Set a minimum threshold of 10 survey item responses to calculate scores per survey item

app/models/measure.rb

@@ -24,11 +24,15 @@ class Measure < ActiveRecord::Base
     @student_survey_items ||= survey_items.student_survey_items
   end
 
-  def student_survey_items_by_survey_type(school:, academic_year:)
+  def student_survey_items_with_sufficient_responses(school:, academic_year:)
-    survey = Survey.where(school:, academic_year:).first
+    SurveyItem.where(id: SurveyItem.joins('inner join survey_item_responses on survey_item_responses.survey_item_id = survey_items.id')
-    return student_survey_items.short_form_items if survey.form == 'short'
+                                .student_survey_items
-
+                                .where("survey_item_responses.school": school,
-    student_survey_items
+                                       "survey_item_responses.academic_year": academic_year,
+                                       "survey_item_responses.survey_item_id": survey_items.student_survey_items)
+                                .group('survey_items.id')
+                                .having('count(*) >= 10')
+                                .count.keys)
   end
 
   def teacher_scales
@@ -244,7 +248,7 @@ class Measure < ActiveRecord::Base
 
   def student_average(school:, academic_year:)
     @student_average ||= Hash.new do |memo, (school, academic_year)|
-      survey_items = student_survey_items_by_survey_type(school:, academic_year:)
+      survey_items = student_survey_items_with_sufficient_responses(school:, academic_year:)
       memo[[school, academic_year]] = collect_survey_item_average(survey_items:, school:, academic_year:)
     end
     @student_average[[school, academic_year]]

spec/models/measure_spec.rb

@@ -294,6 +294,46 @@ RSpec.describe Measure, type: :model do
       let(:short_form_student_survey_item_2) { create(:student_survey_item, scale: student_scale, on_short_form: true) }
       let(:short_form_student_survey_item_3) { create(:student_survey_item, scale: student_scale, on_short_form: true) }
 
+      context "and the number of responses for each of the measure's survey items does not meet the student threshold " do
+        before :each do
+          create_list(:survey_item_response, SurveyItemResponse::STUDENT_RESPONSE_THRESHOLD - 1,
+                      survey_item: student_survey_item_1, academic_year:, school:, likert_score: 3)
+          create_list(:survey_item_response, SurveyItemResponse::STUDENT_RESPONSE_THRESHOLD - 1,
+                      survey_item: student_survey_item_2, academic_year:, school:, likert_score: 4)
+          create_list(:survey_item_response, SurveyItemResponse::STUDENT_RESPONSE_THRESHOLD - 1,
+                      survey_item: student_survey_item_3, academic_year:, school:, likert_score: 5)
+        end
+        it 'it does not return an average score' do
+          expect(measure.score(school:, academic_year:).average).to eq nil
+        end
+      end
+
+      context 'and one survey item has sufficient responses but other items do not meet the threshold' do
+        before :each do
+          create_list(:survey_item_response, SurveyItemResponse::STUDENT_RESPONSE_THRESHOLD,
+                      survey_item: student_survey_item_1, academic_year:, school:, likert_score: 3)
+          create_list(:survey_item_response, SurveyItemResponse::STUDENT_RESPONSE_THRESHOLD - 1,
+                      survey_item: student_survey_item_2, academic_year:, school:, likert_score: 4)
+          create_list(:survey_item_response, SurveyItemResponse::STUDENT_RESPONSE_THRESHOLD - 1,
+                      survey_item: student_survey_item_3, academic_year:, school:, likert_score: 5)
+        end
+        it 'it does not return an average score' do
+          expect(measure.score(school:, academic_year:).average).to eq 3
+        end
+      end
+      context 'and two survey items have sufficient responses but other items do not meet the threshold' do
+        before :each do
+          create_list(:survey_item_response, SurveyItemResponse::STUDENT_RESPONSE_THRESHOLD,
+                      survey_item: student_survey_item_1, academic_year:, school:, likert_score: 3)
+          create_list(:survey_item_response, SurveyItemResponse::STUDENT_RESPONSE_THRESHOLD,
+                      survey_item: student_survey_item_2, academic_year:, school:, likert_score: 4)
+          create_list(:survey_item_response, SurveyItemResponse::STUDENT_RESPONSE_THRESHOLD - 1,
+                      survey_item: student_survey_item_3, academic_year:, school:, likert_score: 5)
+        end
+        it 'it does not return an average score' do
+          expect(measure.score(school:, academic_year:).average).to eq 3.5
+        end
+      end
       context "and the number of responses for each of the measure's survey items meets the student threshold " do
         before :each do
           create_list(:survey_item_response, SurveyItemResponse::STUDENT_RESPONSE_THRESHOLD,
@@ -316,22 +356,6 @@ RSpec.describe Measure, type: :model do
         end
       end
 
-      context "and the average number of responses across the measure's survey items meets the student threshold " do
-        before :each do
-          create_list(:survey_item_response,  SurveyItemResponse::STUDENT_RESPONSE_THRESHOLD + 1, survey_item: student_survey_item_1, academic_year:,
-                                                                                                  school:, likert_score: 3)
-          create_list(:survey_item_response,  SurveyItemResponse::STUDENT_RESPONSE_THRESHOLD, survey_item: student_survey_item_2, academic_year:,
-                                                                                              school:, likert_score: 4)
-          create_list(:survey_item_response,  SurveyItemResponse::STUDENT_RESPONSE_THRESHOLD - 1, survey_item: student_survey_item_3, academic_year:,
-                                                                                                  school:, likert_score: 5)
-        end
-
-        it 'returns the average of the likert scores of the survey items' do
-          average_score = 4
-          expect(measure.score(school:, academic_year:).average).to be_within(0.001).of(average_score)
-        end
-      end
-
       context "and none of the measure's survey items meets the student threshold " do
         before :each do
           create_list(:survey_item_response, SurveyItemResponse::STUDENT_RESPONSE_THRESHOLD - 1, survey_item: student_survey_item_1, academic_year:,
@@ -375,6 +399,18 @@ RSpec.describe Measure, type: :model do
       let(:teacher_survey_item_1) { create(:teacher_survey_item, scale: teacher_scale) }
       let(:student_survey_item_1) { create(:student_survey_item, scale: student_scale) }
 
+      context 'and there is sufficient teacher data but insufficient student data' do
+        before :each do
+          create_list(:survey_item_response, SurveyItemResponse::TEACHER_RESPONSE_THRESHOLD,
+                      survey_item: teacher_survey_item_1, academic_year:, school:, likert_score: 3)
+          create_list(:survey_item_response, SurveyItemResponse::STUDENT_RESPONSE_THRESHOLD - 1,
+                      survey_item: student_survey_item_1, academic_year:, school:, likert_score: 5)
+        end
+
+        it 'returns the average of the likert scores of the survey items' do
+          expect(measure.score(school:, academic_year:).average).to eq 3
+        end
+      end
       context 'and there is sufficient teacher data and sufficient student data' do
         before :each do
           create_list(:survey_item_response, SurveyItemResponse::TEACHER_RESPONSE_THRESHOLD,

spec/presenters/grouped_bar_column_presenter_spec.rb

@@ -129,10 +129,10 @@ describe GroupedBarColumnPresenter do
     end
     context 'when more than one year exists' do
       before do
-        create(:survey_item_response,  survey_item: student_survey_item_for_composite_measure, school:,
+        create_list(:survey_item_response, SurveyItemResponse::STUDENT_RESPONSE_THRESHOLD, survey_item: student_survey_item_for_composite_measure, school:,
-                                       academic_year: another_academic_year, likert_score: 5)
+                                                                                           academic_year: another_academic_year, likert_score: 5)
-        create(:survey_item_response,  survey_item: student_survey_item_for_composite_measure, school:,
+        create_list(:survey_item_response, SurveyItemResponse::STUDENT_RESPONSE_THRESHOLD, survey_item: student_survey_item_for_composite_measure, school:,
-                                       academic_year: another_academic_year, likert_score: 3)
+                                                                                           academic_year: another_academic_year, likert_score: 3)
       end
       it 'returns independent scores for each year of data' do
         expect(all_data_presenter.score(0).average).to eq 4.5
@@ -205,10 +205,10 @@ describe GroupedBarColumnPresenter do
 
       context 'when there is more than one years worth of data to show' do
         before do
-          create(:survey_item_response,  survey_item: student_survey_item, school:,
+          create_list(:survey_item_response, SurveyItemResponse::STUDENT_RESPONSE_THRESHOLD, survey_item: student_survey_item, school:,
-                                         academic_year: another_academic_year, likert_score: 3)
+                                                                                             academic_year: another_academic_year, likert_score: 3)
-          create(:survey_item_response,  survey_item: student_survey_item, school:,
+          create_list(:survey_item_response, SurveyItemResponse::STUDENT_RESPONSE_THRESHOLD, survey_item: student_survey_item, school:,
-                                         academic_year: another_academic_year, likert_score: 4)
+                                                                                             academic_year: another_academic_year, likert_score: 4)
         end
 
         it 'returns only bars that have a numeric score' do
@@ -305,8 +305,8 @@ describe GroupedBarColumnPresenter do
     end
     context 'when there are enough responses to calculate a score' do
       before do
-        create(:survey_item_response,  survey_item: teacher_survey_item, school:,
+        create(:survey_item_response, survey_item: teacher_survey_item, school:,
-                                       academic_year:)
+                                      academic_year:)
       end
 
       it 'indicates it should show the insufficient data message' do