class NameError
def missing_name
end
e.missing_name
rescue NameError => e
HelloWorld
begin
Extract the name of the missing constant from the exception message.
def missing_name # Since ruby v2.3.0 `did_you_mean` gem is loaded by default. # It extends NameError#message with spell corrections which are SLOW. # We should use original_message message instead. message = respond_to?(:original_message) ? original_message : self.message return unless message.start_with?("uninitialized constant ") receiver = begin self.receiver rescue ArgumentError nil end if receiver == Object name.to_s elsif receiver "#{real_mod_name(receiver)}::#{self.name}" else if match = message.match(/((::)?([A-Z]\w*)(::[A-Z]\w*)*)$/) match[1] end end end