How to use the tblib.model.session function in tblib

def create_user():
    """注册用户
    """

    data = request.get_json()
    password = data.pop('password')

    user = UserSchema().load(data)
    user.password = password
    session.add(user)
    session.commit()

    return json_response(user=UserSchema().dump(user))

def create_shop():
    """创建店铺
    """

    data = request.get_json()

    shop = ShopSchema().load(data)
    session.add(shop)
    session.commit()

    return json_response(shop=ShopSchema().dump(shop))

def create_address():
    """添加地址
    """

    data = request.get_json()

    address = AddressSchema().load(data)
    session.add(address)
    session.commit()

    return json_response(address=AddressSchema().dump(address))

def create_user():
    """注册用户
    """

    data = request.get_json()
    password = data.pop('password')

    user = UserSchema().load(data)
    user.password = password
    session.add(user)
    session.commit()

    return json_response(user=UserSchema().dump(user))

def create_order():
    """创建订单，订单商品需要一起提交
    """

    data = request.get_json()
    if data.get('pay_amount') is None:
        data['pay_amount'] = sum([x['price'] * x['amount']
                                  for x in data['order_products']])

    order = OrderSchema().load(data)
    session.add(order)
    session.commit()

    return json_response(order=OrderSchema().dump(order))

def create_product():
    """创建商品
    """

    data = request.get_json()

    product = ProductSchema().load(data)
    session.add(product)
    session.commit()

    return json_response(product=ProductSchema().dump(product))

def create_shop():
    """创建店铺
    """

    data = request.get_json()

    shop = ShopSchema().load(data)
    session.add(shop)
    session.commit()

    return json_response(shop=ShopSchema().dump(shop))