Change race score calculations so the average bubbles up through survey_items

-> scales -> measure.
Precalculate averages for performance.

app/models/measure.rb

@@ -147,7 +147,7 @@ class Measure < ActiveRecord::Base
   def collect_survey_item_average(survey_items:, school:, academic_year:)
     @collect_survey_item_average ||= Hash.new do |memo, (survey_items, school, academic_year)|
       averages = survey_items.map do |survey_item|
-        grouped_responses(school:, academic_year:)[survey_item]
+        grouped_responses(school:, academic_year:)[survey_item.id]
       end.remove_blanks
       memo[[survey_items, school, academic_year]] = averages.average || 0
     end
@@ -169,7 +169,7 @@ class Measure < ActiveRecord::Base
   def grouped_responses(school:, academic_year:)
     @grouped_responses ||= Hash.new do |memo, (school, academic_year)|
       memo[[school, academic_year]] =
-        SurveyItemResponse.where(school:, academic_year:).group(:survey_item).average(:likert_score)
+        SurveyItemResponse.where(school:, academic_year:).group(:survey_item_id).average(:likert_score)
     end
     @grouped_responses[[school, academic_year]]
   end

app/models/race_score.rb

@@ -0,0 +1,6 @@
+class RaceScore < ApplicationRecord
+  belongs_to :measure
+  belongs_to :school
+  belongs_to :academic_year
+  belongs_to :race
+end

app/models/race_score_calculator.rb

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+class RaceScoreCalculator
+  include Analyze::Graph::Column::RacialScore
+  attr_reader :measure, :school, :academic_year, :race
+
+  def initialize(measure:, school:, academic_year:, race:)
+    @measure = measure
+    @school = school
+    @academic_year = academic_year
+    @race = race
+  end
+
+  def score
+    race_score(measure:, school:, academic_year:, race:)
+  end
+end

app/models/sample.rb

@@ -0,0 +1,12 @@
+class Sample
+  attr_reader :school, :academic_year, :category, :measure, :race
+
+  def initialize
+    @school = School.find_by_slug 'milford-high-school'
+    @academic_year = AcademicYear.last
+    @category = Category.find_by_category_id '1'
+    @subcategory = Subcategory.find_by_subcategory_id '1A'
+    @measure = Measure.find_by_measure_id '1A-ii'
+    @race = Race.find_by_qualtrics_code 1
+  end
+end

app/models/student.rb

@@ -1,7 +1,7 @@
 class Student < ApplicationRecord
   has_many :survey_item_responses
   has_many :student_races
-  has_many :races, through: :student_races
+  has_and_belongs_to_many :races, join_table: :student_races
 
   encrypts :lasid, deterministic: true
 end