feat: agrega rol 'publico' con UserProfile y permisos diferenciados

- Crea modelo UserProfile (OneToOne con User) con user_type: publico/user/administrator
- Señal post_save que crea UserProfile automáticamente al crear User
- UserSerializer.get_role() lee desde profile.user_type
- Nuevos permisos: IsNotPublico, IsPublico y actualiza IsAdministrator
- IsNotPublico restringe acceso a vistas de gestión (productos, clientes, ventas)
- CatalogSaleView.create permite publico; otras acciones requieren IsNotPublico
- UserProfile inline en admin de Usuarios
- Data migration para backfill de usuarios existentes

tienda_ilusion/users/admin.py

@@ -1,3 +1,23 @@
 from django.contrib import admin
+from django.contrib.auth.models import User
+from django.contrib.auth.admin import UserAdmin
 
-# Register your models here.
+from .models import UserProfile
+
+
+class UserProfileInline(admin.StackedInline):
+    model = UserProfile
+    can_delete = False
+
+
+class CustomUserAdmin(UserAdmin):
+    inlines = [UserProfileInline]
+
+    def get_inline_instances(self, request, obj=None):
+        if not obj:
+            return []
+        return super().get_inline_instances(request, obj)
+
+
+admin.site.unregister(User)
+admin.site.register(User, CustomUserAdmin)

tienda_ilusion/users/apps.py

@@ -3,3 +3,6 @@ from django.apps import AppConfig
 
 class UsersConfig(AppConfig):
     name = 'users'
+
+    def ready(self):
+        import users.signals  # noqa

tienda_ilusion/users/migrations/0001_initial.py

@@ -0,0 +1,25 @@
+# Generated by Django 5.0.6 on 2026-06-22 17:26
+
+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='UserProfile',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('user_type', models.CharField(choices=[('publico', 'Público'), ('user', 'Usuario'), ('administrator', 'Administrador')], default='user', max_length=20)),
+                ('user', models.OneToOneField(on_delete=django.db.models.deletion.CASCADE, related_name='profile', to=settings.AUTH_USER_MODEL)),
+            ],
+        ),
+    ]

tienda_ilusion/users/migrations/0002_backfill_user_profiles.py

@@ -0,0 +1,24 @@
+from django.db import migrations
+
+
+def backfill_user_profiles(apps, schema_editor):
+    User = apps.get_model("auth", "User")
+    UserProfile = apps.get_model("users", "UserProfile")
+    for user in User.objects.all():
+        UserProfile.objects.get_or_create(
+            user=user,
+            defaults={
+                "user_type": "administrator" if user.is_staff else "user",
+            },
+        )
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('users', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.RunPython(backfill_user_profiles, migrations.RunPython.noop),
+    ]

tienda_ilusion/users/models.py

@@ -1,3 +1,19 @@
 from django.db import models
+from django.contrib.auth.models import User
 
-# Create your models here.
+
+class UserProfile(models.Model):
+    USER_TYPE_CHOICES = [
+        ("publico", "Público"),
+        ("user", "Usuario"),
+        ("administrator", "Administrador"),
+    ]
+    user = models.OneToOneField(
+        User, on_delete=models.CASCADE, related_name="profile"
+    )
+    user_type = models.CharField(
+        max_length=20, choices=USER_TYPE_CHOICES, default="user"
+    )
+
+    def __str__(self):
+        return f"{self.user.username} - {self.user_type}"

tienda_ilusion/users/serializers.py

@@ -1,13 +1,25 @@
 from django.contrib.auth.models import User
 from rest_framework import serializers
 
+from .models import UserProfile
+
 
 class UserSerializer(serializers.ModelSerializer):
     role = serializers.SerializerMethodField()
 
     class Meta:
         model = User
-        fields = ('id', 'username', 'email', 'first_name', 'last_name', 'role')
+        fields = (
+            "id",
+            "username",
+            "email",
+            "first_name",
+            "last_name",
+            "role",
+        )
 
     def get_role(self, obj):
-        return 'administrator' if obj.is_staff else 'user'
+        try:
+            return obj.profile.user_type
+        except UserProfile.DoesNotExist:
+            return "administrator" if obj.is_staff else "user"

tienda_ilusion/users/signals.py

@@ -0,0 +1,12 @@
+from django.db.models.signals import post_save
+from django.dispatch import receiver
+from django.contrib.auth.models import User
+
+from .models import UserProfile
+
+
+@receiver(post_save, sender=User)
+def create_user_profile(sender, instance, created, **kwargs):
+    if created:
+        user_type = "administrator" if instance.is_staff else "user"
+        UserProfile.objects.create(user=instance, user_type=user_type)

tienda_ilusion/users/tests.py

@@ -4,6 +4,8 @@ from django.contrib.auth.models import User
 from rest_framework.test import APIClient
 from rest_framework_simplejwt.tokens import RefreshToken
 
+from .models import UserProfile
+
 
 class MeEndpointTests(TestCase):
     def setUp(self):
@@ -49,7 +51,6 @@ class MeEndpointTests(TestCase):
             username='regular',
             email='regular@example.com',
             password='regularpass',
-            is_staff=False
         )
 
         refresh = RefreshToken.for_user(regular_user)
@@ -87,6 +88,31 @@ class MeEndpointTests(TestCase):
         self.assertEqual(response.status_code, 200)
         self.assertEqual(response.json()['role'], 'administrator')
 
+    def test_publico_user_role_is_publico(self):
+        """
+        Verifica que un usuario con user_type='publico' recibe role 'publico'.
+        """
+        publico_user = User.objects.create_user(
+            username='publico',
+            email='publico@example.com',
+            password='publicopass',
+        )
+        profile = UserProfile.objects.get(user=publico_user)
+        profile.user_type = 'publico'
+        profile.save()
+
+        refresh = RefreshToken.for_user(publico_user)
+        access_token = str(refresh.access_token)
+
+        client = APIClient()
+        client.credentials(HTTP_AUTHORIZATION=f'Bearer {access_token}')
+
+        url = reverse('current-user')
+        response = client.get(url)
+
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.json()['role'], 'publico')
+
     def test_me_endpoint_requires_authentication(self):
         """
         Sin token el endpoint debe devolver 401 Unauthorized.