Missing region scope

app/models/region.rb

@@ -6,6 +6,11 @@ class Region < ApplicationRecord
   has_many :orgas, dependent: :destroy
 
   default_scope { order :name }
+  scope :region, (lambda do |region|
+    return if region.nil? || region == 'all' || region.to_i.zero?
+    temp = Region.find region
+    where region: [temp, temp.regions].flatten
+  end)
 
   def to_s
     name