Improve name uniqueness feedback

src/servala/core/models/service.py

@@ -3,7 +3,7 @@ import urlman
 from django.conf import settings
 from django.core.cache import cache
 from django.core.exceptions import ValidationError
-from django.db import models
+from django.db import IntegrityError, models
 from django.utils.functional import cached_property
 from django.utils.translation import gettext_lazy as _
 from encrypted_fields.fields import EncryptedJSONField
@@ -492,6 +492,19 @@ class ServiceInstance(ServalaModelMixin, models.Model):
     def create_instance(cls, name, organization, context, created_by, spec_data):
         # Ensure the namespace exists
         context.control_plane.get_or_create_namespace(organization.namespace)
+        try:
+            instance = cls.objects.create(
+                name=name,
+                organization=organization,
+                created_by=created_by,
+                context=context,
+            )
+        except IntegrityError:
+            raise ValidationError(
+                _(
+                    "An instance with this name already exists in this organization. Please choose a different name."
+                )
+            )
 
         group = context.service_definition.api_definition["group"]
         version = context.service_definition.api_definition["version"]
@@ -521,10 +534,4 @@ class ServiceInstance(ServalaModelMixin, models.Model):
             plural=plural,
             body=create_data,
         )
-
-        return cls.objects.create(
-            name=name,
-            organization=organization,
-            created_by=created_by,
-            context=context,
-        )
+        return instance

src/servala/frontend/views/service.py

@@ -135,7 +135,8 @@ class ServiceOfferingDetailView(OrganizationViewMixin, HtmxViewMixin, DetailView
                 )
                 return redirect(service_instance.urls.base)
             except Exception as e:
-                messages.error(self.request, str(e))
+                error_message = getattr(e, "message", None) or str(e)
+                messages.error(self.request, error_message)
 
         # If the form is not valid or if the service creation failed, we render it again
         context["service_form"] = form