Today I committed migration support to the osx/active_record library (revision 1751).
This is done through the module OSX::ActiveRecordConnector,
it works like this (note that this is only for sqlite for now):
Instead of writing the code to connect to the db you would now use:
ActiveRecordConnector.connect_to_sqlite_in_application_support
# you can optionally pas some options:
# :always_migrate => true
# :log => true
This piece [...]