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x1vi@x1vi-Inspiron-5558:~/development/python/dbPractice/djangoDBPractice/socialMediaApp$ cat models.py 
from django.db import models

class User(models.Model):
    username = models.CharField(max_length=255, unique=True)
    password = models.CharField(max_length=128)
    profile_pic_url = models.CharField(max_length=255, blank=True)
    authored_posts = models.ForeignKey('Post', on_delete=models.CASCADE, related_name='authors', null=True, blank=True)
    primary_comment_on_post = models.ForeignKey('Comment', on_delete=models.CASCADE, related_name='primary_commenter', null=True, blank=True)
    authored_replies = models.ForeignKey('Reply', on_delete=models.CASCADE, related_name='repliers', null=True, blank=True)
    comments = models.ForeignKey('Comment', on_delete=models.CASCADE, related_name='commenters')
    likes = models.ForeignKey('Post', on_delete=models.CASCADE, related_name='liked_by_users')
    created_at = models.DateTimeField(auto_now_add=True)

def __str__(self):
        return self.username

class Post(models.Model):
    image_url = models.CharField(max_length=255)
    description = models.TextField()
    author = models.ForeignKey(User, on_delete=models.CASCADE, related_name='posts')
    comments = models.ForeignKey('Comment', on_delete=models.CASCADE, related_name='posted_on')
    likes = models.ForeignKey(User, on_delete=models.CASCADE, related_name='liked_posts')
    created_at = models.DateTimeField(auto_now_add=True)

def __str__(self):
        return f"Post: {self.description[:20]}"

class Comment(models.Model):
    description = models.TextField()
    post = models.ForeignKey(Post, on_delete=models.CASCADE, related_name='post_comments')
    author = models.ForeignKey(User, on_delete=models.CASCADE, related_name='authored_comments')
    replies = models.ForeignKey('Reply', on_delete=models.CASCADE, related_name='commented_on')
    likes = models.ForeignKey(User, on_delete=models.CASCADE, related_name='liked_comments')
    created_at = models.DateTimeField(auto_now_add=True)

def __str__(self):
        return f"Comment on Post {self.post.id}: {self.description[:20]}"

class Reply(models.Model):
    description = models.TextField()
    comment = models.ForeignKey(Comment, on_delete=models.CASCADE, related_name='comment_replies')
    author = models.ForeignKey(User, on_delete=models.CASCADE, related_name='replies')
    likes = models.ForeignKey(User, on_delete=models.CASCADE, related_name='liked_replies')
    created_at = models.DateTimeField(auto_now_add=True)

def __str__(self):
        return f"Reply on Comment {self.comment.id}: {self.description[:20]}"

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stats: 48 lines, 156 words, 2.64kb