[FIX] website_sale: website_order_line becomes computed field

Fix on sale_coupon (enterprise) https://github.com/odoo/enterprise/pull/2224 needs this change to be able to merge
SO lines when a program generates multiple discount lines on different taxes.

Closes #24971
task-1866977
task-1832967
task-1857843

addons/website_sale/models/sale_order.py

@@ -14,8 +14,9 @@ class SaleOrder(models.Model):
     _inherit = "sale.order"
 
     website_order_line = fields.One2many(
-        'sale.order.line', 'order_id',
-        string='Order Lines displayed on Website', readonly=True,
+        'sale.order.line',
+        compute='_compute_website_order_line',
+        string='Order Lines displayed on Website',
         help='Order Lines to be displayed on the website. They should not be used for computation purpose.',
     )
     cart_quantity = fields.Integer(compute='_compute_cart_info', string='Cart Quantity')
@@ -23,6 +24,10 @@ class SaleOrder(models.Model):
     payment_tx_id = fields.Many2one('payment.transaction', string='Transaction', copy=False)
     only_services = fields.Boolean(compute='_compute_cart_info', string='Only Services')
 
+    @api.one
+    def _compute_website_order_line(self):
+        self.website_order_line = self.order_line
+
     @api.multi
     @api.depends('website_order_line.product_uom_qty', 'website_order_line.product_id')
     def _compute_cart_info(self):

addons/website_sale_delivery/models/sale_order.py

@@ -18,11 +18,11 @@ class SaleOrder(models.Model):
     has_delivery = fields.Boolean(
         compute='_compute_has_delivery', string='Has delivery',
         help="Has an order line set for delivery", store=True)
-    website_order_line = fields.One2many(
-        'sale.order.line', 'order_id',
-        string='Order Lines displayed on Website', readonly=True,
-        domain=[('is_delivery', '=', False)],
-        help='Order Lines to be displayed on the website. They should not be used for computation purpose.')
+
+    @api.one
+    def _compute_website_order_line(self):
+        super(SaleOrder, self)._compute_website_order_line()
+        self.website_order_line = self.website_order_line.filtered(lambda l: not l.is_delivery)
 
     @api.depends('order_line.price_unit', 'order_line.tax_id', 'order_line.discount', 'order_line.product_uom_qty')
     def _compute_amount_delivery(self):