Customizing Default respond_with posted by José Valim @ Wed, 16 Feb 2011 08:14:47 +0000

The fact respond_with does not work with Rspec is rather an Rspec bug. Controller specs in Rspec mocks a lot of methods in the model in a way that is incompatible to how responders work. You should try opening another issue on Rspec’s tracker if one does not exist yet.