adds geozone helper to map ids and names

app/helpers/geozones_helper.rb

@@ -8,4 +8,9 @@ module GeozonesHelper
     Geozone.all.order(name: :asc).collect { |g| [ g.name, g.id ] }
   end
 
+  def geozone_name_from_id(g_id)
+    @all_geozones ||= Geozone.all.collect{ |g| [ g.id, g.name ] }.to_h
+    @all_geozones[g_id] || t("geozones.none")
+  end
+
 end

spec/helpers/geozones_helper_spec.rb

@@ -31,4 +31,19 @@ describe GeozonesHelper do
     end
   end
 
+  describe "#geozone_name_from_id" do
+
+    it "returns geozone name if present" do
+      g1 = create(:geozone, name: "AAA")
+      g2 = create(:geozone, name: "BBB")
+
+      expect(geozone_name_from_id(g1.id)).to eq "AAA"
+      expect(geozone_name_from_id(g2.id)).to eq "BBB"
+    end
+
+    it "returns default string for no geozone if geozone is blank" do
+      expect(geozone_name_from_id(nil)).to eq "All city"
+    end
+  end
+
 end