feat: implement backend operation bypass for location restrictions and add diagnostic logging to stock quant creation

models/stock_location.py

@@ -66,16 +66,45 @@ class StockQuant(models.Model):
                 if picking_type.exists() and picking_type.default_location_src_ids:
                     allowed_location_ids = picking_type.default_location_src_ids.ids
                     
+        # 7. NEW: Detect Backend Operations (Force Bypass)
+        # If we are in a background synchronization or an ORM command (not triggered by UI search)
+        # return empty so we do not restrict.
+        is_ui_search = (ctx.get('params') or 
+                        ctx.get('bin_size') or 
+                        ctx.get('search_view_ref') or 
+                        ctx.get('list_view_ref'))
+        
+        # If it's NOT a UI search (i.e. it's a Save, Post, Validate background call), bypass.
+        if not is_ui_search:
+            # Check for common background flags
+            if (ctx.get('mail_create_nolog') or 
+                ctx.get('tracking_disable') or 
+                not ctx.get('uid')): # System user
+                return []
+                    
         return allowed_location_ids
 
+    @api.model_create_multi
+    def create(self, vals_list):
+        """Diagnostic override to catch the 'Missing Product' error root cause"""
+        for vals in vals_list:
+            if not vals.get('product_id'):
+                # LOG THE CALLER for debugging
+                _logger.error("DEBUG_RESTRICT: Creating StockQuant WITHOUT product_id!")
+                _logger.error(f"DEBUG_RESTRICT: Vals: {vals}")
+                _logger.error(f"DEBUG_RESTRICT: Context: {self.env.context}")
+                # We do NOT raise here to avoid breaking Odoo's original error UX, 
+                # but this will appear in logs or help us see the issue.
+        return super().create(vals_list)
+
     @api.model
     def _get_gather_domain(self, product_id, location_id, lot_id=None, package_id=None, owner_id=None, strict=False):
         """Override to apply location restrictions during reservation (gather)"""
         result_domain = super()._get_gather_domain(product_id, location_id, lot_id, package_id, owner_id, strict)
         
         ctx = self.env.context
-        # 0. Bypass if skip flag is set
+        # 0. Bypass if skip flag is set OR we are in a system operation
-        if ctx.get('skip_location_restriction'):
+        if ctx.get('skip_location_restriction') or not ctx.get('uid'):
             return result_domain
 
         # 1. FIX: If reserving from a non-internal location, DO NOT apply internal restrictions.
@@ -107,9 +136,11 @@ class StockQuant(models.Model):
     def _search(self, domain, offset=0, limit=None, order=None, *args, **kwargs):
         """Override to apply location restrictions during search (e.g. catalog or list selection)"""
         ctx = self.env.context
-        # 0. CRITICAL FIX: If searching for specific IDs or skip flag set, bypass custom filtering
+        # 0. CRITICAL FIX: If searching for specific IDs OR skip flag set OR NOT UI Search, bypass custom filtering
         search_by_id = any(isinstance(leaf, (list, tuple)) and leaf[0] == 'id' for leaf in domain)
-        if search_by_id or ctx.get('skip_location_restriction'):
+        is_ui_search = ctx.get('params') or ctx.get('search_view_ref') or ctx.get('list_view_ref')
+        
+        if search_by_id or ctx.get('skip_location_restriction') or not is_ui_search:
             return super()._search(domain, offset=offset, limit=limit, order=order, *args, **kwargs)
 
         allowed_location_ids = self._get_allowed_locations()
@@ -158,9 +189,12 @@ class StockLot(models.Model):
     def _search(self, domain, offset=0, limit=None, order=None, *args, **kwargs):
         ctx = self.env.context
         
-        # FIX: If we are searching for specific IDs, bypass custom filtering to avoid backend failures
+        # 0. NEW: Detect UI Search vs Backend Sync
         search_by_id = any(isinstance(leaf, (list, tuple)) and leaf[0] == 'id' for leaf in domain)
-        if search_by_id or ctx.get('skip_location_restriction'):
+        is_ui_search = ctx.get('params') or ctx.get('search_view_ref') or ctx.get('list_view_ref')
+
+        # FIX: If we are searching for specific IDs OR skip flag set OR NOT UI search, bypass
+        if search_by_id or ctx.get('skip_location_restriction') or not is_ui_search:
             return super()._search(domain, offset=offset, limit=limit, order=order, *args, **kwargs)
 
         # 1. Identify which locations we should look into for quants
@@ -183,6 +217,7 @@ class StockLot(models.Model):
                 quant_domain.append(('product_id', '=', product_id))
             
             # Use internal bypass when searching quants to filter lots
+            # We use sudo() and skip_location_restriction to ensure we always find the quants
             quants = self.env['stock.quant'].with_context(skip_location_restriction=True).sudo().search(quant_domain)
             lot_ids = list(set(quants.mapped('lot_id').ids))