new migration

db/migrate/20130219171111_change_uploads_source_to_text.rb

@@ -0,0 +1,9 @@
+class ChangeUploadsSourceToText < ActiveRecord::Migration
+  def up
+    execute "alter table uploads alter column source type text"
+  end
+
+  def down
+    execute "alter table uploads alter column source type varchar(255)"
+  end
+end