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Maintain subclasses of Hash when calling Hash#slice #250

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Maintain subclasses of Hash when calling Hash#slice #250

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2 changes: 1 addition & 1 deletion lib/i18n/core_ext/hash.rb
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@@ -1,6 +1,6 @@
class Hash
def slice(*keep_keys)
h = {}
h = self.class.new
keep_keys.each { |key| h[key] = fetch(key) }
h
end unless Hash.method_defined?(:slice)
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6 changes: 6 additions & 0 deletions test/core_ext/hash_test.rb
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Expand Up @@ -14,6 +14,12 @@ class I18nCoreExtHashInterpolationTest < Test::Unit::TestCase
assert_equal expected, hash.slice(:foo)
end

test "#slice maintains subclasses of Hash" do
klass = Class.new(Hash)
hash = klass[:foo, 'bar', :baz, 'bar']
assert_instance_of klass, hash.slice(:foo)
end

test "#except" do
hash = { :foo => 'bar', :baz => 'bar' }
expected = { :foo => 'bar' }
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