Fask Create new schema and create tables to that schema using SQLAlchemy

main.py

import sqlalchemy
from flask_sqlalchemy import SQLAlchemy
from sqlalchemy import create_engine
from app import db

# engine = create_engine(app.config['SQLALCHEMY_DATABASE_URI'])
#             if not engine.dialect.has_schema(engine, schema_name):
#                 engine.execute(sqlalchemy.schema.CreateSchema(schema_name))
#             insp = sqlalchemy.inspect(engine)
#             if engine.dialect.has_schema(engine, schema_name):
#                 # for table in db.Model.metadata.tables:
#                 for mapper in db.Model.registry.mappers:
#                     if not insp.has_table(mapper.class_, schema=schema_name):
#                         mapper.class_.__table__.schema = schema_name
#                         mapper.class_.__table__.create(engine)
            db.session.execute('CREATE SCHEMA IF NOT EXISTS "{}";'.format(subdomain))
            db.session.commit()
            db.session.execute('SET search_path TO "{}";'.format(subdomain))
            db.session.commit()
            db.create_all(bind=None)