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Module: Kernel

Class Method Summary

Instance Method Summary

Class Method Details

concern(topic, &module_definition) (mod_func)

A shortcut to define a toplevel concern, not within a module.

See ::Module::Concerning for more.

[ GitHub ] 

  


# File 'activesupport/lib/active_support/core_ext/kernel/concern.rb', line 11



def concern(topic, &module_definition)
  Object.concern topic, &module_definition
end


  








  

    enable_warnings   (mod_func)
  



  

    

Sets $VERBOSE to true for the duration of the block and back to its original value afterwards.


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/core_ext/kernel/reporting.rb', line 20



def enable_warnings
  with_warnings(true) { yield }
end


  








  

    silence_warnings   (mod_func)
  



  

    

Sets $VERBOSE to nil for the duration of the block and back to its original value afterwards.



silence_warnings do
  value = noisy_call # no warning voiced
end

noisy_call # warning voiced


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/core_ext/kernel/reporting.rb', line 14



def silence_warnings
  with_warnings(nil) { yield }
end


  








  

    suppress(*exception_classes)   (mod_func)
  



  

    

Blocks and ignores any exception passed as argument if raised within the block.



suppress(ZeroDivisionError) do
  1/0
  puts 'This code is NOT reached'
end

puts 'This code gets executed and nothing related to ZeroDivisionError was seen'


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/core_ext/kernel/reporting.rb', line 41



def suppress(*exception_classes)
  yield
rescue *exception_classes
end


  








  

    with_warnings(flag)   (mod_func)
  



  

    

Sets $VERBOSE for the duration of the block and back to its original value afterwards.


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/core_ext/kernel/reporting.rb', line 26



def with_warnings(flag)
  old_verbose, $VERBOSE = $VERBOSE, flag
  yield
ensure
  $VERBOSE = old_verbose
end


  







Instance Method Details



  

    class_eval(*args, &block)  
  



  

    

class_eval on an object acts like singleton_class.class_eval.


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/core_ext/kernel/singleton_class.rb', line 5



def class_eval(*args, &block)
  singleton_class.class_eval(*args, &block)
end