Make retrieving user's active threads faster

The user profile page in the LMS only displays the thread title and
body, not comments, so do not bother returning them.

api/users.rb

@@ -42,8 +42,7 @@ get "#{APIPREFIX}/users/:user_id/active_threads" do |user_id|
   end
 
   presenter = ThreadPresenter.new(paged_active_threads.to_a, user, params[:course_id])
-  collection = presenter.to_hash_array(true)
-  collection = author_contents_only(collection, user_id)
+  collection = presenter.to_hash_array()
 
   json_output = nil
   self.class.trace_execution_scoped(['Custom/get_user_active_threads/json_serialize']) do

lib/helpers.rb

@@ -198,18 +198,6 @@ helpers do
     end
   end
 
-  def author_contents_only(contents, author_id)
-    contents.map do |content|
-      content['children'] = author_contents_only(content['children'], author_id)
-      if content['children'].length > 0 or \
-          (content['user_id'] == author_id and not content['anonymous'] and not content['anonymous_to_peers'])
-        content
-      else
-        nil
-      end
-    end.compact
-  end
-
   def notifications_by_date_range_and_user_ids start_date_time, end_date_time, user_ids  
     #given a date range and a user, find all of the notifiable content
     #key by thread id, and return notification messages for each user
@@ -301,7 +289,6 @@ helpers do
   add_method_tracer :comment
   add_method_tracer :flag_as_abuse
   add_method_tracer :un_flag_as_abuse
-  add_method_tracer :author_contents_only
   add_method_tracer :handle_threads_query
 
 end

spec/api/user_spec.rb

@@ -64,30 +64,23 @@ describe "app" do
         last_response.body.should == "{}"
       end
 
-      it "only returns threads with activity from the specified user" do
+      it "only returns threads with activity from the specified user"  do
+        @comments["t3 c4"].author = @users["u100"]
+        @comments["t3 c4"].save!
         rs = thread_result 100, course_id: "xyz"
-        rs.length.should == 1
-        check_thread_result(@users["u100"], @threads["t0"], rs.first, true)      
-        rs.first["children"].length.should == 5
-      end
-
-      it "does not include anonymous leaves" do
-        @comments["t0 c4"].anonymous = true
-        @comments["t0 c4"].save!
-        rs = thread_result 100, course_id: "xyz"
-        rs.length.should == 1
-        check_thread_result(@users["100"], @threads["t0"], rs.first, false)
-        rs.first["children"].length.should == 4
+        rs.length.should == 2
+        check_thread_result(@users["u100"], @threads["t3"], rs[0], false)
+        check_thread_result(@users["u100"], @threads["t0"], rs[1], false)
       end
 
-      it "does not include anonymous-to-peers leaves" do
-        @comments["t0 c3"].anonymous_to_peers = true
-        @comments["t0 c3"].save!
+      it "does not return threads in which the user has only participated anonymously" do
+        @comments["t3 c4"].author = @users["u100"]
+        @comments["t3 c4"].anonymous_to_peers = true
+        @comments["t3 c4"].save!
         rs = thread_result 100, course_id: "xyz"
         rs.length.should == 1
-        check_thread_result(@users["100"], @threads["t0"], rs.first, false)
-        rs.first["children"].length.should == 4
-      end
+        check_thread_result(@users["u100"], @threads["t0"], rs.first, false)
+      end      
 
       it "only returns threads from the specified course" do
         @threads.each do |k, v|
@@ -113,38 +106,6 @@ describe "app" do
         actual_order.should == expected_order
       end
 
-      it "only returns content authored by the specified user, and ancestors of that content" do
-        # by default, number of comments returned by u100 would be 5
-        @comments["t0 c2"].author = @users["u101"]
-        # now 4
-        make_comment(@users["u100"], @comments["t0 c2"], "should see me")
-        # now 5
-        make_comment(@users["u101"], @comments["t0 c2"], "should not see me")
-        make_comment(@users["u100"], @threads["t1"], "should see me")
-        # now 6
-        make_comment(@users["u101"], @threads["t1"], "should not see me")
-        rs = thread_result 100, course_id: "xyz"
-        rs.length.should == 2
-        # the leaf of every subtree in the rs must have author==u100
-        # and the comment count should match our expectation
-        expected_comment_count = 6
-        @actual_comment_count = 0
-        def check_leaf(result)
-          if !result["children"] or result["children"].length == 0
-            result["username"].should == "user100"
-            @actual_comment_count += 1
-          else
-            result["children"].each do |child|
-              check_leaf(child)
-            end
-          end
-        end 
-        rs.each do |r|
-          check_leaf(r)
-        end
-        @actual_comment_count.should == expected_comment_count
-      end
-    
       # TODO: note the checks on result["num_pages"] are disabled.
       # there is a bug in GET "#{APIPREFIX}/users/:user_id/active_threads
       # and this value is often wrong.