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Class: ActiveSupport::Deprecation::DeprecatedConstantProxy

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, ::Module
Instance Chain:
self, ::Module, ::Module::Concerning
Inherits: Module
Defined in: activesupport/lib/active_support/deprecation/proxy_wrappers.rb

Overview

DeprecatedConstantProxy transforms a constant into a deprecated one. It takes the full names of an old (deprecated) constant and of a new constant (both in string form) and a deprecator. The deprecated constant now returns the value of the new one.

PLANETS = %w(mercury venus earth mars jupiter saturn uranus neptune pluto)

# (In a later update, the original implementation of `PLANETS` has been removed.)

PLANETS_POST_2006 = %w(mercury venus earth mars jupiter saturn uranus neptune)
PLANETS = ActiveSupport::Deprecation::DeprecatedConstantProxy.new("PLANETS", "PLANETS_POST_2006", ActiveSupport::Deprecation.new)

PLANETS.map { |planet| planet.capitalize }
# => DEPRECATION WARNING: PLANETS is deprecated! Use PLANETS_POST_2006 instead.
     (Backtrace information…)
     ["Mercury", "Venus", "Earth", "Mars", "Jupiter", "Saturn", "Uranus", "Neptune"]

Constant Summary

::Module - Inherited

DelegationError

Class Attribute Summary

::Module - Inherited

.attr_internal_naming_format, .attr_internal_naming_format=

Class Method Summary

Instance Attribute Summary

::Module - Inherited

#anonymous?

A module may or may not have a name.

Instance Method Summary

::Module - Inherited

#alias_attribute

Allows you to make aliases for attributes, which includes getter, setter, and a predicate.
#attr_internal

Alias for Module#attr_internal_accessor.
#attr_internal_accessor

Declares an attribute reader and writer backed by an internally-named instance variable.
#attr_internal_reader

Declares an attribute reader backed by an internally-named instance variable.
#attr_internal_writer

Declares an attribute writer backed by an internally-named instance variable.
#cattr_accessor

Alias for Module#mattr_accessor.
#cattr_reader

Alias for Module#mattr_reader.
#cattr_writer

Alias for Module#mattr_writer.
#deep_dup

Returns a copy of module or class if it’s anonymous.
#delegate

Provides a delegate class method to easily expose contained objects’ public methods as your own.
#delegate_missing_to

When building decorators, a common pattern may emerge:
#deprecate

deprecate :foo, deprecator: MyLib.deprecator
#mattr_accessor

Defines both class and instance accessors for class attributes.
#mattr_reader

Defines a class attribute and creates a class and instance reader methods.
#mattr_writer

Defines a class attribute and creates a class and instance writer methods to allow assignment to the attribute.
#module_parent

Returns the module which contains this one according to its name.
#module_parent_name

Returns the name of the module containing this one.
#module_parents

Returns all the parents of this module according to its name, ordered from nested outwards.
#redefine_method

Replaces the existing method definition, if there is one, with the passed block as its body.
#redefine_singleton_method

Replaces the existing singleton method definition, if there is one, with the passed block as its body.
#remove_possible_method

Removes the named method, if it exists.
#remove_possible_singleton_method

Removes the named singleton method, if it exists.
#silence_redefinition_of_method

Marks the named method as intended to be redefined, if it exists.
#thread_cattr_accessor

Alias for Module#thread_mattr_accessor.
#thread_cattr_reader

Alias for Module#thread_mattr_reader.
#thread_cattr_writer

Alias for Module#thread_mattr_writer.
#thread_mattr_accessor

Defines both class and instance accessors for class attributes.
#attr_internal_define, #as_json, #method_visibility,
#thread_mattr_reader

Defines a per-thread class attribute and creates class and instance reader methods.
#thread_mattr_writer

Defines a per-thread class attribute and creates a class and instance writer methods to allow assignment to the attribute.

::Module::Concerning - Included

#concern

A low-cruft shortcut to define a concern.
#concerning

Define a new concern and mix it in.

Constructor Details

.new(*args, **options, &block) ⇒ DeprecatedConstantProxy

[ GitHub ] 

  


# File 'activesupport/lib/active_support/deprecation/proxy_wrappers.rb', line 123



def self.new(*args, **options, &block)
  object = args.first

  return object unless object
  super
end


  






  

  

    #initialize(old_const, new_const, deprecator = nil, message: "#{old_const} is deprecated! Use #{new_const} instead.")  ⇒ DeprecatedConstantProxy 
  



  

    
  





  


  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/deprecation/proxy_wrappers.rb', line 130



def initialize(old_const, new_const, deprecator = nil, message: "#{old_const} is deprecated! Use #{new_const} instead.")
  Kernel.require "active_support/inflector/methods"

  @old_const = old_const
  @new_const = new_const
  ActiveSupport.deprecator.warn("DeprecatedConstantProxy without a deprecator is deprecated") unless deprecator
  @deprecator = deprecator || ActiveSupport::Deprecation._instance
  @message = message
end


  







Dynamic Method Handling

  

    This class handles dynamic methods through the method_missing method




  

    #method_missing   (private)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/deprecation/proxy_wrappers.rb', line 186



def method_missing(...)
  @deprecator.warn(@message, caller_locations)
  target.__send__(...)
end


  







Instance Attribute Details



  

    #hash   (readonly)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/deprecation/proxy_wrappers.rb', line 150



delegate :hash, :instance_methods, :name, :respond_to?, to: :target


  








  

    #instance_methods   (readonly)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/deprecation/proxy_wrappers.rb', line 150



delegate :hash, :instance_methods, :name, :respond_to?, to: :target


  








  

    #name   (readonly)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/deprecation/proxy_wrappers.rb', line 150



delegate :hash, :instance_methods, :name, :respond_to?, to: :target


  







Instance Method Details



  

    #append_features(base)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/deprecation/proxy_wrappers.rb', line 161



def append_features(base)
  @deprecator.warn(@message, caller_locations)
  base.include(target)
end


  








  

    #class  
  



  

    

Returns the class of the new constant.



PLANETS_POST_2006 = %w(mercury venus earth mars jupiter saturn uranus neptune)
PLANETS = ActiveSupport::Deprecation::DeprecatedConstantProxy.new('PLANETS', 'PLANETS_POST_2006')
PLANETS.class # => Array


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/deprecation/proxy_wrappers.rb', line 157



def class
  target.class
end


  








  

    #const_missing(name)   (private)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/deprecation/proxy_wrappers.rb', line 181



def const_missing(name)
  @deprecator.warn(@message, caller_locations)
  target.const_get(name)
end


  








  

    #extended(base)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/deprecation/proxy_wrappers.rb', line 171



def extended(base)
  @deprecator.warn(@message, caller_locations)
  base.extend(target)
end


  








  

    #inspect  
  



  

    

Don’t give a deprecation warning on inspect since test/unit and error logs rely on it for diagnostics.


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/deprecation/proxy_wrappers.rb', line 144



def inspect
  target.inspect
end


  








  

    #prepend_features(base)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/deprecation/proxy_wrappers.rb', line 166



def prepend_features(base)
  @deprecator.warn(@message, caller_locations)
  base.prepend(target)
end


  








  

    #respond_to?  ⇒ Boolean 
  



  

    
  





  


  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/deprecation/proxy_wrappers.rb', line 150



delegate :hash, :instance_methods, :name, :respond_to?, to: :target


  








  

    #target   (private)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/deprecation/proxy_wrappers.rb', line 177



def target
  ActiveSupport::Inflector.constantize(@new_const.to_s)
end