dirty commit: can't get references to work correctly between any tables

app/models/dashboard/teacher_response_rate_calculator.rb

@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+module Dashboard
+  class TeacherResponseRateCalculator < ResponseRateCalculator
+    def survey_item_count
+      @survey_item_count ||= survey_items_with_sufficient_responses.length
+    end
+
+    def survey_items_have_sufficient_responses?
+      survey_item_count.positive?
+    end
+
+    def survey_items_with_sufficient_responses
+      @survey_items_with_sufficient_responses ||= SurveyItemResponse.teacher_survey_items_with_sufficient_responses(
+        school:, academic_year:
+      ).slice(*@subcategory.teacher_survey_items.map(&:id))
+    end
+
+    def response_count
+      @response_count ||= survey_items_with_sufficient_responses&.values&.sum
+    end
+
+    def total_possible_responses
+      @total_possible_responses ||= respondents.total_teachers
+    end
+
+    def raw_response_rate
+      (average_responses_per_survey_item / total_possible_responses.to_f * 100).round
+    end
+  end
+end