Refactoring: Agora o sistema se comporta bem com objetos excluidos

app/models/attachment.rb

@@ -18,10 +18,15 @@ require 'fileutils.rb'
 
 class Attachment < ActiveRecord::Base
 
-	belongs_to :course
-	generate_validations
+	# Plugins
 	acts_as_paranoid
 
+	# Associacoes
+	belongs_to :course
+
+	# Validacao
+	generate_validations
+
 	# Atributo virtual file
 	def file=(new_file)
 		@tmp_file = new_file