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)

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

subclasses (klass)

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

Public Instance Methods

descendants ()

# 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 ()

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