chore: prevent multiple lookups for the boston district by inlining the

sql

app/models/district.rb

@@ -15,10 +15,6 @@ class District < ApplicationRecord
     self.slug ||= name.parameterize
   end
 
-  def self.boston
-    District.find_by_name("Boston")
-  end
-
   def short_name
     name.split(" ").first.downcase
   end

app/models/survey_item_response.rb

@@ -16,7 +16,7 @@ class SurveyItemResponse < ActiveRecord::Base
   has_one :measure, through: :survey_item
 
   scope :exclude_boston, lambda {
-                           where.not(school: District.boston.schools) if District.boston.present?
+    includes(school: :district).where.not("district.name": "Boston")
                          }
 
   scope :averages_for_grade, lambda { |survey_items, school, academic_year, grade|