Purge all dossier with state draft

db/migrate/20161005144657_purge_draft_dossier.rb

@@ -0,0 +1,25 @@
+class PurgeDraftDossier < ActiveRecord::Migration
+  class Dossier < ActiveRecord::Base
+    BROUILLON = %w(draft)
+
+    def brouillon?
+      BROUILLON.include?(state)
+    end
+  end
+
+  class Commentaire < ActiveRecord::Base
+    belongs_to :dossier
+  end
+
+  class Cerfa < ActiveRecord::Base
+    belongs_to :dossier
+    belongs_to :user
+  end
+
+  def change
+    Cerfa.all.each { |cerfa| cerfa.delete if cerfa.dossier.brouillon? }
+    Commentaire.all.each { |com| com.delete if com.dossier.brouillon? }
+
+    Dossier.where(state: :draft).destroy_all
+  end
+end