[IMP] commission_simple: allow use of lambda in inherit of commission result lines

commission_simple/models/commission_result.py

@@ -75,3 +75,7 @@ class CommissionResult(models.Model):
         'salesman_period_company_unique',
         'unique(company_id, partner_id, date_range_id)',
         'A commission result already exists for this salesman/agent for the same period.')]
+
+    def _prepare_xlsx_lines(self):
+        self.ensure_one()
+        return self.line_ids.sorted(key=lambda x: x.move_id.invoice_date)

commission_simple/reports/commission_result_xlsx.py

@@ -53,14 +53,11 @@ class CommissionResultXlsx(models.AbstractModel):
             sheet.write(i, col_vals['pos'], col_vals['label'], styles['col_title'])
             sheet.set_column(col_vals['pos'], col_vals['pos'], col_vals['width'])
         # table content
-        for line in result.line_ids.sorted(key=self._prepare_sort_field()):
+        for line in result._prepare_xlsx_lines():
             i += 1
             for col_key, value in line._prepare_commission_xlsx().items():
                 sheet.write(i, coldict[col_key]["pos"], value, styles[coldict[col_key]["style"]])
 
-    def _prepare_sort_field(self):
-        return "date"
-
     def _prepare_xlsx_cols(self):
         cols = [  # key, label, width, style_suffix
             ("inv.name", _("Invoice"), 14, False),