Here's a `comments.py` file with a SQLAlchemy model for comments, following the FastAPI project structure with SQLite and SQLAlchemy:


from sqlalchemy import Column, ForeignKey, Integer, String, Text
from sqlalchemy.orm import relationship

from app.db.base_class import Base

class Comment(Base):
    __tablename__ = "comments"

    id = Column(Integer, primary_key=True, index=True)
    content = Column(Text, nullable=False)
    author = Column(String, nullable=False)
    post_id = Column(Integer, ForeignKey("posts.id"), nullable=False)

    post = relationship("Post", back_populates="comments")

    def __repr__(self):
        return f"Comment(id={self.id}, content='{self.content[:20]}...', author='{self.author}', post_id={self.post_id})"

Explanation:

5. The `content` column stores the text content of the comment and is required (`nullable=False`).