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models.py

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+import re
+from datetime import datetime
+
+from flask_login import UserMixin
+
+from extensions import db, bcrypt
+
+#Users
+class User(UserMixin, db.Model):
+    __tablename__ = "user"
+
+    id = db.Column(db.Integer, primary_key=True)
+    username = db.Column(db.String(100), unique=True, nullable= False)
+    email = db.Column(db.String(120), unique=True, nullable = False)
+    password_hash = db.Column(db.String(200), nullable=False)
+    created_at = db.Column(db.DateTime, nullable=False, default=datetime.utcnow)
+  
+    playlist = db.relationship("Playlist", back_populates="user", lazy="dynamic")
+
+    def set_password(self, plain_password: str):
+        if not plain_password or len(plain_password) < 8:
+            raise ValueError("Password must be at least 8 characters!")
+        if not re.search(r"[A-Z]", plain_password):
+            raise ValueError("Password must include one uppercase letter")
+        if not re.search(r"[\d]", plain_password):
+            raise ValueError("Password must include one number")
+
+        self.password_hash = (
+        bcrypt.generate_password_hash(
+            plain_password
+        ).decode("utf-8")
+    )
+        
+    def check_password(self, plain_password: str) -> bool:
+        return bcrypt.check_password_hash(self.password_hash, plain_password)
+    def __repr__(self):
+        return f"<User id={self.id} username={self.username!r}>"
+#Saves the playlist that the users makes
+class Playlist(db.Model):
+    id= db.Column(db.Integer, primary_key=True)
+    
+    name = db.Column(db.String(100))
+    description = db.Column(db.String(255))
+
+    spotify_playlist_id = db.Column(db.String(120))
+    spotify_url = db.Column(db.String(300))
+    user_id = db.Column(db.Integer, db.ForeignKey("user.id"), nullable=False)
+    
+    user = db.relationship("User", backref="playlists")
+    tracks = db.relationship(
+        "Tracks",
+        backref ="playlist",
+        cascade="all, delete"
+    )
+
+#Saves every song in the playlist
+class Tracks(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    name = db.Column(db.String(255))
+    artist = db.Column(db.String(255))
+
+    playlist_id = db.Column(
+        db.Integer, 
+        db.ForeignKey("playlist.id")
+    )
+