ruby on rails - Encoding characters in restful resource path with ActiveResource -

i've created rest api existing system utilizing rails , attempting consume in external system via activeresource. unfortunately primary key of 1 of core tables arbitrary string defined user many non-url friendly characters have been used on years. we've ended keys such "cr 1400/2400 a-c", activeresource not encoding correctly restful url. deals spaces correctly, not encode forward slashes amongst other characters.

i able call find method primary key containing these forbidden characters such as:

p = project.find('cr 1400/2400 a-c') 

which result in url such as:

http://localhost:3000/projects/cr%201400%2f2400%20a-c.json

instead of:

http://localhost:3000/projects/cr%201400/2400%20a-c.json

i cannot change database schema though little bring me greater joy.

is there way tell activeresource encode additional characters, or intercept call encode them prior constructing url?

thanks in advance

neil