ruby on rails - Hash does not contain 'try' method -

i noticing differences between hash object within ruby 1.8.7 , hash object within rails 3.0.10.

for example, within 1.8.7 irb, get:

1.8.7 :001 > {}.try(:method) nomethoderror: undefned method `try' {}:hash (irb):1``` 

however, 3.0.10 rails console, get:

1.8.7 :003 > {}.try(:method_x) nomethoderror: undefined method `method_x' {}:hash   (irb):3:in `try'   (irb):3 

this surprises me because under impression try defined in object ancestor of hash , try return nil instead of throwing nomethoderror.

what missing?

this surprises me because under impression try defined in object ancestor of hash , try return nil instead of throwing nomethoderror.

what missing?

your impression of class try defined in correct (object). missing file defined in. it's defined in activesupport library, not in ruby core library.

so, need

require 'active_support/core_ext/object/try' 

first.