✅(tests) fix tests after adding slugs to domains

- slug readonly on admin
- fix test to expect slug in payload, when retrieving a domain

src/backend/mailbox_manager/admin.py

@@ -14,9 +14,10 @@ class MailDomainAdmin(admin.ModelAdmin):
         "name",
         "created_at",
         "updated_at",
+        "slug",
     )
     search_fields = ("name",)
-    readonly_fields = ["created_at"]
+    readonly_fields = ["created_at", "slug"]
 
 
 @admin.register(models.MailDomainAccess)

src/backend/mailbox_manager/api/serializers.py

@@ -26,6 +26,12 @@ class MailDomainSerializer(serializers.ModelSerializer):
             "created_at",
             "updated_at",
         ]
+        read_only_fields = [
+            "id",
+            "slug",
+            "created_at",
+            "updated_at",
+        ]
 
 
 class MailDomainAccessSerializer(serializers.ModelSerializer):

src/backend/mailbox_manager/models.py

@@ -28,10 +28,14 @@ class MailDomain(BaseModel):
         return self.name
 
     def save(self, *args, **kwargs):
-        if not self.slug:
-            self.slug = slugify(self.name)
+        """Override save function to compute the slug."""
+        self.slug = self.get_slug()
         return super().save(*args, **kwargs)
 
+    def get_slug(self):
+        """Compute slug value from name."""
+        return slugify(self.name)
+
     def get_abilities(self, user):
         """
         Compute and return abilities for a given user on the domain.

src/backend/mailbox_manager/tests/api/mail_domain/test_api_mail_domains_retrieve.py

@@ -66,6 +66,7 @@ def test_api_mail_domains__retrieve_authenticated_related():
     assert response.json() == {
         "id": str(domain.id),
         "name": domain.name,
+        "slug": domain.slug,
         "created_at": domain.created_at.isoformat().replace("+00:00", "Z"),
         "updated_at": domain.updated_at.isoformat().replace("+00:00", "Z"),
     }

src/backend/mailbox_manager/tests/test_models_maildomain.py

@@ -3,6 +3,7 @@ Unit tests for the MailDomain model
 """
 
 from django.core.exceptions import ValidationError
+from django.utils.text import slugify
 
 import pytest
 
@@ -10,7 +11,6 @@ from mailbox_manager import factories
 
 pytestmark = pytest.mark.django_db
 
-
 # NAME FIELD
 
 
@@ -24,3 +24,11 @@ def test_models_mail_domain__domain_name_should_not_be_null():
     """The domain name field should not be null."""
     with pytest.raises(ValidationError, match="This field cannot be null."):
         factories.MailDomainFactory(name=None)
+
+
+def test_models_mail_domain__slug_inferred_from_name():
+    """Passed slug is ignored. Slug is automatically generated from name."""
+
+    name = "N3w_D0main-Name$.com"
+    domain = factories.MailDomainFactory(name=name, slug="something else")
+    assert domain.slug == slugify(name)