How to set up One2many relationships in Flask SQLAlchemy

class Class(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    students = db.relationship('Students', backref='class')

    def as_dict(self):
        result = {col.name: getattr(self, col.name) for col in self.__table__.columns}
				
				# add students data to result dict
		    result['students'] = [student.as_dict() for student in self.students]
        return result

class Students(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    class_id = db.Column(db.Integer, db.ForeignKey('class.id'))

    def as_dict(self):
        result = {col.name: getattr(self, col.name) for col in self.__table__.columns}
        return result