[FIX] website_sale_coupon: update freeshipping on delivery change

Since this module is not bridged to website_sale_delivery, there was no support for changing the freeshipping line
when changing the delivery carrier

Now it has, at the price of ugly code

OPW 1871526

closes odoo/enterprise#2651

controllers/main.py

@@ -27,3 +27,27 @@ class WebsiteSale(WebsiteSale):
         order = request.website.sale_get_order()
         order.recompute_coupon_lines()
         return super(WebsiteSale, self).cart(**post)
+
+    def _update_website_sale_coupon(self, **post):
+        order = request.website.sale_get_order()
+        order.recompute_coupon_lines()
+        free_shipping_lines = order._get_free_shipping_lines()
+        currency = order.currency_id
+        result = {}
+        if free_shipping_lines:
+            amount_free_shipping = sum(free_shipping_lines.mapped('price_subtotal'))
+            result.update({
+                'new_amount_delivery': self._format_amount(0.0, currency),
+                'new_amount_untaxed': self._format_amount(order.amount_untaxed, currency),
+                'new_amount_tax': self._format_amount(order.amount_tax, currency),
+                'new_amount_total': self._format_amount(order.amount_total, currency),
+                'new_amount_order_discounted': self._format_amount(order.reward_amount - amount_free_shipping, currency)
+            })
+        return result
+
+    # Override
+    # Add in the rendering the free_shipping_line
+    def _get_shop_payment_values(self, order, **kwargs):
+        values = super(WebsiteSale, self)._get_shop_payment_values(order, **kwargs)
+        values['free_shipping_lines'] = order._get_free_shipping_lines()
+        return values

models/sale_order.py

@@ -61,3 +61,11 @@ class SaleOrder(models.Model):
         res = super(SaleOrder, self)._cart_update(product_id=product_id, line_id=line_id, add_qty=add_qty, set_qty=set_qty, attributes=attributes, **kwargs)
         self.recompute_coupon_lines()
         return res
+
+    def _get_free_shipping_lines(self):
+        self.ensure_one()
+        free_shipping_prgs_ids = self.no_code_promo_program_ids.filtered(lambda p: p.reward_type == 'free_shipping')
+        if not free_shipping_prgs_ids:
+            return self.env['sale.order.line']
+        free_shipping_product_ids = free_shipping_prgs_ids.mapped('discount_line_product_id')
+        return self.order_line.filtered(lambda l: l.product_id in free_shipping_product_ids)

views/website_sale_templates.xml

@@ -79,4 +79,10 @@
         </div>
     </xpath>
 </template>
+
+<template id="payment" name="Payment" inherit_id="website_sale.payment">
+    <xpath expr="//table[@id='cart_products']/tbody/tr/td[hasclass('td-price')]/child::*" position="attributes">
+        <attribute name="t-att-style">'display: None;' if line in free_shipping_lines else ''</attribute>
+    </xpath>
+</template>
 </odoo>