models.py

from exts import db
from datetime import datetime

class UserModel(db.Model):
    __tablename__ = 'users'
    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    username = db.Column(db.String(100), unique=True, nullable=False)
    password = db.Column(db.String(500), nullable=False)
    email = db.Column(db.String(100), unique=True, nullable=False)
    join_time = db.Column(db.DateTime, default=datetime.now)

class EmailCaptchaModel(db.Model):
    __tablename__ = 'email_captcha'
    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    email = db.Column(db.String(100), unique=True, nullable=False)
    captcha = db.Column(db.String(100), nullable=False)

class PostModel(db.Model):
    __tablename__ = 'posts'
    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    title = db.Column(db.String(100), nullable=False)
    content = db.Column(db.Text, nullable=False)
    create_time = db.Column(db.DateTime, default=datetime.now)
    author_id = db.Column(db.Integer, db.ForeignKey('users.id'))
    author = db.relationship('UserModel', backref='posts')

class CommentModel(db.Model):
    __tablename__ = 'comments'
    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    content = db.Column(db.Text, nullable=False)
    create_time = db.Column(db.DateTime, default=datetime.now)

    # ForeignKey
    post_id = db.Column(db.Integer, db.ForeignKey('posts.id'))
    author_id = db.Column(db.Integer, db.ForeignKey('users.id'))

    # Relationship
    post = db.relationship('PostModel', backref=db.backref('comments', order_by=create_time.desc()))
    author = db.relationship('UserModel', backref='comments')