Module: ActiveSupport::DescendantsTracker

Included in:
AbstractController::Base, ActiveModel::Observer, ActiveRecord::Base
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.

Constant Summary collapse

@@direct_descendants = 
Hash.new { |h, k| h[k] = [] }

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.clear ⇒ Object 



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

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

.descendants(klass) ⇒ Object 



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# File 'activesupport/lib/active_support/descendants_tracker.rb', line 11

def self.descendants(klass)
  @@direct_descendants[klass].inject([]) do |descendants, _klass|
    descendants << _klass
    descendants.concat _klass.descendants
  end
end

.direct_descendants(klass) ⇒ Object 



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# File 'activesupport/lib/active_support/descendants_tracker.rb', line 7

def self.direct_descendants(klass)
  @@direct_descendants[klass]
end

Instance Method Details

#descendants ⇒ Object 



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# File 'activesupport/lib/active_support/descendants_tracker.rb', line 41

def descendants
  DescendantsTracker.descendants(self)
end

#direct_descendants ⇒ Object 



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# File 'activesupport/lib/active_support/descendants_tracker.rb', line 37

def direct_descendants
  DescendantsTracker.direct_descendants(self)
end

#inherited(base) ⇒ Object 



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# File 'activesupport/lib/active_support/descendants_tracker.rb', line 32

def inherited(base)
  self.direct_descendants << base
  super
end