[FIX] sale_management: update global discount when order lines change

sale_order_discount/__init__.py

@@ -0,0 +1,2 @@
+from . import models
+from . import wizard

sale_order_discount/__manifest__.py

@@ -0,0 +1,10 @@
+{
+    'name': "Sale Order Discount",
+    'version': "1.0",
+    'category': "Sales",
+    'description': "Updates global discount when order lines are changed",
+    'depends': ['sale_management'],
+    'auto_install': True,
+    'author': "times",
+    'license': "LGPL-3",
+}

sale_order_discount/models/__init__.py

@@ -0,0 +1 @@
+from . import sale_order

sale_order_discount/models/sale_order.py

@@ -0,0 +1,62 @@
+import re
+from odoo import _, api, fields, models
+from odoo.tools import float_repr
+
+
+class SaleOrder(models.Model):
+    _inherit = 'sale.order'
+
+    global_discount_percentage = fields.Float()
+
+    @api.onchange('order_line')
+    def _onchange_update_global_discount(self):
+        discount_lines = self.env['sale.order.line']
+        product_lines = self.env['sale.order.line']
+
+        for line in self.order_line:
+            if line._is_global_discount():
+                discount_lines += line
+            if not line._is_global_discount():
+                product_lines += line
+
+        if not discount_lines:
+            return
+
+        if not product_lines:
+            self.order_line -= discount_lines
+            return
+
+        subtotal = sum(product_lines.mapped('price_subtotal'))
+
+        for discount_line in discount_lines:
+
+            discount_dp = self.env['decimal.precision'].precision_get('Discount')
+            origin_record = self.env['sale.order'].browse(self.id.origin)
+
+            match = re.search(r"(\d+(?:\.\d+)?)", discount_line.name)
+            discount_from_name = float(match.group(1)) if match else False
+
+            if not discount_from_name:
+                self.env.user._bus_send("simple_notification", {
+                    'type': 'danger',
+                    'title': _("Error"),
+                    'message': _("Discounts should be in Float(0.00%)")
+                })
+                percent = origin_record.global_discount_percentage
+
+                discount_line.name = _(
+                    "Discount %(percent)s%%",
+                    percent=float_repr(percent, discount_dp),
+                )
+                return
+
+            if discount_from_name != self.global_discount_percentage:
+                origin_record.global_discount_percentage = discount_from_name
+
+            percent = origin_record.global_discount_percentage
+
+            discount_line.name = _(
+                "Discount %(percent)s%%",
+                percent=float_repr(percent, discount_dp),
+            )
+            discount_line.price_unit = -(subtotal * (percent / 100))

sale_order_discount/wizard/__init__.py

@@ -0,0 +1 @@
+from . import sale_order_discount

sale_order_discount/wizard/sale_order_discount.py

@@ -0,0 +1,10 @@
+from odoo import models
+
+
+class SaleOrderDiscount(models.TransientModel):
+    _inherit = 'sale.order.discount'
+
+    def _prepare_global_discount_so_lines(self, base_lines):
+        res = super()._prepare_global_discount_so_lines(base_lines)
+        self.sale_order_id.global_discount_percentage = self.discount_percentage * 100
+        return res