Add Activity#roda_identifier

This method lets you get the RODA identifier for an activity while
hiding the implementation details of the `roda_identifier_fragment` and
`roda_identifier_compound` fields. It returns the "compound" identifier,
i.e. the cached ID formed by concatenating the fragments of all the
ancestor activities.

app/models/activity.rb

@@ -179,6 +179,10 @@ def child_level
     end
   end
 
+  def roda_identifier
+    roda_identifier_compound
+  end
+
   def can_set_roda_identifier?
     identifier_fragments = roda_identifier_fragment_chain
     identifier_fragments[0..-2].all?(&:present?) && identifier_fragments.last.blank?

db/seeds/activity.rb

@@ -12,7 +12,7 @@
 
 _newton_fund = Activity.find_or_create_by(newton_fund_params)
 
-delivery_partner = Organisation.find_by!(service_owner: false)
+delivery_partner = User.all.find(&:delivery_partner?).organisation
 
 first_programme_params = FactoryBot.build(:programme_activity,
   title: "International Partnerships",
@@ -37,3 +37,8 @@
   extending_organisation: delivery_partner).attributes
 
 Activity.find_or_create_by(project_params)
+
+Activity.all.each do |activity|
+  activity.cache_roda_identifier!
+  activity.save!
+end

spec/models/activity_spec.rb

@@ -1012,6 +1012,16 @@
     end
   end
 
+  describe "#roda_identifier" do
+    let(:fund) { create(:fund_activity, roda_identifier_fragment: "GCRF") }
+    let(:programme) { create(:programme_activity, parent: fund, roda_identifier_fragment: "RSDel") }
+    let(:project) { create(:project_activity, parent: programme, roda_identifier_fragment: "DEL_Misc") }
+
+    it "returns the compound RODA identifier" do
+      expect(project.roda_identifier).to eq("GCRF-RSDel-DEL_Misc")
+    end
+  end
+
   describe "#actual_total_for_report_financial_quarter" do
     it "returns the total of all the activity's transactions scoped to a report" do
       project = create(:project_activity, :with_report)