Add viewingDirection as optional data value on manifest, fixes #12

lib/iiif_manifest/manifest_builder/record_property_builder.rb

@@ -11,6 +11,7 @@ def apply(manifest)
         manifest.label = record.to_s
         manifest.description = record.description
         manifest.viewing_hint = viewing_hint if viewing_hint.present?
+        manifest.viewing_direction = viewing_direction if viewing_direction.present?
         manifest.metadata = record.manifest_metadata if valid_metadata?
         manifest
       end
@@ -21,6 +22,10 @@ def viewing_hint
         (record.respond_to?(:viewing_hint) && record.send(:viewing_hint))
       end
 
+      def viewing_direction
+        (record.respond_to?(:viewing_direction) && record.send(:viewing_direction))
+      end
+
       # Validate manifest_metadata against the IIIF spec format for metadata
       #
       # @return [Boolean]

spec/lib/iiif_manifest/manifest_factory_spec.rb

@@ -236,5 +236,18 @@ def sequence_rendering
         expect(result['sequences'].first['canvases'].length).to eq 2
       end
     end
+
+    context 'where there is no viewing_direction method' do
+      it 'does not have a viewingDirection element' do
+        expect(result['viewingDirection']).to eq nil
+      end
+    end
+
+    context 'where there is a viewing_direction method' do
+      it 'has a viewingDirection' do
+        allow_any_instance_of(Book).to receive(:viewing_direction).and_return('right-to-left')
+        expect(result.viewingDirection).to eq 'right-to-left'
+      end
+    end
   end
 end