fix missing policy not adding grade change records

fixes EVAL-279
flag=fix_missing_policy_grade_change_records

Test Plan
- Enable the Fix Missing Policy Grade Change Records feature flag as
  site admin.
- Set up a missing policy.
- Create an assignment due soon.
- After the due date/time passes, check Gradebook History. This may
  require another 5 minutes as MissingPolicyApplicator runs on
  intervals. Verify that the grade assigned by the missing policy
  appears in Gradebook History.

- Disable the feature flag and verify that the above no longer
  happens.

Change-Id: I6fa8319d9d98b9013d2938e61eb22542ea176058
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/250112
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
QA-Review: Gary Mei <gmei@instructure.com>
Product-Review: Jody Sailor
Reviewed-by: Adrian Packel <apackel@instructure.com>
Reviewed-by: Spencer Olson <solson@instructure.com>

config/feature_flags/apogee_release_flags.yml

@@ -69,3 +69,8 @@ view_ungraded_as_zero:
   display_name: View Ungraded as Zero View in Gradebook
   description: The Gradebook will factor in ungraded submissions as if they were given a score of zero for
     calculations. This is just a view for the teacher, and does not affect actual scoring.
+fix_missing_policy_grade_change_records:
+  state: hidden
+  applies_to: SiteAdmin
+  display_name: Fix Missing Policy Grade Change Records
+  description: Insert a grade change record when the periodic MissingPolicyApplicator job runs on a submission.

lib/missing_policy_applicator.rb

@@ -50,7 +50,9 @@ class MissingPolicyApplicator
     now = Time.zone.now
 
     GuardRail.activate(:primary) do
-      Submission.active.where(id: submissions).update_all(
+      submissions = Submission.active.where(id: submissions)
+
+      submissions.update_all(
         score: score,
         grade: grade,
         graded_at: now,
@@ -62,6 +64,10 @@ class MissingPolicyApplicator
         workflow_state: "graded"
       )
 
+      if Account.site_admin.feature_enabled?(:fix_missing_policy_grade_change_records)
+        submissions.reload.each { |sub| sub.grade_change_audit(force_audit: true) }
+      end
+
       if assignment.course.root_account.feature_enabled?(:missing_policy_applicator_emits_live_events)
         Canvas::LiveEvents.send_later_if_production(:submissions_bulk_updated, submissions)
       end

spec/lib/missing_policy_applicator_spec.rb

@@ -297,6 +297,60 @@ describe MissingPolicyApplicator do
       expect(submission.reload.grade_matches_current_submission).to be true
     end
 
+    describe "grade change events" do
+      before(:each) do
+        allow(Auditors).to receive(:config).and_return({'write_paths' => ['active_record'], 'read_path' => 'active_record'})
+        late_policy_missing_enabled
+        create_recent_assignment
+        @assignment = @course.assignments.last
+        @submission = @assignment.submissions.first
+        # The act of creating an assignment due in the past applies the missing
+        # policy on the submissions separately from MissingPolicyApplicator, so
+        # in order to test that MissingPolicyApplicator inserts grade change
+        # events, we have to delete any existing ones first, otherwise we may
+        # just be picking up on the ones generated by assignment creation.
+        Auditors::GradeChange.
+          for_assignment(@assignment).paginate(per_page: 10).
+          select { |gc| gc.submission_id == @submission.id }.
+          each { |gc| gc.destroy! }
+      end
+
+      context "when fix_missing_policy_grade_change_records flag is enabled" do
+        before(:each) do
+          Account.site_admin.enable_feature!(:fix_missing_policy_grade_change_records)
+        end
+
+        it "inserts a grade change for affected submissions" do
+          @submission.update_columns(score: nil, grade: nil)
+          applicator.apply_missing_deductions
+          grade_changes = Auditors::GradeChange.for_assignment(@assignment).paginate(per_page: 10)
+          expect(grade_changes.find { |gc| gc.submission_id == @submission.id }).not_to be_nil
+        end
+
+        it "the inserted grade change contains the correct score before/after values" do
+          @submission.update_columns(score: nil, grade: nil)
+          applicator.apply_missing_deductions
+          grade_changes = Auditors::GradeChange.for_assignment(@assignment).paginate(per_page: 10)
+          submission_event = grade_changes.find { |gc| gc.submission_id == @submission.id }
+          expect(submission_event.score_before).to be_nil
+          expect(submission_event.score_after).to be 0.375
+        end
+      end
+
+      context "when fix_missing_policy_grade_change_records flag is not enabled" do
+        before(:each) do
+          Account.site_admin.disable_feature!(:fix_missing_policy_grade_change_records)
+        end
+
+        it "does not insert a grade change for affected submissions" do
+          @submission.update_columns(score: nil, grade: nil)
+          applicator.apply_missing_deductions
+          grade_changes = Auditors::GradeChange.for_assignment(@assignment).paginate(per_page: 10)
+          expect(grade_changes.find { |gc| gc.submission_id == @submission.id }).to be_nil
+        end
+      end
+    end
+
     describe "posting submissions" do
       let(:assignment) { @course.assignments.first }
       let(:submission) { assignment.submissions.first }
@@ -308,13 +362,14 @@ describe MissingPolicyApplicator do
       end
 
       it "posts affected submissions if the assignment is automatically posted" do
+        submission.update_column(:posted_at, nil)
         applicator.apply_missing_deductions
         expect(submission.reload).to be_posted
       end
 
-      it "sets posted_at to nil for submissions if the assignment is manually posted" do
+      it "does not post affected submissions if the assignment is manually posted" do
-        submission.update!(posted_at: Time.zone.now)
         assignment.post_policy.update!(post_manually: true)
+        submission.update_column(:posted_at, nil)
         applicator.apply_missing_deductions
         expect(submission.reload).not_to be_posted
       end