# ri > ActiveSupport::DescendantsTracker

## [ActiveSupport::DescendantsTracker](https://www.chedong.com/phpMan.php/perldoc/ActiveSupport%3A%3ADescendantsTracker/markdown)

(from /home/chedong/.local/share/rdoc)
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This module provides an internal implementation to track descendants
which is faster than iterating through ObjectSpace.
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## Class methods:

  clear
  descendants
  direct_descendants
  store_inherited
  subclasses

## Instance methods:

  descendants
  direct_descendants
  inherited
  subclasses