Improve error on viewing remotely-deleted instance

src/servala/frontend/urls.py

@@ -50,6 +50,11 @@ urlpatterns = [
                     views.ServiceInstanceDetailView.as_view(),
                     name="organization.instance",
                 ),
+                path(
+                    "instances/<slug:slug>/update/",
+                    views.ServiceInstanceUpdateView.as_view(),
+                    name="organization.instance.update",
+                ),
             ]
         ),
     ),

src/servala/frontend/views/__init__.py

@@ -9,6 +9,7 @@ from .service import (
     ServiceDetailView,
     ServiceInstanceDetailView,
     ServiceInstanceListView,
+    ServiceInstanceUpdateView,
     ServiceListView,
     ServiceOfferingDetailView,
 )
@@ -22,6 +23,7 @@ __all__ = [
     "ServiceDetailView",
     "ServiceInstanceDetailView",
     "ServiceInstanceListView",
+    "ServiceInstanceUpdateView",
     "ServiceListView",
     "ServiceOfferingDetailView",
     "ProfileView",

src/servala/frontend/views/service.py

@@ -2,6 +2,7 @@ from django.contrib import messages
 from django.core.exceptions import ValidationError
 from django.shortcuts import redirect
 from django.utils.functional import cached_property
+from django.utils.translation import gettext_lazy as _
 from django.views.generic import DetailView, ListView
 
 from servala.core.crd import deslugify
@@ -105,6 +106,8 @@ class ServiceOfferingDetailView(OrganizationViewMixin, HtmxViewMixin, DetailView
         ).first()
 
     def get_instance_form(self):
+        if not self.context_object:
+            return None
         return self.context_object.model_form_class(
             data=self.request.POST if self.request.method == "POST" else None,
             initial={
@@ -130,6 +133,10 @@ class ServiceOfferingDetailView(OrganizationViewMixin, HtmxViewMixin, DetailView
             return self.render_to_response(context)
 
         form = self.get_instance_form()
+        if not form:  # Should not happen if context_object is valid, but as a safeguard
+            messages.error(self.request, _("Could not initialize service form."))
+            return self.render_to_response(context)
+
         if form.is_valid():
             try:
                 service_instance = ServiceInstance.create_instance(
@@ -143,7 +150,9 @@ class ServiceOfferingDetailView(OrganizationViewMixin, HtmxViewMixin, DetailView
             except ValidationError as e:
                 messages.error(self.request, e.message or str(e))
             except Exception as e:
-                messages.error(self.request, str(e))
+                messages.error(
+                    self.request, _("Error creating instance: {}").format(str(e))
+                )
 
         # If the form is not valid or if the service creation failed, we render it again
         context["service_form"] = form