Mapping language codes to names

.rubocop.yml

@@ -129,3 +129,9 @@ RSpec/DescribeClass:
     - 'spec/views/**/*'
     - 'spec/routing/**/*'
     - 'spec/inputs/**/*'
+
+Rails/DynamicFindBy:
+  Exclude:
+    - 'app/decorators/applies_title_from_slug.rb'
+    - 'app/models/exhibit_proxy.rb'
+    - 'app/services/language_service.rb'

Gemfile

@@ -77,6 +77,7 @@ gem 'sitemap_generator'
 gem 'blacklight-gallery', '>= 0.3.0'
 gem 'blacklight-oembed'
 gem 'devise_invitable'
+gem 'iso-639'
 gem 'iiif-presentation'
 gem 'omniauth-cas'
 gem 'sneakers'

Gemfile.lock

@@ -251,6 +251,7 @@ GEM
       activesupport (>= 3.2.18)
       faraday (~> 0.9.0)
       json
+    iso-639 (0.2.8)
     jbuilder (2.6.0)
       activesupport (>= 3.0.0, < 5.1)
       multi_json (~> 1.2)
@@ -554,6 +555,7 @@ DEPENDENCIES
   factory_girl_rails
   friendly_id!
   iiif-presentation
+  iso-639
   jbuilder (~> 2.0)
   jquery-rails
   omniauth-cas

app/controllers/catalog_controller.rb

@@ -9,7 +9,7 @@ def search_across_settings
     blacklight_config.add_index_field 'readonly_subject_tesim', label: 'Subject'
     blacklight_config.add_index_field 'readonly_description_tesim', label: 'Description'
 
-    blacklight_config.add_facet_field 'readonly_language_ssim', label: 'Language'
+    blacklight_config.add_facet_field 'readonly_language_ssim', label: 'Language', helper_method: :render_language_facet
     blacklight_config.add_facet_field 'readonly_format_ssim', label: 'Format'
     unique_custom_fields.each do |field|
       blacklight_config.add_show_field field.field, label: field.configuration["label"]

app/helpers/catalog_helper.rb

@@ -0,0 +1,15 @@
+module CatalogHelper
+  include Blacklight::CatalogHelperBehavior
+
+  def render_language_facet(value)
+    content_tag(:span, label_for_code(value))
+  end
+
+  def label_for_code(code)
+    LanguageService.label_for_code(code)
+  end
+
+  def label_for_value(document)
+    label_for_code((document[:value] || []).first)
+  end
+end

app/presenters/rtl_index_presenter.rb

@@ -40,4 +40,9 @@ def label_value(value, config)
         field_values(config, value: value)
       end
     end
+
+    def field_values(field_config, options = {})
+      field_config.helper_method = :label_for_value if field_config.key == 'readonly_language_tesim'
+      super(field_config, options)
+    end
 end

app/presenters/rtl_show_presenter.rb

@@ -16,7 +16,7 @@ def field_value_separator
   #   @options opts [String] :value
   def field_value(field, options = {})
     tags = super.split(field_value_separator).collect do |value|
-      content_tag(:li, value, dir: value.dir)
+      mapping_content_tag(field, :li, value, dir: value.dir)
     end
 
     content_tag(:ul) do
@@ -42,4 +42,9 @@ def field_config(field)
         }
     end
   end
+
+  def mapping_content_tag(field, tag, value, options = {})
+    value = LanguageService.label_for_code(value) if field == 'readonly_language_tesim'
+    content_tag(tag, value, options)
+  end
 end

app/services/language_service.rb

@@ -0,0 +1,5 @@
+class LanguageService
+  def self.label_for_code(code)
+    ISO_639.find_by_code(code).try(:english_name) || code
+  end
+end

spec/helpers/catalog_helper_spec.rb

@@ -0,0 +1,36 @@
+require 'rails_helper'
+
+describe CatalogHelper do
+  let(:helper) { TestingHelper.new }
+  let(:document) { { value: ['ara'] } }
+  before do
+    class TestingHelper
+      include CatalogHelper
+      include ActionView::Helpers::TagHelper
+      include ActionView::Helpers::UrlHelper
+      include ActionView::Context
+    end
+  end
+  after do
+    Object.send(:remove_const, :TestingHelper)
+  end
+
+  describe '#render_language_facet' do
+    it 'maps the code to the language name' do
+      allow(helper).to receive(:content_tag).with(:span, 'Italian')
+      helper.render_language_facet('ita')
+    end
+  end
+
+  describe '#label_for_code' do
+    it 'maps the code to the language name' do
+      expect(helper.label_for_code('eng')).to eq 'English'
+    end
+  end
+
+  describe '#label_for_value' do
+    it 'maps the code to the language name' do
+      expect(helper.label_for_value(document)).to eq 'Arabic'
+    end
+  end
+end

spec/presenters/rtl_show_presenter_spec.rb

@@ -31,4 +31,13 @@
       expect(presenter.header).to eq "<ul><li dir=\"rtl\">بي</li><li dir=\"ltr\">Test</li></ul>"
     end
   end
+
+  describe "#mapping_content_tag" do
+    context "when given a language code" do
+      it "maps the code to the language name" do
+        tag = '<li dir="ltr">Arabic</li>'
+        expect(presenter.mapping_content_tag('readonly_language_tesim', :li, 'ara', dir: :ltr)).to eq tag
+      end
+    end
+  end
 end