Allow service owner to be identified by both IDs

To facilitate the transition between the service owner being identified
by the old IATI reference `GB-GOV-13` and being identified by the new
IATI reference `GB-GOV-26`, allow both identifiers to be used.

This will prevent user permissions from being lost during the short
interval between the code being deployed and the migration being run.

CHANGELOG.md

@@ -7,6 +7,7 @@
 - Exclude health check requests from host authorisation
 - Remove the feature flag for ODA bulk upload
 - Change the transparency identifier and names for the DSIT organisations (DSIT and DSIT Finance)
+- Allow service owner to be identified by both IDs during the transition between BEIS and DSIT
 
 ## Release 142 - 2024-01-16
 

app/models/organisation.rb

@@ -101,6 +101,6 @@ def is_reporter?
   end
 
   def self.service_owner
-    find_by(iati_reference: SERVICE_OWNER_IATI_REFERENCE)
+    find_by(iati_reference: ["GB-GOV-13", "GB-GOV-26"])
   end
 end

spec/models/organisation_spec.rb

@@ -205,9 +205,26 @@
 
   describe ".service_owner" do
     let!(:service_owner) { create(:beis_organisation) }
+
     it "returns the service owner" do
       expect(Organisation.service_owner).to eq(service_owner)
     end
+
+    context "when the organisation's iati_reference is 'GB-GOV-13'" do
+      before { service_owner.update(iati_reference: "GB-GOV-13") }
+
+      it "identifies it as the service owner" do
+        expect(Organisation.service_owner).to eq(service_owner)
+      end
+    end
+
+    context "when the organisation's iati_reference is 'GB-GOV-26'" do
+      before { service_owner.update(iati_reference: "GB-GOV-26") }
+
+      it "identifies it as the service owner" do
+        expect(Organisation.service_owner).to eq(service_owner)
+      end
+    end
   end
 
   describe ".sorted_by_name" do