Class: NilClass

Inherits:
Object show all
Defined in:
lib/active_support/whiny_nil.rb,
lib/active_support/core_ext/try.rb,
lib/active_support/core_ext/duplicable.rb,
lib/active_support/core_ext/object/blank.rb,
lib/active_support/json/encoders/nil_class.rb

Overview

:nodoc:

Constant Summary collapse

WHINERS = 
[::Array]
METHOD_CLASS_MAP = 
Hash.new
AS_JSON = 
ActiveSupport::JSON::Variable.new('null').freeze

Instance Method Summary collapse

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args, &block) ⇒ Object (private) 



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# File 'lib/active_support/whiny_nil.rb', line 45

def method_missing(method, *args, &block)
  # Ruby 1.9.2: disallow explicit coercion via method_missing.
  if method == :to_ary || method == :to_str
    super
  elsif klass = METHOD_CLASS_MAP[method]
    raise_nil_warning_for klass, method, caller
  else
    super
  end
end

Instance Method Details

#as_json(options = nil) ⇒ Object

:nodoc:



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# File 'lib/active_support/json/encoders/nil_class.rb', line 4

def as_json(options = nil) #:nodoc:
  AS_JSON
end

#blank? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_support/core_ext/object/blank.rb', line 41

def blank?
  true
end

#duplicable? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_support/core_ext/duplicable.rb', line 10

def duplicable?
  false
end

#id ⇒ Object

Raises a RuntimeError when you attempt to call id on nil.

Raises:

  • (RuntimeError) 


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# File 'lib/active_support/whiny_nil.rb', line 40

def id
  raise RuntimeError, "Called id for nil, which would mistakenly be 4 -- if you really wanted the id of nil, use object_id", caller
end

#try(*args) ⇒ Object 



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# File 'lib/active_support/core_ext/try.rb', line 33

def try(*args)
  nil
end