delete=models.CASCADE, related_name='posts')
    tags     = models.ManyToManyField(Tag, blank=True, related_name='posts')
    title    = models.CharField(max_length=200)
    body     = models.TextField()
    views    = models.PositiveIntegerField(default=0)

class Meta:
        ordering       = ['-id']
        verbose_name   = 'Post'
        verbose_name_plural = 'Posts'
        constraints    = [
            models.UniqueConstraint(fields=['author', 'title'], name='unique_author_title'),
        ]
        indexes = [
            models.Index(fields=['author', '-id']),
        ]

def __str__(self):
        return self.title

# Accessing relationships
# user.posts.all()           -> all posts by this user (reverse FK)
# post.tags.all()            -> all tags on this post
# tag.posts.filter(...)      -> all posts with this tag (reverse M2M)
# user.profile               -> OneToOne reverse accessor