import students

app/models/measure.rb

@@ -183,10 +183,11 @@ class Measure < ActiveRecord::Base
   end
 
   def sufficient_student_data?(school:, academic_year:)
-    return @sufficient_student_data ||= false unless includes_student_survey_items?
-    return @sufficient_student_data ||= false if no_student_responses_exist?(school:, academic_year:)
+    false unless includes_student_survey_items?
+    false if no_student_responses_exist?(school:, academic_year:)
 
-    @sufficient_student_data ||= subcategory.response_rate(school:, academic_year:).meets_student_threshold?
+    # this gets memoized on first run so check to make sure
+    subcategory.response_rate(school:, academic_year:).meets_student_threshold?
   end
 
   def sufficient_teacher_data?(school:, academic_year:)

app/models/race.rb

@@ -1,4 +1,6 @@
 class Race < ApplicationRecord
   include FriendlyId
+  has_many :student_races
+  has_many :students, through: :student_races
   friendly_id :designation, use: [:slugged]
 end

app/models/student.rb

@@ -0,0 +1,7 @@
+class Student < ApplicationRecord
+  has_many :survey_item_responses
+  has_many :student_races
+  has_many :races, through: :student_races
+
+  encrypts :lasid, deterministic: true
+end

app/models/student_race.rb

@@ -0,0 +1,4 @@
+class StudentRace < ApplicationRecord
+  belongs_to :student
+  belongs_to :race
+end

app/models/survey_item_response.rb

@@ -7,6 +7,8 @@ class SurveyItemResponse < ActiveRecord::Base
   belongs_to :academic_year
   belongs_to :school
   belongs_to :survey_item, counter_cache: true
+  belongs_to :student, foreign_key: :student_id, optional: true
+
   has_one :measure, through: :survey_item
 
   scope :exclude_boston, lambda {