Add endoresed information for threads.

models/comment_thread.rb

@@ -145,6 +145,10 @@ class CommentThread < Content
     subscriptions.map(&:subscriber)
   end
 
+  def endorsed?
+    comments.where(endorsed: true).exists?
+  end
+
   def to_hash(params={})
     doc = as_document.slice(*%w[title body course_id anonymous commentable_id created_at updated_at at_position_list closed])
                      .merge("id" => _id)
@@ -153,6 +157,7 @@ class CommentThread < Content
                      .merge("votes" => votes.slice(*%w[count up_count down_count point]))
                      .merge("tags" => tags_array)
                      .merge("type" => "thread")
+                     .merge("endorsed" => endorsed?)
 
     if params[:recursive]
       doc = doc.merge("children" => root_comments.map{|c| c.to_hash(recursive: true)})

spec/models/comment_thread.rb → spec/models/comment_thread_spec.rb

@@ -20,4 +20,28 @@ describe CommentThread do
     CommentThread.tag_name_valid?("_this-is-a-tag").should be_false
     CommentThread.tag_name_valid?("this-is+a-tag").should be_false
   end
+
+  context "endorsed?" do
+
+    it "knows if it is #endorsed?" do
+      thread = CommentThread.new
+      criteria = build_criteria(thread, :exists? => true)
+      thread.endorsed?.should be_true
+    end
+
+    it "knows when it is not #endorsed?" do
+      thread = CommentThread.new
+      criteria = build_criteria(thread, :exists? => false)
+      thread.endorsed?.should be_false
+    end
+
+    def build_criteria(thread, options)
+      double("criteria").tap do |criteria|
+        comments = double("relation")
+        comments.stub(:where).with(endorsed: true).and_return(criteria)
+        thread.stub(:comments).and_return(comments)
+        criteria.stub(options)
+      end
+    end
+  end
 end