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

app/models/dashboard/respondent.rb

@@ -0,0 +1,27 @@
+module Dashboard
+  class Respondent < ApplicationRecord
+    belongs_to :dashboard_school
+    belongs_to :dashboard_academic_year
+
+    validates :school, uniqueness: { scope: :academic_year }
+
+    def enrollment_by_grade
+      @enrollment_by_grade ||= {}.tap do |row|
+        attributes = %i[pk k one two three four five six seven eight nine ten eleven twelve]
+        grades = [-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
+        attributes.zip(grades).each do |attribute, grade|
+          count = send(attribute) if send(attribute).present?
+          row[grade] = count unless count.nil? || count.zero?
+        end
+      end
+    end
+
+    def self.by_school_and_year(school:, academic_year:)
+      @by_school_and_year ||= Hash.new do |memo, (school, academic_year)|
+        memo[[school, academic_year]] = Respondent.find_by(school:, academic_year:)
+      end
+
+      @by_school_and_year[[school, academic_year]]
+    end
+  end
+end