Merge pull request #834 from projectblacklight/issue-833

deep-merge context data attributes with link_to_document options; fixes #833

Author: jcoyne

app/helpers/blacklight/url_helper_behavior.rb

@@ -27,7 +27,7 @@ def link_to_document(doc, opts={:label=>nil, :counter => nil})
   end
 
   def document_link_params(doc, opts)
-    session_tracking_params(doc, opts[:counter]).merge(opts.reject { |k,v| [:label, :counter].include? k  })
+    session_tracking_params(doc, opts[:counter]).deep_merge(opts.except(:label, :counter))
   end
   protected :document_link_params
 

spec/helpers/url_helper_spec.rb

@@ -248,6 +248,14 @@
       expect(helper.link_to_document(@document, { :label => :title_display, :counter => 5  })).to match /\/catalog\/123456\/track\?counter=5/
     end
 
+    it "should merge the data- attributes from the options with the counter params" do
+      data = {'id'=>'123456','title_display'=>['654321']}
+      @document = SolrDocument.new(data)
+      link = helper.link_to_document @document, { data: { x: 1 }  }
+      expect(link).to have_selector '[data-x]'
+      expect(link).to have_selector '[data-context-href]'
+    end
+
     it "passes on the title attribute to the link_to_with_data method" do
       @document = SolrDocument.new('id'=>'123456')
       expect(helper.link_to_document(@document,:label=>"Some crazy long label...",:title=>"Some crazy longer label")).to match(/title=\"Some crazy longer label\"/)