refactor: change owning_organisation_id: organisation.id to owning_organisation: organisation

spec/models/scheme_spec.rb

@@ -217,7 +217,7 @@ RSpec.describe Scheme, type: :model do
 
     context "when the owning organisation is set as a non-stock-owning organisation" do
       it "throws the correct validation error" do
-        expect { scheme.update!({ owning_organisation_id: non_stock_owning_org.id }) }.to raise_error(ActiveRecord::RecordInvalid, /Enter an organisation that owns housing stock/)
+        expect { scheme.update!({ owning_organisation: non_stock_owning_org }) }.to raise_error(ActiveRecord::RecordInvalid, /Enter an organisation that owns housing stock/)
       end
     end
   end

spec/requests/schemes_controller_spec.rb

@@ -494,7 +494,7 @@ RSpec.describe SchemesController, type: :request do
         let(:organisation) { FactoryBot.create(:organisation) }
         let(:params) do
           { scheme: {
-            owning_organisation_id: organisation.id,
+            owning_organisation: organisation,
           } }
         end