create measure by grade file

app/models/report/measure_by_grade.rb

@@ -0,0 +1,29 @@
+module Report
+  class MeasureByGrade
+    def self.create_report(schools:, academic_years: AcademicYear.all, measures: ::Measure.all.order(measure_id: :ASC), filename: "measure_by_grade.csv")
+      data = to_csv(schools:, academic_years:, measures:)
+      FileUtils.mkdir_p Rails.root.join("tmp", "reports")
+      filepath = Rails.root.join("tmp", "reports", filename)
+      write_csv(data:, filepath:)
+      data
+    end
+
+    def self.to_csv(schools:, academic_years:, measures:)
+      ::School.all.map do |school|
+        ::AcademicYear.all.map do |academic_year|
+          ::Measure.all.map do |measure|
+            next 0 if measure.student_survey_items.count.zero?
+
+            measure.student_survey_items.map do |survey_item|
+              ::SurveyItemResponse.where(survey_item:, school: school, academic_year: academic_year).average(:likert_score).to_f.round(2)
+            end.remove_blanks.average
+          end
+        end
+      end
+    end
+
+    def self.write_csv(data:, filepath:)
+      File.write(filepath, csv)
+    end
+  end
+end