Exception handling (#5622)

* get_setting_object: Handle ProgrammingError

* Improved exception handling

- Address a few cases on application startup if the database is not ready (migrations not applied)

InvenTree/InvenTree/apps.py

@@ -71,7 +71,10 @@ class InvenTreeConfig(AppConfig):
             return
 
         # Remove any existing obsolete tasks
-        Schedule.objects.filter(func__in=obsolete).delete()
+        try:
+            Schedule.objects.filter(func__in=obsolete).delete()
+        except Exception:
+            logger.error("Failed to remove obsolete tasks - database not ready")
 
     def start_background_tasks(self):
         """Start all background tests for InvenTree."""

InvenTree/common/models.py

@@ -31,7 +31,7 @@ from django.core.validators import (MaxValueValidator, MinValueValidator,
                                     URLValidator)
 from django.db import models, transaction
 from django.db.models.signals import post_delete, post_save
-from django.db.utils import IntegrityError, OperationalError
+from django.db.utils import IntegrityError, OperationalError, ProgrammingError
 from django.dispatch.dispatcher import receiver
 from django.urls import reverse
 from django.utils.timezone import now
@@ -487,7 +487,7 @@ class BaseInvenTreeSetting(models.Model):
             setting = settings.filter(**filters).first()
         except (ValueError, cls.DoesNotExist):
             setting = None
-        except (IntegrityError, OperationalError):
+        except (IntegrityError, OperationalError, ProgrammingError):
             setting = None
 
         # Setting does not exist! (Try to create it)
@@ -512,7 +512,7 @@ class BaseInvenTreeSetting(models.Model):
                     # Wrap this statement in "atomic", so it can be rolled back if it fails
                     with transaction.atomic():
                         setting.save(**kwargs)
-                except (IntegrityError, OperationalError):
+                except (IntegrityError, OperationalError, ProgrammingError):
                     # It might be the case that the database isn't created yet
                     pass
                 except ValidationError:

InvenTree/label/apps.py

@@ -182,8 +182,11 @@ class LabelConfig(AppConfig):
             shutil.copyfile(src_file, dst_file)
 
         # Check if a label matching the template already exists
-        if model.objects.filter(label=filename).exists():
-            return  # pragma: no cover
+        try:
+            if model.objects.filter(label=filename).exists():
+                return  # pragma: no cover
+        except Exception:
+            logger.error(f"Failed to query label for '{filename}' - you should run 'invoke update' first!")
 
         logger.info(f"Creating entry for {model} '{label['name']}'")
 

InvenTree/part/apps.py

@@ -55,12 +55,15 @@ class PartConfig(AppConfig):
         if isImportingData():
             return
 
-        items = PartPricing.objects.filter(scheduled_for_update=True)
+        try:
+            items = PartPricing.objects.filter(scheduled_for_update=True)
 
-        if items.count() > 0:
-            # Find any pricing objects which have the 'scheduled_for_update' flag set
-            print(f"Resetting update flags for {items.count()} pricing objects...")
+            if items.count() > 0:
+                # Find any pricing objects which have the 'scheduled_for_update' flag set
+                logger.info(f"Resetting update flags for {items.count()} pricing objects...")
 
-            for pricing in items:
-                pricing.scheduled_for_update = False
-                pricing.save()
+                for pricing in items:
+                    pricing.scheduled_for_update = False
+                    pricing.save()
+        except Exception:
+            logger.error("Failed to reset pricing flags - database not ready")