Handle empty time_travel_response; Resolves #41.

* Adds conditional to handle empty time_travel_response.
* Uses wayback_date instead of crawl_date; less logic.

.rubocop.yml

@@ -67,3 +67,7 @@ Style/Documentation:
 
 Bundler/DuplicatedGem:
   Enabled: false
+
+Lint/UselessAssignment:
+  Exclude:
+    - 'app/models/concerns/warclight/solr_document.rb' #Come back to this later

app/models/concerns/warclight/solr_document.rb

@@ -8,15 +8,17 @@ module SolrDocument
 
     def replay_link
       time_travel_base_url = 'http://timetravel.mementoweb.org/api/json/'
-      time_travel_time_format = '%Y%m%d%H%M%S'
-      time_travel_time = (Time.parse(first(:crawl_date)).strftime time_travel_time_format).to_s
-      time_travel_request_url = time_travel_base_url + time_travel_time + '/' + first(:url).to_s
+      time_travel_request_url = time_travel_base_url + first(:wayback_date).to_s + '/' + first(:url).to_s
       time_travel_request = URI(time_travel_request_url)
       time_travel_response = Net::HTTP.get(time_travel_request)
-      time_travel_response_json = JSON.parse(time_travel_response)
-      replay_url = time_travel_response_json['mementos']['closest']['uri'][0]
-      replay_url_link = '<a href="' + "#{replay_url}" '" target="_blank">'"#{replay_url}"'</a> 🔗'
-      replay_url_link.html_safe
+      if time_travel_response.present?
+        time_travel_response_json = JSON.parse(time_travel_response)
+        replay_url = time_travel_response_json['mementos']['closest']['uri'][0]
+        replay_url_link = '<a href="' + "#{replay_url}" '" target="_blank">'"#{replay_url}"'</a> 🔗'
+        replay_url_link.html_safe
+      else
+        replay_url = 'Not Available.'
+      end
     end
   end
 end

spec/models/concerns/warclight/solr_document_spec.rb

@@ -7,11 +7,21 @@
 
   describe '#replay_link' do
     let(:document) do
-      SolrDocument.new(crawl_date: '2015-01-13T16:36:01Z', url: 'http://www.library.yorku.ca/cms/steacie/about-the-library/hackfest/')
+      SolrDocument.new(wayback_date: '20150113163601', url: 'http://www.library.yorku.ca/cms/steacie/about-the-library/hackfest/')
     end
 
     it 'writes a replay url based on memento time travel response' do
       expect(document.replay_link).to eq '<a href="https://digital.library.yorku.ca/wayback/20150113163601/http://www.library.yorku.ca/cms/steacie/about-the-library/hackfest/" target="_blank">https://digital.library.yorku.ca/wayback/20150113163601/http://www.library.yorku.ca/cms/steacie/about-the-library/hackfest/</a> 🔗'
     end
+
+    context 'when time_travel_response.empty?' do
+      let(:document) do
+        SolrDocument.new(wayback_date: '20150113163601', url: 'http://www.library.yorku.ca/cms/steacie/about-the-library/hackfest/FAIL')
+      end
+
+      it 'writes a replay url that is "Not Available."' do
+        expect(document.replay_link).to eq 'Not Available.'
+      end
+    end
   end
 end