models.py

from app import db, login_manager
from flask_login import UserMixin
from datetime import datetime

class User(UserMixin, db.Model):
    __tablename__ = "user"
    
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True, nullable=False)
    email = db.Column(db.String(120), unique=True, nullable=False)
    password = db.Column(db.String(300), nullable=False, unique=True)
    date_created = db.Column(
            db.DateTime, nullable=False, default=datetime.utcnow)
    posts = db.relationship('Post', backref='author', lazy=True)

    def __repr__(self):
        return f'{self.__class__.__name__}({self.id}, {self.username})'

@login_manager.user_loader
def load_user(user_id):
    return User.query.get(int(user_id))

from sqlalchemy.dialects.mysql import LONGTEXT

class Post(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.Text, nullable=False)
    date = db.Column(db.DateTime, nullable=False, default=datetime.now)
    content = db.Column(db.Text, nullable=False)
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False)
    
    def __repr__(self):
        return f'{self.__class__.__name__}({self.id}, {self.title})'

class Question(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(200), nullable=False)
    details = db.Column(db.Text, nullable=False)
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False)
    user = db.relationship('User', backref='questions')
    answers = db.relationship('Answer', backref='question', lazy=True)

class Answer(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    text = db.Column(db.Text, nullable=False)
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False)
    user = db.relationship('User', backref='answers')
    question_id = db.Column(db.Integer, db.ForeignKey('question.id'))