--- sqlite_adapter.rb	2008-04-22 13:29:35.000000000 -0500
+++ /tmp/sqlite_adapter.rb	2008-05-14 12:49:36.000000000 -0500
@@ -214,6 +214,8 @@
       end
 
       def add_column(table_name, column_name, type, options = {}) #:nodoc:
+        raise StatementInvalid, 'Cannot add columns to a SQLite database while inside a transaction' if 
+          ActiveRecord::Base.connection.instance_variable_get(:@connection).transaction_active?
         super(table_name, column_name, type, options)
         # See last paragraph on http://www.sqlite.org/lang_altertable.html
         execute "VACUUM"