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

Methods
D
I
S

Class Public methods

descendants(klass)

Source: show | on GitHub 

# File activesupport/lib/active_support/descendants_tracker.rb, line 62
def descendants(klass)
  klass.descendants
end

direct_descendants(klass)

Source: show | on GitHub 

# File activesupport/lib/active_support/descendants_tracker.rb, line 11
      def direct_descendants(klass)
        ActiveSupport::Deprecation.warn(<<~MSG)
          ActiveSupport::DescendantsTracker.direct_descendants is deprecated and will be removed in Rails 7.1.
          Use ActiveSupport::DescendantsTracker.subclasses instead.
        MSG
        subclasses(klass)
      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.

Source: show | on GitHub 

# File activesupport/lib/active_support/descendants_tracker.rb, line 138
def store_inherited(klass, descendant)
  (@@direct_descendants[klass] ||= DescendantsArray.new) << descendant
end

subclasses(klass)

Source: show | on GitHub 

# File activesupport/lib/active_support/descendants_tracker.rb, line 58
def subclasses(klass)
  klass.subclasses
end

Instance Public methods

descendants()

Source: show | on GitHub 

# File activesupport/lib/active_support/descendants_tracker.rb, line 88
def descendants
  subclasses.concat(subclasses.flat_map(&:descendants))
end

direct_descendants()

Source: show | on GitHub 

# File activesupport/lib/active_support/descendants_tracker.rb, line 92
      def direct_descendants
        ActiveSupport::Deprecation.warn(<<~MSG)
          ActiveSupport::DescendantsTracker#direct_descendants is deprecated and will be removed in Rails 7.1.
          Use #subclasses instead.
        MSG
        subclasses
      end

inherited(base)

Source: show | on GitHub 

# File activesupport/lib/active_support/descendants_tracker.rb, line 153
def inherited(base)
  DescendantsTracker.store_inherited(self, base)
  super
end

subclasses()

Source: show | on GitHub 

# File activesupport/lib/active_support/descendants_tracker.rb, line 82
def subclasses
  subclasses = super
  subclasses.reject! { |d| @@excluded_descendants[d] }
  subclasses
end