[FIX] website_event_sale: pricelist discount product qty

Before this commit, a pricelist discount based on the product qty could
be created and the user may believe that it will work also for event
tickets.

Now: when configuring a pricelist discount based on the product qty a
warning message is show to alert that this kind of discount don't work
in event tickets.

opw-1940368

closes odoo/odoo#31459

Signed-off-by: "Lucas Perais (lpe)" <lpe@odoo.com>

addons/website_event_sale/i18n/website_event_sale.pot

@@ -30,6 +30,18 @@ msgstr ""
 msgid "<span>left</span>"
 msgstr ""
 
+#. module: website_event_sale
+#: code:addons/website_event_sale/models/product_pricelist.py:16
+#, python-format
+msgid "A pricelist item with a positive min. quantity cannot be applied to this event tickets product."
+msgstr ""
+
+#. module: website_event_sale
+#: code:addons/website_event_sale/models/product_pricelist.py:13
+#, python-format
+msgid "A pricelist item with a positive min. quantity will not be applied to the event tickets products."
+msgstr ""
+
 #. module: website_event_sale
 #: model:ir.ui.view,arch_db:website_event_sale.index
 msgid "Only"
@@ -79,6 +91,12 @@ msgstr ""
 msgid "The ticket doesn't match with this product."
 msgstr ""
 
+#. module: website_event_sale
+#: code:addons/website_event_sale/models/product_pricelist.py:20
+#, python-format
+msgid "Warning"
+msgstr ""
+
 #. module: website_event_sale
 #: model:ir.model,name:website_event_sale.model_website
 msgid "Website"

addons/website_event_sale/models/__init__.py

@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 
 from . import product
+from . import product_pricelist
 from . import sale_order
 from . import website

addons/website_event_sale/models/product_pricelist.py

@@ -0,0 +1,23 @@
+# -*- coding: utf-8 -*-
+
+from odoo import _, api, models
+
+class PricelistItem(models.Model):
+    _inherit = "product.pricelist.item"
+
+    @api.onchange('applied_on', 'product_id', 'product_tmpl_id', 'min_quantity')
+    def _onchange_event_sale_warning(self):
+        if self.min_quantity > 0:
+            msg = ''
+            if self.applied_on == '3_global' or self.applied_on == '2_product_category':
+                msg = _("A pricelist item with a positive min. quantity will not be applied to the event tickets products.")
+            elif ((self.applied_on == '1_product' and self.product_tmpl_id.event_ok) or
+                    (self.applied_on == '0_product_variant' and self.product_id.event_ok)):
+                msg = _("A pricelist item with a positive min. quantity cannot be applied to this event tickets product.")
+            if msg:
+                return {'warning':
+                    {
+                        'title': _("Warning"),
+                        'message': msg
+                    }
+                }