MODELS.PY (what is important from it)
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likes = db.Table('likes',
    db.Column('user_likes', db.Integer, db.ForeignKey('user.id')),
    db.Column('artist_liked', db.Integer, db.ForeignKey('artist.id'))
)


class User(db.Model):
    id = db.Column(db.Integer, primary_key = True)
    nickname = db.Column(db.String(64), unique = True)
    liked = db.relationship('Artist',
        secondary = likes,
        backref = db.backref('likes', lazy = 'dynamic'),
        lazy = 'dynamic')

    def similar_artists(self, user):
        return self.liked.intersect(user.liked).order_by(Artist.name)

    def match(self):
        ???


class Artist(db.Model):
    id = db.Column(db.Integer, primary_key = True)
    name = db.Column(db.String(40))