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module ActiveSupport::DescendantsTracker

Active Support Descendants Tracker

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

However Ruby 3.1 provide a fast native +Class#subclasses+ method, so if you know your code won’t be executed on older rubies, including ActiveSupport::DescendantsTracker does not provide any benefit.

Public class methods

descendants(klass)

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Source code GitHub 
# File activesupport/lib/active_support/descendants_tracker.rb, line 104
def descendants(klass)
  klass.descendants
end

subclasses(klass)

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Source code GitHub 
# File activesupport/lib/active_support/descendants_tracker.rb, line 100
def subclasses(klass)
  klass.subclasses
end

Public instance methods

descendants()

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Source code GitHub 
# File activesupport/lib/active_support/descendants_tracker.rb, line 109
def descendants
  subclasses = DescendantsTracker.reject!(self.subclasses)
  subclasses.concat(subclasses.flat_map(&:descendants))
end

subclasses()

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Source code GitHub 
# File activesupport/lib/active_support/descendants_tracker.rb, line 175
def subclasses
  DescendantsTracker.subclasses(self)
end

Definition files