FileMaker is not supported by ActiveRecord (and such support would be difficult). Instead, check our Rfm.
Rfm brings your FileMaker data to Ruby with elegance and speed. Now your Ruby scripts and Rails applications can talk directly to your FileMaker server with a syntax that just feels right.
Rfm is a free, open source (MIT) object-oriented Ruby API that exposes all of FileMaker’s core capabilities to Ruby and Ruby on Rails with a Ruby-like interface.
See sixfriedrice.com/wp/products/rfm for more info.