Openerp POS订单产品总数

我的目标是在ProductForm视图中添加一个字段，该字段将显示此产品在POS机上购买的次数。我真的坚持使用此字段，并很高兴知道如何做到这一点

class Product(models.Model):
    _inherit = 'product.product'

    pos_product_order_total = fields.Char(
        string='Product POS Orders', compute='_product_pos_orders')

    def _product_pos_orders(self):
        Order = self.env['pos.order']
        for product in self:
            domain = [('product_id', '=', product.id)]
            for o in Order.search(domain):
                pass 

尝试以下解决方案：

class Product(models.Model):
    _inherit = 'product.product'

    pos_product_order_total = fields.Char(
        string='Product POS Orders', compute='_product_pos_orders')

    def _product_pos_orders(self):
        OrderLine = self.env['pos.order.line']
        for product in self:
            domain = [('product_id', '=', product.id)]
            product.pos_product_order_total = sum(OrderLine.search(domain).mapped('qty'))