I'm trying to set the default value of 

warehouse_ids in sale.order.line model to the value of the default_sales_order_location in the res.user modell

else it will be the value of the warehouse of the product that is selected in order line

but it doesn't work 
the code:

from odoo import models , fields,api,_
class SaleOrder(models.Model):
   _inherit = 'sale.order'

class SaleOrderLine(models.Model):
   _inherit = 'sale.order.line'

   warehouse_ids = fields.Many2one('stock.warehouse',string="Warehouse " ,default=lambda self: self.default_warehouse())

   def default_warehouse(self):
       if self.env.user.default_sales_order_location:
           return self.env.user.default_sales_order_location
       else:
           return super.product_id.warehouse_ids

class ProductTemplate(models.Model):
   _inherit = 'product.template'
   warehouse_ids = fields.Many2one('stock.warehouse', string="Default Warehouse location ")

class ProductProduct(models.Model):
   _inherit = 'product.product'
   warehouse_ids = fields.Many2one('stock.warehouse',string="Default Warehouse location ")

class ResUsers(models.Model):
    _inherit = 'res.users'
    default_sales_order_location=fields.Many2one('stock.warehouse',string="Default_Sale_Order_Location ")