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.
77 lines
2.2 KiB
Ruby
77 lines
2.2 KiB
Ruby
require 'abstract_unit'
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require 'test/unit'
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require 'active_support'
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require 'active_support/core_ext/hash/slice'
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class DescendantsTrackerTest < Test::Unit::TestCase
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class Parent
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extend ActiveSupport::DescendantsTracker
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end
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class Child1 < Parent
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end
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class Child2 < Parent
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end
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class Grandchild1 < Child1
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end
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class Grandchild2 < Child1
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end
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ALL = [Parent, Child1, Child2, Grandchild1, Grandchild2]
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def test_descendants
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assert_equal [Child1, Grandchild1, Grandchild2, Child2], Parent.descendants
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assert_equal [Grandchild1, Grandchild2], Child1.descendants
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assert_equal [], Child2.descendants
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end
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def test_direct_descendants
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assert_equal [Child1, Child2], Parent.direct_descendants
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assert_equal [Grandchild1, Grandchild2], Child1.direct_descendants
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assert_equal [], Child2.direct_descendants
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end
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def test_clear_with_autoloaded_parent_children_and_granchildren
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mark_as_autoloaded(*ALL) do
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ActiveSupport::DescendantsTracker.clear
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ALL.each do |k|
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assert ActiveSupport::DescendantsTracker.descendants(k).empty?
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end
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end
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end
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def test_clear_with_autoloaded_children_and_granchildren
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mark_as_autoloaded Child1, Grandchild1, Grandchild2 do
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ActiveSupport::DescendantsTracker.clear
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assert_equal [Child2], Parent.descendants
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assert_equal [], Child2.descendants
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end
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end
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def test_clear_with_autoloaded_granchildren
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mark_as_autoloaded Grandchild1, Grandchild2 do
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ActiveSupport::DescendantsTracker.clear
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assert_equal [Child1, Child2], Parent.descendants
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assert_equal [], Child1.descendants
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assert_equal [], Child2.descendants
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end
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end
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protected
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def mark_as_autoloaded(*klasses)
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old_autoloaded = ActiveSupport::Dependencies.autoloaded_constants.dup
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ActiveSupport::Dependencies.autoloaded_constants = klasses.map(&:name)
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old_descendants = ActiveSupport::DescendantsTracker.class_eval("@@direct_descendants").dup
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old_descendants.each { |k, v| old_descendants[k] = v.dup }
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yield
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ensure
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ActiveSupport::Dependencies.autoloaded_constants = old_autoloaded
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ActiveSupport::DescendantsTracker.class_eval("@@direct_descendants").replace(old_descendants)
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end
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end |