[FIX] point_of_sale: pos_config write should be @multi compliant

Avoid "expected singleton" when writing on multiple pos_config

closes #24953

1 files changed, 5 insertions, 4 deletions

diff --git a/addons/point_of_sale/models/pos_config.py b/addons/point_of_sale/models/pos_config.py
index db88b7c6638..efca9a08428 100644
--- a/addons/point_of_sale/models/pos_config.py
+++ b/addons/point_of_sale/models/pos_config.py
@@ -351,11 +351,12 @@ class PosConfig(models.Model):
 
     @api.multi
     def write(self, vals):
-        if (self.is_posbox or vals.get('is_posbox')) and (self.iface_customer_facing_display or vals.get('iface_customer_facing_display')):
-            facing_display = (self.customer_facing_display_html or vals.get('customer_facing_display_html') or '').strip()
-            if not facing_display:
-                vals['customer_facing_display_html'] = self._compute_default_customer_html()
         result = super(PosConfig, self).write(vals)
+
+        config_display = self.filtered(lambda c: c.is_posbox and c.iface_customer_facing_display and not (c.customer_facing_display_html or '').strip())
+        if config_display:
+            super(PosConfig, config_display).write({'customer_facing_display_html': self._compute_default_customer_html()})
+
         self.sudo()._set_fiscal_position()
         self.sudo()._check_modules_to_install()
         self.sudo()._check_groups_implied()