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a5dda97602
The former should be symmetric with ancestors and include all children. However, it should not include self since ancestors + descendants should not have duplicated. The latter is symmetric to superclass in the sense it only includes direct children. By adopting a convention, we expect to have less conflict with other frameworks, as Datamapper. For this moment, to ensure ActiveModel::Validations can be used with Datamapper, we should always call ActiveSupport::DescendantsTracker.descendants(self) internally instead of self.descendants avoiding conflicts.
43 lines
No EOL
1.1 KiB
Ruby
43 lines
No EOL
1.1 KiB
Ruby
require 'active_support/dependencies'
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module ActiveSupport
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# This module provides an internal implementation to track descendants
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# which is faster than iterating through ObjectSpace.
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module DescendantsTracker
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@@direct_descendants = Hash.new { |h, k| h[k] = [] }
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def self.direct_descendants(klass)
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@@direct_descendants[klass]
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end
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def self.descendants(klass)
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@@direct_descendants[klass].inject([]) do |descendants, klass|
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descendants << klass
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descendants.concat klass.descendants
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end
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end
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def self.clear
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@@direct_descendants.each do |klass, descendants|
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if ActiveSupport::Dependencies.autoloaded?(klass)
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@@direct_descendants.delete(klass)
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else
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descendants.reject! { |v| ActiveSupport::Dependencies.autoloaded?(v) }
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end
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end
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end
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def inherited(base)
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self.direct_descendants << base
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super
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end
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def direct_descendants
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DescendantsTracker.direct_descendants(self)
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end
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def descendants
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DescendantsTracker.descendants(self)
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end
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end
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end |