feat: ECP-126 Add measure and scale level graphs for parents by language

WIP: refactor so multiple graphs can be defined for a given slug

WIP: fixed scale view but broke 'All Parent' graph

WIP: working state.  All views working properly

WIP: Refactor graph_map into two collections; measure_level_graphs and scale_level_graphs

WIP: refacter GroupedBarColumnPresenter to accept a 'construct' instead of specifying measure or scale

WIP: fix scale graphs being shown on incorrect view

WIP: Merge parents_by_language class with parents_by_language_by_scale so it can handle display of both measure-level and scale-level graphs

app/models/measure.rb

@@ -8,6 +8,10 @@ class Measure < ActiveRecord::Base
   has_many :survey_items, through: :scales
   has_many :survey_item_responses, through: :survey_items
 
+  def construct_id
+    measure_id
+  end
+
   def none_meet_threshold?(school:, academic_year:)
     @none_meet_threshold ||= Hash.new do |memo, (school, academic_year)|
       memo[[school, academic_year]] = !sufficient_survey_responses?(school:, academic_year:)

app/models/scale.rb

@@ -3,10 +3,19 @@
 class Scale < ApplicationRecord
   belongs_to :measure, counter_cache: true
   has_one :category, through: :measure
+  has_one :subcategory, through: :measure
   has_many :survey_items
   has_many :survey_item_responses, through: :survey_items
   has_many :admin_data_items
 
+  def construct_id
+    scale_id
+  end
+
+  def parent_survey_items
+    @parent_survey_items ||= survey_items.parent_survey_items
+  end
+
   def score(school:, academic_year:)
     @score ||= Hash.new do |memo, (school, academic_year)|
       memo[[school, academic_year]] = begin