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2.6.3 :003 > ApplicationController.respond_to? 'puts'
Traceback (most recent call last):
5: from ~/.rvm/rubies/ruby-2.6.3/bin/irb:23:in `<main>'
4: from ~/.rvm/rubies/ruby-2.6.3/bin/irb:23:in `load'
3: from ~/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/irb-1.0.0/exe/irb:11:in `<top (required)>'
2: from (irb):3
1: from (irb):3:in `rescue in irb_binding'
NameError (uninitialized constant ApplicationController)
2.6.3 :004 > ApplicationController.respond_to? 'between'
'between' то же самое, на ' ' то же самоеApplicationController взял себе за подопытного?RI
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.respond_to? проверяет класс, а не константуRG
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