Details on Firebird Adapter (for Rails) page
"Now with integrated goodness! It looks like Rails 0.14.4 (Active
Record 1.13.1) has the Firebird Adapter and patches to work with
Firebird. Worked out the box for me with Firebird 1.5 Superserver.
Skip the patching directions but all the usage rules below still
apply."

http://wiki.rubyonrails.com/rails/pages/Firebird+Adapter
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developer flamerobin.org