Show the PDC Discovery url on the work show page (#1443)

This will let us more easily check whether the work has yet appeared in
PDC Discovery, separate from whether the ARK and DOI redirection have
worked as expected.

app/models/work.rb

@@ -541,6 +541,10 @@ def has_rights?(rights_id)
     resource.rights_many.index { |rights| rights.identifier == rights_id } != nil
   end
 
+  def doi_attribute_url
+    "https://datacommons.princeton.edu/discovery/doi/#{doi}"
+  end
+
   protected
 
     # This must be protected, NOT private for ActiveRecord to work properly with this attribute.
@@ -679,10 +683,6 @@ def publish_doi(user)
       retry
     end
 
-    def doi_attribute_url
-      "https://datacommons.princeton.edu/discovery/doi/#{doi}"
-    end
-
     def doi_attribute_resource
       PDCMetadata::Resource.new_from_jsonb(metadata)
     end

app/views/works/show.html.erb

@@ -197,6 +197,13 @@
         <dd><%= link_to(@work.resource.ark, ark_url(@work.resource.ark)) %></dd>
       <% end %>
 
+      <% if @work.resource.doi %>
+        <dt>Discovery URL</dt>
+        <dd>
+          <%= link_to(@work.doi_attribute_url, @work.doi_attribute_url) %>
+        </dd>
+      <% end %>
+
       <% if @work.resource.individual_contributors.count > 0 %>
         <dt>Individual Contributors</dt>
         <dd>

spec/system/work_show_spec.rb

@@ -45,7 +45,7 @@
     end
   end
 
-  it "foo" do
+  it "uses datatables for easy navigation" do
     sign_in user
     visit work_path(work)
 
@@ -59,6 +59,12 @@
     page.driver.go_forward
   end
 
+  it "shows the PDC Discovery URL" do
+    sign_in user
+    visit work_path(work)
+    expect(page).to have_link("https://datacommons.princeton.edu/discovery/doi/10.34770/r2dz-ys12")
+  end
+
   it "copies DOI to the clipboard" do
     sign_in user
     visit work_path(work)