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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.

Methods
D
S

Class Public methods

descendants(klass)

Source: show 

# File activesupport/lib/active_support/descendants_tracker.rb, line 106
def descendants(klass)
  klass.descendants
end

subclasses(klass)

Source: show 

# File activesupport/lib/active_support/descendants_tracker.rb, line 102
def subclasses(klass)
  klass.subclasses
end

Instance Public methods

descendants()

Source: show 

# File activesupport/lib/active_support/descendants_tracker.rb, line 111
def descendants
  subclasses = self.subclasses
  subclasses.concat(subclasses.flat_map(&:descendants))
end

subclasses()

Source: show 

# File activesupport/lib/active_support/descendants_tracker.rb, line 177
def subclasses
  DescendantsTracker.subclasses(self)
end