[FIX] strong typing required when comparing values in python3

beesdoo_product/models/beesdoo_product.py

@@ -3,6 +3,7 @@
 
 import logging
 import uuid
+from datetime import date
 
 from odoo import api, fields, models
 from odoo.exceptions import UserError, ValidationError
@@ -95,9 +96,15 @@ class BeesdooProduct(models.Model):
                 product.scale_sale_unit = "P"
 
     def _get_main_supplier_info(self):
-        suppliers = self.seller_ids.sorted(
-            key=lambda seller: seller.date_start, reverse=True
-        )
+        far_future = date(3000, 1, 1)
+
+        def sort_date_first(seller):
+            if seller.date_start:
+                return seller.date_start
+            else:
+                return far_future
+
+        suppliers = self.seller_ids.sorted(key=sort_date_first, reverse=True)
         if suppliers:
             return suppliers[0]
         else:

purchase_order_generator/models/product_template.py

@@ -3,6 +3,8 @@
 #   Vincent Van Rossem <vincent@coopiteasy.be>
 # License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).
 
+from datetime import date
+
 from odoo import api, fields, models
 
 
@@ -13,17 +15,20 @@ class ProductTemplate(models.Model):
         "res.partner", compute="_compute_main_supplier_id", store=True
     )
 
-    def _get_sorted_supplierinfo(self):
-        return self.seller_ids.sorted(
-            key=lambda seller: seller.date_start, reverse=True
-        )
-
     @api.multi
     @api.depends("seller_ids", "seller_ids.date_start")
     def _compute_main_supplier_id(self):
+        far_future = date(3000, 1, 1)
+
+        def sort_date_first(seller):
+            if seller.date_start:
+                return seller.date_start
+            else:
+                return far_future
+
         for pt in self:
             sellers_ids = pt.seller_ids.sorted(
-                key=lambda seller: seller.date_start, reverse=True
+                key=sort_date_first, reverse=True
             )
             if sellers_ids:
                 pt.main_supplier_id = sellers_ids[0].name