Make helper methods private

Otherwise next dev might think these are attributes of the resulting
JSON serialized object.

They just made the refactoring a bit easier.

app/serializers/api/cached_enterprise_serializer.rb

@@ -74,14 +74,6 @@ class Api::CachedEnterpriseSerializer < ActiveModel::Serializer
     ids_to_objs options[:data].supplied_taxons[object.id]
   end
 
-  def product_properties
-    enterprise.supplied_products.flat_map(&:properties)
-  end
-
-  def producer_properties
-    enterprise.properties
-  end
-
   def supplied_properties
     (product_properties + producer_properties).uniq do |property_object|
       property_object.property.presentation
@@ -149,6 +141,14 @@ class Api::CachedEnterpriseSerializer < ActiveModel::Serializer
 
   private
 
+  def product_properties
+    enterprise.supplied_products.flat_map(&:properties)
+  end
+
+  def producer_properties
+    enterprise.properties
+  end
+
   def enterprise
     object
   end

spec/serializers/api/cached_enterprise_serializer_spec.rb

@@ -4,29 +4,6 @@ describe Api::CachedEnterpriseSerializer do
   let(:cached_enterprise_serializer) { described_class.new(enterprise) }
   let(:enterprise) { create(:enterprise) }
 
-  describe '#product_properties' do
-    let(:property) { create(:property) }
-
-    before do
-      product = create(:product, properties: [property])
-      enterprise.supplied_products << product
-    end
-
-    it 'returns the properties of the products supplied by the enterprise' do
-      expect(cached_enterprise_serializer.product_properties).to eq([property])
-    end
-  end
-
-  describe '#producer_properties' do
-    let(:property) { create(:property) }
-
-    before { enterprise.properties << property }
-
-    it 'returns the properties of the enterprise' do
-      expect(cached_enterprise_serializer.producer_properties).to eq([property])
-    end
-  end
-
   describe '#supplied_properties' do
     let(:property) { create(:property, presentation: 'One') }
     let(:duplicate_property) { create(:property, presentation: 'One') }
@@ -42,8 +19,8 @@ describe Api::CachedEnterpriseSerializer do
     end
 
     it "removes duplicate product and producer properties" do
-      merge = cached_enterprise_serializer.supplied_properties
-      expect(merge).to eq([property, different_property])
+      properties = cached_enterprise_serializer.supplied_properties
+      expect(properties).to eq([property, different_property])
     end
   end
 end