[FIX] fieldservice: Fixed expected singleton on mass edit

Author: BernatObrador

fieldservice/models/fsm_order.py

@@ -260,13 +260,14 @@ def create(self, vals):
     is_button = fields.Boolean(default=False)
 
     def write(self, vals):
-        if vals.get("stage_id", False) and vals.get("is_button", False):
-            vals["is_button"] = False
-        else:
-            stage_id = self.env["fsm.stage"].browse(vals.get("stage_id"))
-            if stage_id == self.env.ref("fieldservice.fsm_stage_completed"):
-                raise UserError(_("Cannot move to completed from Kanban"))
-        self._calc_scheduled_dates(vals)
+        for record in self:
+            if vals.get("stage_id", False) and vals.get("is_button", False):
+                vals["is_button"] = False
+            else:
+                stage_id = self.env["fsm.stage"].browse(vals.get("stage_id"))
+                if stage_id == self.env.ref("fieldservice.fsm_stage_completed"):
+                    raise UserError(_("Cannot move to completed from Kanban"))
+            record._calc_scheduled_dates(vals)
         res = super().write(vals)
         return res