Have form handler class decide the current form

app/models/form_handler.rb

@@ -10,6 +10,10 @@ class FormHandler
     @forms[form]
   end
 
+  def current_form
+    forms[forms.keys.sort { |a, b| a.to_i <=> b.to_i }.last]
+  end
+
 private
 
   def get_all_forms

app/models/local_authority.rb

@@ -1,5 +1,5 @@
 class LocalAuthority
   def self.ons_code_mappings
-    FormHandler.instance.forms["2021_2022"].get_question("la", nil).answer_options
+    FormHandler.instance.current_form.get_question("la", nil).answer_options
   end
 end

spec/models/form_handler_spec.rb

@@ -21,6 +21,15 @@ RSpec.describe FormHandler do
     end
   end
 
+  describe "Current form" do
+    it "returns the latest form by date" do
+      form_handler = described_class.instance
+      form = form_handler.current_form
+      expect(form).to be_a(Form)
+      expect(form.start_date.year).to eq(2022)
+    end
+  end
+
   it "loads the form once at boot time" do
     form_handler = described_class.instance
     expect(Form).not_to receive(:new).with(:any, test_form_name)

spec/models/local_authority_spec.rb

@@ -2,6 +2,11 @@ require "rails_helper"
 
 RSpec.describe LocalAuthority, type: :model do
   describe "ons code mapping" do
+    let(:form) { Form.new("spec/fixtures/forms/2021_2022.json", "2021_2022") }
+    before do
+      allow(FormHandler.instance).to receive(:current_form).and_return(form)
+    end
+
     it "maps ONS code to local authority names" do
       expect(described_class.ons_code_mappings).to be_a(Hash)
       expect(described_class.ons_code_mappings["E07000178"]).to eq("Oxford")