Text is not a valid type this should make it work

Author: Allen Kerr

migrations/002_change_url_to_text.rb

@@ -1,7 +1,7 @@
 Sequel.migration do
   up do
     alter_table :links do
-      set_column_type :url, Text
+      set_column_type :url, String, :text => true
     end
   end