add field allow discount

sale.py

@@ -43,6 +43,13 @@ class Sale(metaclass=PoolMeta):
                 del v['unit_price_w_tax']
             v['type'] = 'line'
             product = Product(v['product'])
+
+            if v.get('discount') and v['discount'] != '':
+                v['discount'] = Decimal(v['discount'])/100
+                unit_price = product.list_price - (product.list_price * Decimal(v['discount']))
+                v['unit_price'] = Decimal(unit_price).quantize(Decimal(str(10.0 ** -4)))
+            elif v.get('discount'):
+                del v['discount']
             v['unit'] = product.template.default_uom.id
             v['description'] = product.name
             taxes = list(product.account_category.customer_taxes_used)
@@ -87,6 +94,11 @@ class Sale(metaclass=PoolMeta):
             'lines': [('create', args['lines'])],
         }
         sale, = cls.create([to_create])
+        for line in sale.lines:
+            if line.discount and line.discount > 0:
+                line.on_change_discount()
+                print(line.discount, line.unit_price, line.unit_price_w_tax, 'valores resultados')
+
         cls.quote([sale])
         record = args.copy()
         record.update({
@@ -288,7 +300,9 @@ class AppDelivery(ModelSQL, ModelView):
 class AppSaleOrder(ModelSQL, ModelView):
     'App Sale Order'
     __name__ = 'dash.app.sale_order'
+    
     company = fields.Many2One('company.company', 'Company', required=True)
+    allow_discount = fields.Boolean('Allow Discount')
 
     @classmethod
     def __setup__(cls):

view/app_sale_order_form.xml

@@ -4,4 +4,6 @@ The COPYRIGHT file at the top level of this repository contains the full copyrig
 <form>
   <label name="company"/>
   <field name="company" widget="selection"/>
+  <label name="allow_discount"/>
+  <field name="allow_discount" />
 </form>