re-include logged out submissions for quiz statistics page

Fixes a regression where an error would be thrown if trying to access a
user's submission from the quiz submission data if the user had been
logged out when submitting the quiz (aka, a temporary user).

Test Plan:
  - As a student, take a quiz, but before you submit it, log yourself
    out in another tab.
  - As the teacher in the course, go to the quiz statistics page for
    that quiz. You should not get a page error.

fixes CNVS-7320

Change-Id: Ie75ed9af46accb92755f7a1a9d32dd6b1f3e50b8
Reviewed-on: https://gerrit.instructure.com/23164
Reviewed-by: Derek DeVries <ddevries@instructure.com>
Reviewed-by: Cameron Sutter <csutter@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Myller de Araujo <myller@instructure.com>
Product-Review: Stanley Stuart <stanley@instructure.com>

app/controllers/quizzes_controller.rb

@@ -116,11 +116,11 @@ class QuizzesController < ApplicationController
               @statistics = @quiz.statistics(all_versions)
               user_ids = @statistics[:submission_user_ids]
               @submitted_users = User.where(:id => user_ids.to_a).order_by_sortable_name
+              #include logged out users
+              @submitted_users += @statistics[:submission_logged_out_users]
               @users = Hash[
                 @submitted_users.map { |u| [u.id, u] }
               ]
-              #include logged out users
-              @submitted_users += @statistics[:submission_logged_out_users]
             end
 
             js_env :quiz_reports => QuizStatistics::REPORTS.map { |report_type|

spec/controllers/quizzes_controller_spec.rb

@@ -61,6 +61,8 @@ describe QuizzesController do
     @quiz_submission = @quiz.generate_submission(user)
     @quiz_submission.mark_completed
     @quiz_submission.submission_data = yield if block_given?
+    @quiz_submission.grade_submission
+    @quiz_submission.save!
   end
 
   describe "GET 'index'" do
@@ -1028,6 +1030,9 @@ describe QuizzesController do
       response.should render_template('statistics')
     end
 
+    context "logged out submissions" do
+      integrate_views
+
       it "should include logged_out users' submissions in a public course" do
         #logged_out user
         user = temporary_user_code
@@ -1043,17 +1048,22 @@ describe QuizzesController do
         #non logged_out submissions
         @user1 = user_with_pseudonym(:active_all => true, :name => 'Student1', :username => 'student1@instructure.com')
         @quiz_submission1 = @quiz.generate_submission(@user1)
-      @quiz_submission1.mark_completed
+        @quiz_submission1.grade_submission
 
         @user2 = user_with_pseudonym(:active_all => true, :name => 'Student2', :username => 'student2@instructure.com')
         @quiz_submission2 = @quiz.generate_submission(@user2)
-      @quiz_submission2.mark_completed
+        @quiz_submission2.grade_submission
+
+        @course.large_roster = false
+        @course.save!
 
 
-      get 'statistics', :course_id => @course.id, :quiz_id => @quiz.id
+        get 'statistics', :course_id => @course.id, :quiz_id => @quiz.id, :all_versions => '1'
         response.should be_success
+        response.body.should match /Logged Out User/
         response.should render_template('statistics')
       end
+    end
 
     it "should show the statistics page if the course is a MOOC" do
       course_with_teacher_logged_in(:active_all => true)