Multiplos semestres

db/migrate/036_semestres.rb

@@ -0,0 +1,19 @@
+class Semestres < ActiveRecord::Migration
+	def self.up
+		rename_column :courses, :period, :grade
+		add_column :courses, :period, :string
+		Course.find(:all).each do |c|
+			c.update_attribute(:period, "2008.1")
+		end
+
+		remove_index :courses, :short_name
+		add_index :courses, :short_name, :unique => false
+	end
+
+	def self.down
+		remove_column :courses, :period
+		rename_column :courses, :grade, :period
+		remove_index :courses, :short_name
+		add_index :courses, :short_name, :unique => true
+	end
+end