fix: Force environments to be different names

api/environments/serializers.py

@@ -111,6 +111,15 @@ class CreateUpdateEnvironmentSerializer(
     invalid_plans = ("free",)
     field_names = ("minimum_change_request_approvals",)
 
+    class Meta(EnvironmentSerializerWithMetadata.Meta):
+        validators = [
+            serializers.UniqueTogetherValidator(
+                queryset=EnvironmentSerializerWithMetadata.Meta.model.objects.all(),
+                fields=("name", "project"),
+                message="An environment with this name already exists.",
+            )
+        ]
+
     def get_subscription(self) -> typing.Optional[Subscription]:
         view = self.context["view"]
 

api/tests/unit/environments/test_unit_environments_views.py

@@ -588,6 +588,33 @@ def test_should_create_environments(
         ).exists()
 
 
+def test_environment_matches_existing_environment_name(
+    project: Project,
+    admin_client: APIClient,
+) -> None:
+    # Given
+    url = reverse("api-v1:environments:environment-list")
+    description = "This is the description"
+    name = "Test environment"
+    data = {
+        "name": name,
+        "project": project.id,
+        "description": description,
+    }
+    Environment.objects.create(name=name, description=description, project=project)
+
+    # When
+    response = admin_client.post(
+        url, data=json.dumps(data), content_type="application/json"
+    )
+
+    # Then
+    assert response.status_code == 400
+    assert response.json() == {
+        "non_field_errors": ["An environment with this name already exists."]
+    }
+
+
 def test_create_environment_without_required_metadata_returns_400(
     project,
     admin_client_new,