Defer instance creation to model

src/servala/core/admin.py

@@ -13,6 +13,7 @@ from servala.core.models import (
     Service,
     ServiceCategory,
     ServiceDefinition,
+    ServiceInstance,
     ServiceOffering,
     ServiceOfferingControlPlane,
     User,
@@ -220,6 +221,41 @@ class ServiceOfferingControlPlaneAdmin(admin.ModelAdmin):
     autocomplete_fields = ("service_offering", "control_plane", "service_definition")
 
 
+@admin.register(ServiceInstance)
+class ServiceInstanceAdmin(admin.ModelAdmin):
+    list_display = ("name", "organization", "context", "created_by", "is_deleted")
+    list_filter = ("organization", "context", "is_deleted")
+    search_fields = (
+        "name",
+        "organization__name",
+        "context__service_offering__service__name",
+    )
+    readonly_fields = ("name", "organization", "context")
+    autocomplete_fields = ("organization", "context")
+
+    def get_readonly_fields(self, request, obj=None):
+        if obj:  # If this is an edit (not a new instance)
+            return self.readonly_fields
+        return []
+
+    fieldsets = (
+        (
+            None,
+            {
+                "fields": (
+                    "name",
+                    "organization",
+                    "context",
+                    "created_by",
+                    "is_deleted",
+                    "deleted_at",
+                    "deleted_by",
+                )
+            },
+        ),
+    )
+
+
 @admin.register(ServiceOffering)
 class ServiceOfferingAdmin(admin.ModelAdmin):
     list_display = ("id", "service", "provider")

src/servala/core/crd.py

@@ -1,10 +1,28 @@
 import re
 
+from django import forms
 from django.core.validators import MaxValueValidator, MinValueValidator, RegexValidator
 from django.db import models
 from django.forms.models import ModelForm, ModelFormMetaclass
 from django.utils.translation import gettext_lazy as _
 
+from servala.core.models import ServiceInstance
+
+
+def duplicate_field(field_name, model):
+    # Get the field from the model
+    field = model._meta.get_field(field_name)
+
+    # Create a new field with the same attributes
+    new_field = type(field).__new__(type(field))
+    new_field.__dict__.update(field.__dict__)
+
+    # Ensure the field is not linked to the original model
+    new_field.model = None
+    new_field.auto_created = False
+
+    return new_field
+
 
 def generate_django_model(schema, group, version, kind):
     """
@@ -14,6 +32,8 @@ def generate_django_model(schema, group, version, kind):
     # defaults = {"apiVersion": f"{group}/{version}", "kind": kind}
 
     model_fields = {"__module__": "crd_models"}
+    for field_name in ("name", "organization", "context"):
+        model_fields[field_name] = duplicate_field(field_name, ServiceInstance)
     model_fields.update(build_object_fields(spec, "spec"))
 
     meta_class = type("Meta", (), {"app_label": "crd_models"})
@@ -110,8 +130,35 @@ def get_django_field(
 class CrdModelFormMixin:
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
-        # self.fields["apiVersion"].disabled = True
-        # self.fields["kind"].disabled = True
+
+        for field in ("organization", "context"):
+            self.fields[field].widget = forms.HiddenInput()
+
+    def get_nested_data(self):
+        """
+        Builds the original nested JSON structure from flat form data.
+        Form fields are named with dot notation (e.g., 'spec.replicas')
+        """
+        result = {}
+
+        for field_name, value in self.cleaned_data.items():
+            if value is None or value == "":
+                continue
+
+            parts = field_name.split(".")
+            current = result
+
+            # Navigate through the nested structure
+            for i, part in enumerate(parts):
+                if i == len(parts) - 1:
+                    # Last part, set the value
+                    current[part] = value
+                else:
+                    # Create nested dict if it doesn't exist
+                    if part not in current:
+                        current[part] = {}
+                    current = current[part]
+        return result
 
 
 def generate_model_form_class(model):

src/servala/core/migrations/0010_service_instance.py

@@ -0,0 +1,117 @@
+# Generated by Django 5.2b1 on 2025-03-28 10:29
+
+import django.core.validators
+import django.db.models.deletion
+import rules.contrib.models
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("core", "0009_organization_namespace"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="organization",
+            name="namespace",
+            field=models.CharField(
+                help_text="This namespace will be used for all Kubernetes resources. Cannot be changed after creation.",
+                max_length=63,
+                unique=True,
+                validators=[
+                    django.core.validators.RegexValidator(
+                        code="invalid_kubernetes_name",
+                        message='Name must consist of lowercase alphanumeric characters or "-", must start and end with an alphanumeric character.',
+                        regex="^[a-z0-9]([-a-z0-9]*[a-z0-9])?$",
+                    )
+                ],
+                verbose_name="Kubernetes Namespace",
+            ),
+        ),
+        migrations.AlterField(
+            model_name="servicecategory",
+            name="name",
+            field=models.CharField(
+                max_length=100,
+                validators=[
+                    django.core.validators.RegexValidator(
+                        code="invalid_kubernetes_name",
+                        message='Name must consist of lowercase alphanumeric characters or "-", must start and end with an alphanumeric character.',
+                        regex="^[a-z0-9]([-a-z0-9]*[a-z0-9])?$",
+                    )
+                ],
+                verbose_name="Name",
+            ),
+        ),
+        migrations.CreateModel(
+            name="ServiceInstance",
+            fields=[
+                (
+                    "id",
+                    models.BigAutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                (
+                    "created_at",
+                    models.DateTimeField(auto_now_add=True, verbose_name="Created"),
+                ),
+                (
+                    "updated_at",
+                    models.DateTimeField(auto_now=True, verbose_name="Last updated"),
+                ),
+                ("name", models.CharField(max_length=100, verbose_name="Name")),
+                ("is_deleted", models.BooleanField(default=False)),
+                ("deleted_at", models.DateTimeField(blank=True, null=True)),
+                (
+                    "context",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.PROTECT,
+                        related_name="service_instances",
+                        to="core.serviceofferingcontrolplane",
+                    ),
+                ),
+                (
+                    "created_by",
+                    models.ForeignKey(
+                        blank=True,
+                        null=True,
+                        on_delete=django.db.models.deletion.SET_NULL,
+                        related_name="+",
+                        to=settings.AUTH_USER_MODEL,
+                    ),
+                ),
+                (
+                    "deleted_by",
+                    models.ForeignKey(
+                        blank=True,
+                        null=True,
+                        on_delete=django.db.models.deletion.SET_NULL,
+                        related_name="+",
+                        to=settings.AUTH_USER_MODEL,
+                    ),
+                ),
+                (
+                    "organization",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.PROTECT,
+                        related_name="service_instances",
+                        to="core.organization",
+                        verbose_name="Organization",
+                    ),
+                ),
+            ],
+            options={
+                "verbose_name": "Service instance",
+                "verbose_name_plural": "Service instances",
+                "unique_together": {("name", "organization", "context")},
+            },
+            bases=(rules.contrib.models.RulesModelMixin, models.Model),
+        ),
+    ]

src/servala/core/migrations/0011_alter_servicecategory_name_and_more.py

@@ -0,0 +1,34 @@
+# Generated by Django 5.2b1 on 2025-03-28 11:51
+
+import django.core.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("core", "0010_service_instance"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="servicecategory",
+            name="name",
+            field=models.CharField(max_length=100, verbose_name="Name"),
+        ),
+        migrations.AlterField(
+            model_name="serviceinstance",
+            name="name",
+            field=models.CharField(
+                max_length=63,
+                validators=[
+                    django.core.validators.RegexValidator(
+                        code="invalid_kubernetes_name",
+                        message='Name must consist of lowercase alphanumeric characters or "-", must start and end with an alphanumeric character.',
+                        regex="^[a-z0-9]([-a-z0-9]*[a-z0-9])?$",
+                    )
+                ],
+                verbose_name="Name",
+            ),
+        ),
+    ]

src/servala/core/models/__init__.py

@@ -12,6 +12,7 @@ from .service import (
     Service,
     ServiceCategory,
     ServiceDefinition,
+    ServiceInstance,
     ServiceOffering,
     ServiceOfferingControlPlane,
 )
@@ -28,6 +29,7 @@ __all__ = [
     "Plan",
     "Service",
     "ServiceCategory",
+    "ServiceInstance",
     "ServiceDefinition",
     "ServiceOffering",
     "ServiceOfferingControlPlane",

src/servala/core/models/organization.py

@@ -49,6 +49,7 @@ class Organization(ServalaModelMixin, models.Model):
         base = "/org/{self.slug}/"
         details = "{base}details/"
         services = "{base}services/"
+        services = "{base}instances/"
 
     @cached_property
     def slug(self):

src/servala/core/models/service.py

@@ -1,4 +1,5 @@
 import kubernetes
+import urlman
 from django.core.cache import cache
 from django.core.exceptions import ValidationError
 from django.db import models
@@ -17,9 +18,7 @@ class ServiceCategory(ServalaModelMixin, models.Model):
     Categories for services, e.g. "Databases", "Storage", "Compute".
     """
 
-    name = models.CharField(
-        max_length=100, verbose_name=_("Name"), validators=[kubernetes_name_validator]
-    )
+    name = models.CharField(max_length=100, verbose_name=_("Name"))
     description = models.TextField(blank=True, verbose_name=_("Description"))
     logo = models.ImageField(
         upload_to="public/service_categories",
@@ -416,7 +415,9 @@ class ServiceInstance(ServalaModelMixin, models.Model):
     on the fly.
     """
 
-    name = models.CharField(max_length=100, verbose_name=_("Name"))
+    name = models.CharField(
+        max_length=63, verbose_name=_("Name"), validators=[kubernetes_name_validator]
+    )
     organization = models.ForeignKey(
         to="core.Organization",
         on_delete=models.PROTECT,
@@ -452,3 +453,16 @@ class ServiceInstance(ServalaModelMixin, models.Model):
         # Names are unique per de-facto namespace, which is defined by the
         # Organization + ServiceDefinition (group, version) + the ControlPlane.
         unique_together = [("name", "organization", "context")]
+
+    class urls(urlman.Urls):
+        base = "{self.organization.urls.instances}{self.name}/"
+
+    @classmethod
+    def create_instance(cls, organization, context, created_by, spec_data):
+        name = spec_data.get("spec.name")
+        return cls.objects.create(
+            name=name,
+            organization=organization,
+            created_by=created_by,
+            context=context,
+        )

src/servala/frontend/forms/service.py

@@ -25,7 +25,9 @@ class ServiceFilterForm(forms.Form):
 
 class ControlPlaneSelectForm(forms.Form):
     control_plane = forms.ModelChoiceField(
-        queryset=ControlPlane.objects.none(), label=_("Service Provider Zone")
+        queryset=ControlPlane.objects.none(),
+        label=_("Service Provider Zone"),
+        empty_label=None,
     )
 
     def __init__(self, *args, planes=None, **kwargs):

src/servala/frontend/views/service.py

@@ -1,7 +1,14 @@
+from django.contrib import messages
+from django.shortcuts import redirect
 from django.utils.functional import cached_property
 from django.views.generic import DetailView, ListView
 
-from servala.core.models import Service, ServiceOffering, ServiceOfferingControlPlane
+from servala.core.models import (
+    Service,
+    ServiceInstance,
+    ServiceOffering,
+    ServiceOfferingControlPlane,
+)
 from servala.frontend.forms.service import ControlPlaneSelectForm, ServiceFilterForm
 from servala.frontend.views.mixins import HtmxViewMixin, OrganizationViewMixin
 
@@ -68,26 +75,67 @@ class ServiceOfferingDetailView(OrganizationViewMixin, HtmxViewMixin, DetailView
         data = None
         if "control_plane" in self.request.GET:
             data = self.request.GET
+        elif self.request.method == "POST" and self.context_object:
+            data = {"control_plane": self.context_object.control_plane_id}
         return ControlPlaneSelectForm(data=data, planes=self.planes)
 
+    @cached_property
+    def selected_plane(self):
+        if self.select_form.data and self.select_form.is_valid():
+            return self.select_form.cleaned_data["control_plane"]
+        field = self.select_form.fields["control_plane"]
+        return field.initial or field.queryset.first()
+
+    @cached_property
+    def context_object(self):
+        if self.request.method == "POST":
+            return ServiceOfferingControlPlane.objects.filter(
+                pk=self.request.POST.get("context"),
+                # Make sure we don’t use a malicious ID
+                control_plane__in=self.planes,
+            ).first()
+        return ServiceOfferingControlPlane.objects.filter(
+            control_plane=self.selected_plane, service_offering=self.object
+        ).first()
+
+    def get_instance_form(self):
+        return self.context_object.model_form_class(
+            data=self.request.POST if self.request.method == "POST" else None,
+            initial={
+                "organization": self.request.organization,
+                "context": self.context_object,
+            },
+        )
+
     def get_context_data(self, **kwargs):
         context = super().get_context_data(**kwargs)
         context["select_form"] = self.select_form
         context["has_control_planes"] = self.planes.exists()
-        if "control_plane" in self.request.GET:
-            if self.select_form.is_valid():
-                context["selected_plane"] = self.select_form.cleaned_data[
-                    "control_plane"
-                ]
-                try:
-                    so_cp = ServiceOfferingControlPlane.objects.filter(
-                        control_plane=self.select_form.cleaned_data["control_plane"],
-                        service_offering=self.object,
-                    ).first()
-                    if not so_cp:
-                        context["form_error"] = True
-                except Exception:
-                    context["form_error"] = True
-                else:
-                    context["service_form"] = so_cp.model_form_class()
+        context["selected_plane"] = self.selected_plane
+        context["service_form"] = self.get_instance_form()
         return context
+
+    def post(self, request, *args, **kwargs):
+        self.object = self.get_object()
+        context = self.get_context_data(object=self.object)
+
+        if not self.context_object:
+            context["form_error"] = True
+            return self.render_to_response(context)
+
+        form = self.get_instance_form()
+        if form.is_valid():
+            try:
+                service_instance = ServiceInstance.create_instance(
+                    organization=self.organization,
+                    context=self.context_object,
+                    created_by=request.user,
+                    spec_data=form.get_nested_data(),
+                )
+                return redirect(service_instance.urls.base)
+            except Exception as e:
+                messages.error(self.request, str(e))
+
+        # If the form is not valid or if the service creation failed, we render it again
+        context["service_form"] = form
+        return self.render_to_response(context)