Unable to serialize as ActiveSupport::HashWithIndifferentAccess anymore

Question

For reasons that I\'m so far completely unable to decipher, I\'m no longer able to use ActiveSupport::HashWithIndifferentAccess anymore.

The relevant part of model l

Answer 1

1.9.2 normally includes Psych as the YAML library. However, libyaml is an external dependency, and 1.9.2 defaults to using Syck (the old library) if libyaml is not available when Ruby is compiled: link

The fact that Psych YAML-izes ActiveSupport::HashWithIndifferentAccess as a standard hash is an oustanding issue on Psych's Github. Seems to be fixed in 1.9.3 though.