chore: define an initial 'INIT group' model

Author: jgravois

benefits/enrollment_init/admin.py

@@ -7,3 +7,8 @@
 @admin.register(models.InitConfig)
 class InitConfigAdmin(StaffPermissionMixin, admin.ModelAdmin):
     pass
+
+
+@admin.register(models.InitGroup)
+class InitGroupAdmin(StaffPermissionMixin, admin.ModelAdmin):
+    pass

benefits/enrollment_init/migrations/0002_initgroup.py

@@ -0,0 +1,41 @@
+# Generated by Django 5.2.17 on 2026-09-08 16:05
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("core", "0008_alter_enrollmentflow_system_name"),
+        ("enrollment_init", "0001_initial"),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="InitGroup",
+            fields=[
+                (
+                    "enrollmentgroup_ptr",
+                    models.OneToOneField(
+                        auto_created=True,
+                        on_delete=django.db.models.deletion.CASCADE,
+                        parent_link=True,
+                        primary_key=True,
+                        serialize=False,
+                        to="core.enrollmentgroup",
+                    ),
+                ),
+                (
+                    "group_id",
+                    models.IntegerField(
+                        blank=True, default=None, help_text="The ID of the INIT FareCategory for user enrollment."
+                    ),
+                ),
+            ],
+            options={
+                "verbose_name": "INIT group",
+            },
+            bases=("core.enrollmentgroup",),
+        ),
+    ]

benefits/enrollment_init/models.py

@@ -1,7 +1,11 @@
+import logging
+
 from django.core.exceptions import ValidationError
 from django.db import models
 
-from benefits.core.models import SecretNameField, TransitProcessorConfig
+from benefits.core.models import EnrollmentGroup, SecretNameField, TransitProcessorConfig
+
+logger = logging.getLogger(__name__)
 
 
 class InitConfig(TransitProcessorConfig):
@@ -48,3 +52,16 @@ def clean(self):
 
     class Meta:
         verbose_name = "INIT config"
+
+
+class InitGroup(EnrollmentGroup):
+    group_id = models.IntegerField(default=None, blank=True, help_text="The ID of the INIT FareCategory for user enrollment.")
+
+    @staticmethod
+    def by_id(id):
+        """Get an INIT FareCategory instance by its ID."""
+        logger.debug(f"Get {InitGroup.__name__} by id: {id}")
+        return InitGroup.objects.get(id=id)
+
+    class Meta:
+        verbose_name = "INIT group"