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

app/models/dashboard/category.rb

@@ -0,0 +1,13 @@
+module Dashboard
+  class Category < ApplicationRecord
+    include FriendlyId
+    friendly_id :name, use: [:slugged]
+
+    scope :sorted, -> { order(:category_id) }
+
+    has_many :subcategories
+    has_many :measures, through: :subcategories
+    has_many :admin_data_items, through: :measures
+    has_many :scales, through: :subcategories
+  end
+end