models.py

from extensions import db
from sqlalchemy.orm import relationship
from flask_login import UserMixin


class User(UserMixin, db.Model):
    __tablename__ = 'users'
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String, nullable=False)
    email = db.Column(db.String, nullable=False)
    password = db.Column(db.String, nullable=False)
    playlists = relationship('Playlist', back_populates='user')


class Playlist(db.Model):
    __tablename__ = 'playlists'
    id = db.Column(db.Integer, primary_key=True)
    user_id = db.Column(db.Integer, db.ForeignKey('users.id'))
    user = relationship("User", back_populates='playlists')
    original_date = db.Column(db.String, nullable=False)
    date = db.Column(db.String, nullable=False)
    link = db.Column(db.String, nullable=False)