Sure, here's the `posts.py` file for the `blog_app_h23t0` FastAPI backend:


from typing import Optional
from sqlalchemy import Column, ForeignKey, Integer, String, Text
from sqlalchemy.orm import relationship
from app.api.db.database import Base

class Posts(Base):
    __tablename__ = 'posts'

    id = Column(Integer, primary_key=True, index=True)
    title = Column(String, nullable=False)
    content = Column(Text, nullable=False)
    user_id = Column(Integer, ForeignKey('users.id'), nullable=False)

    user = relationship('Users', back_populates='posts')
    comments = relationship('Comments', back_populates='post')

    def __repr__(self):
        return f"Posts(id={self.id}, title='{self.title}', user_id={self.user_id})"

Explanation:

1. We import the necessary modules from SQLAlchemy: `Column`, `ForeignKey`, `Integer`, `String`, and `Text`.
6. We define the columns for the `Posts` model:
   - `id`: Integer primary key with index
   - `title`: String column, cannot be null
   - `content`: Text column, cannot be null
   - `user_id`: Integer foreign key referencing the `id` column of the `users` table, cannot be null
7. We define the relationships:
   - `user`: One-to-many relationship with the `Users` model, backref `'posts'`
   - `comments`: One-to-many relationship with the `Comments` model, backref `'post'`

Note: This code assumes that you have a `Users` model defined elsewhere in your project, and that you will define a `Comments` model as well. You may need to adjust the relationship definitions and foreign key constraints based on your project's requirements.