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Module: ActiveSupport::DescendantsTracker

Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Extended In:
::AbstractController::Base, ActionCable::Engine, ::ActionController::API, ::ActionController::Base, ::ActionController::Metal, ActionController::Railtie, ActionDispatch::Railtie, ::ActionMailbox::Engine, ::ActionMailer::Base, ::ActionMailer::Preview, ActionMailer::Railtie, ::ActionText::Engine, ActionView::Railtie, ::ActionView::TestCase::TestController, ActiveJob::Railtie, ActiveModel::Railtie, ::ActiveRecord::Base, ActiveRecord::InternalMetadata, ActiveRecord::Railtie, ActiveRecord::SchemaMigration, ActiveStorage::Engine, ActiveSupport::Railtie, I18n::Railtie, ::Rails::Application, Rails::ApplicationController, ::Rails::Engine, Rails::InfoController, Rails::MailersController, ::Rails::Railtie, ::Rails::TestUnitRailtie, Rails::WelcomeController
Defined in: activesupport/lib/active_support/descendants_tracker.rb

Overview

This module provides an internal implementation to track descendants which is faster than iterating through ObjectSpace.

Class Method Summary

Instance Method Summary

Class Method Details

.clear

[ GitHub ] 

  


# File 'activesupport/lib/active_support/descendants_tracker.rb', line 24



def clear
  if defined? ActiveSupport::Dependencies
    @@direct_descendants.each do |klass, descendants|
      if Dependencies.autoloaded?(klass)
        @@direct_descendants.delete(klass)
      else
        descendants.reject! { |v| Dependencies.autoloaded?(v) }
      end
    end
  else
    @@direct_descendants.clear
  end
end


  








  

    .descendants(klass)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/descendants_tracker.rb', line 18



def descendants(klass)
  arr = []
  accumulate_descendants(klass, arr)
  arr
end


  








  

    .direct_descendants(klass)  
    Also known as: .subclasses
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/descendants_tracker.rb', line 12



def direct_descendants(klass)
  descendants = @@direct_descendants[klass]
  descendants ? descendants.to_a : []
end


  








  

    .store_inherited(klass, descendant)  
  



  

    

This is the only method that is not thread safe, but is only ever called during the eager loading phase.


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/descendants_tracker.rb', line 40



def store_inherited(klass, descendant)
  (@@direct_descendants[klass] ||= DescendantsArray.new) << descendant
end


  








  

    .subclasses(klass)  
  



  

    

Alias for .direct_descendants.


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/descendants_tracker.rb', line 16



alias_method :subclasses, :direct_descendants


  







Instance Method Details



  

    #descendants  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/descendants_tracker.rb', line 65



def descendants
  DescendantsTracker.descendants(self)
end


  








  

    #direct_descendants  
    Also known as: #subclasses
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/descendants_tracker.rb', line 60



def direct_descendants
  DescendantsTracker.direct_descendants(self)
end


  








  

    #inherited(base)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/descendants_tracker.rb', line 55



def inherited(base)
  DescendantsTracker.store_inherited(self, base)
  super
end


  








  

    #subclasses  
  



  

    

Alias for #direct_descendants.


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/descendants_tracker.rb', line 63



alias_method :subclasses, :direct_descendants