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Added Hash#deep_dup function which performs deep duplication on given hash

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This commit is contained in:
Piotr Sarnacki 2010-10-28 19:43:21 +02:00
parent cfbe595831
commit 5071b727b4
3 changed files with 27 additions and 0 deletions
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1
activesupport/lib/active_support/core_ext/hash.rb
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@ -1,5 +1,6 @@
require 'active_support/core_ext/hash/conversions'
require 'active_support/core_ext/hash/deep_merge'
require 'active_support/core_ext/hash/deep_dup'
require 'active_support/core_ext/hash/diff'
require 'active_support/core_ext/hash/except'
require 'active_support/core_ext/hash/indifferent_access'

11
activesupport/lib/active_support/core_ext/hash/deep_dup.rb Normal file
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@ -0,0 +1,11 @@
class Hash
# Returns a deep copy of hash.
def deep_dup
duplicate = self.dup
duplicate.each_pair do |k,v|
tv = duplicate[k]
duplicate[k] = tv.is_a?(Hash) && v.is_a?(Hash) ? tv.deep_dup : v
end
duplicate
end
end

15
activesupport/test/core_ext/hash_ext_test.rb
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@ -316,6 +316,21 @@ class HashExtTest < Test::Unit::TestCase
assert_equal expected, hash_1
end
def test_deep_dup
hash = { :a => { :b => 'b' } }
dup = hash.deep_dup
dup[:a][:c] = 'c'
assert_equal nil, hash[:a][:c]
assert_equal 'c', dup[:a][:c]
end
def test_deep_dup_initialize
zero_hash = Hash.new 0
hash = { :a => zero_hash }
dup = hash.deep_dup
assert_equal 0, dup[:a][44]
end
def test_store_on_indifferent_access
hash = HashWithIndifferentAccess.new
hash.store(:test1, 1)