fix: correct a problem where survey items with insufficient responses were contributing to the response rate calculation

app/models/student_response_rate_calculator.rb

@@ -43,8 +43,12 @@ class StudentResponseRateCalculator < ResponseRateCalculator
       quarter_of_grade = enrollment_by_grade[grade] / 4
       threshold = threshold > quarter_of_grade ? quarter_of_grade : threshold
 
-      si = SurveyItemResponse.student_survey_items_with_sufficient_responses_by_grade(school:, academic_year:,
-                                                                                      threshold:)
+      si = SurveyItemResponse.student_survey_items_with_sufficient_responses_by_grade(school:,
+                                                                                      academic_year:)
+      si = si.reject do |_key, value|
+        value < threshold
+      end
+
       ssi = @subcategory.survey_items.student_survey_items.map(&:id)
       grade_array = Array.new(ssi.length, grade)
 

app/models/survey_item_response.rb

@@ -70,13 +70,12 @@ class SurveyItemResponse < ActiveRecord::Base
     @teacher_survey_items_with_sufficient_responses[[school, academic_year]]
   end
 
-  def self.student_survey_items_with_sufficient_responses_by_grade(school:, academic_year:, threshold:)
+  def self.student_survey_items_with_sufficient_responses_by_grade(school:, academic_year:)
     @student_survey_items_with_sufficient_responses_by_grade ||= Hash.new do |memo, (school, academic_year)|
       hash = SurveyItem.joins("inner join survey_item_responses on  survey_item_responses.survey_item_id = survey_items.id")
                        .student_survey_items
                        .where("survey_item_responses.school": school, "survey_item_responses.academic_year": academic_year)
                        .group(:grade, :id)
-                       .having("count(*) >= #{threshold}")
                        .count
       memo[[school, academic_year]] = hash
     end