Question

I am building a project in rails 3.1, and I am having this message always printed when I do:

debug params

— !map:ActiveSupport::HashWithIndifferentAccess

Can any one please explain this error message ?? and why — !map ??

Answer 1

That isn’t an error message. The method debug converts the object you give it to YAML (a way of serializing objects to a string, not unlike XML or JSON) and prints it out. The --- !map is just part of the YAML format (see http://yaml.org/spec/1.2/spec.html) and ActiveSupport::HashWithIndifferentAccess is the class name of params.

Instead of using debug, do

p params

or

puts params.inspect

Both will show you nicer output.