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app/models/repertoire.rb

@@ -1,6 +1,6 @@
 class Repertoire < ApplicationRecord
-
-	has_many :sub_repertoires
+  default_scope :order => 'updated_at desc'
+  has_many :sub_repertoires, :dependent => :destroy, :order => "sub_repertoires.updated_at desc"
 
   has_many :tag_repertoires, through: :sub_repertoires
 end

app/models/sub_repertoire.rb

@@ -1,3 +1,5 @@
 class SubRepertoire < ApplicationRecord
-	has_many :tag_repertoires
+	belongs_to :repertoire
+	has_many :tag_repertoires, :dependent => :destroy, :order => "tag_repertoires.updated_at desc"
+
 end