Module: Kernel

Defined in:
activesupport/lib/active_support/core_ext/kernel/concern.rb,
activesupport/lib/active_support/core_ext/kernel/reporting.rb,
activesupport/lib/active_support/core_ext/kernel/singleton_class.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.concern(topic, &module_definition) ⇒ Object

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

See Module::Concerning for more.


9
10
11
# File 'activesupport/lib/active_support/core_ext/kernel/concern.rb', line 9

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

.enable_warningsObject

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


18
19
20
# File 'activesupport/lib/active_support/core_ext/kernel/reporting.rb', line 18

def enable_warnings
  with_warnings(true) { yield }
end

.silence_warningsObject

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

12
13
14
# File 'activesupport/lib/active_support/core_ext/kernel/reporting.rb', line 12

def silence_warnings
  with_warnings(nil) { yield }
end

.suppress(*exception_classes) ⇒ Object

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'

39
40
41
42
# File 'activesupport/lib/active_support/core_ext/kernel/reporting.rb', line 39

def suppress(*exception_classes)
  yield
rescue *exception_classes
end

.with_warnings(flag) ⇒ Object

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


24
25
26
27
28
29
# File 'activesupport/lib/active_support/core_ext/kernel/reporting.rb', line 24

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

Instance Method Details

#class_eval(*args, &block) ⇒ Object

class_eval on an object acts like singleton_class.class_eval.


3
4
5
# File 'activesupport/lib/active_support/core_ext/kernel/singleton_class.rb', line 3

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