fix revision access failing when limit is enabled

lib/audited/audit.rb

@@ -78,14 +78,14 @@ def revision
     # Returns a hash of the changed attributes with the new values
     def new_attributes
       (audited_changes || {}).each_with_object({}.with_indifferent_access) do |(attr, values), attrs|
-        attrs[attr] = (action == "update" ? values.last : values)
+        attrs[attr] = (values.is_a?(Array) ? values.last : values)
       end
     end
 
     # Returns a hash of the changed attributes with the old values
     def old_attributes
       (audited_changes || {}).each_with_object({}.with_indifferent_access) do |(attr, values), attrs|
-        attrs[attr] = (action == "update" ? values.first : values)
+        attrs[attr] = (values.is_a?(Array) ? values.first : values)
       end
     end
 

spec/audited/auditor_spec.rb

@@ -555,6 +555,30 @@ def non_column_attr=(val)
       end
     end
 
+    it "should combine field that has never changed" do
+      stub_global_max_audits(2) do
+        user = Models::ActiveRecord::User.create!(name: "Brandon", username: "brandon")
+        user.update!(username: "keepers")
+        user.update!(activated: true)
+        audits = user.audits
+
+        expect(audits.count).to eq(2)
+        expect(audits[0].audited_changes).to include({"name" => "Brandon", "username" => ["brandon", "keepers"]})
+        expect(audits[1].audited_changes).to eq({"activated" => [nil, true]})
+      end
+    end
+
+    it "should be able to access revisions if field never changed" do
+      stub_global_max_audits(2) do
+        user = Models::ActiveRecord::User.create!(name: "Brandon", username: "brandon")
+        user.update!(username: "keepers")
+        user.update!(activated: true)
+        revisions = user.revisions
+
+        expect(revisions[0].attributes).to include({"name" => "Brandon", "username" => "keepers"})
+      end
+    end
+
     it "should add comment line for combined audit" do
       stub_global_max_audits(2) do
         user = Models::ActiveRecord::User.create!(name: "Foobar 1")