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Added Hash#except which is the inverse of Hash#slice -- return the ha…
…sh except the keys that are specified [DHH]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7172 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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dhh committed Jul 9, 2007
1 parent 5b2be62 commit cb2381696029ad839ecddad08afea061d07685fb
@@ -1,5 +1,7 @@
*SVN*

* Added Hash#except which is the inverse of Hash#slice -- return the hash except the keys that are specified [DHH]

* Added support for pluralization with a different starting letter than the singular version (cow/kine) #4929 [norri_b/hasmanyjosh]

* Demote Hash#to_xml to use XmlSimple#xml_in_string so it can't read files or stdin. #8453 [candlerb, Jeremy Kemper]
@@ -1,4 +1,4 @@
%w(keys indifferent_access reverse_merge conversions diff slice).each do |ext|
%w(keys indifferent_access reverse_merge conversions diff slice except).each do |ext|
require "#{File.dirname(__FILE__)}/hash/#{ext}"
end

@@ -9,4 +9,5 @@ class Hash #:nodoc:
include ActiveSupport::CoreExtensions::Hash::Conversions
include ActiveSupport::CoreExtensions::Hash::Diff
include ActiveSupport::CoreExtensions::Hash::Slice
include ActiveSupport::CoreExtensions::Hash::Except
end
@@ -0,0 +1,24 @@
require 'set'

module ActiveSupport #:nodoc:
module CoreExtensions #:nodoc:
module Hash #:nodoc:
# Return a hash that includes everything but the given keys. This is useful for
# limiting a set of parameters to everything but a few known toggles:
#
# @person.update_attributes(params[:person].except(:admin))
module Except
# Returns a new hash without the given keys.
def except(*keys)
rejected = Set.new(respond_to?(:convert_key) ? keys.map { |key| convert_key(key) } : keys)
reject { |key,| rejected.include?(key) }
end

# Replaces the hash without only the given keys.
def except!(*keys)
replace(except(*keys))
end
end
end
end
end
@@ -277,6 +277,19 @@ def test_indifferent_slice
assert_equal expected, copy
end
end

def test_except
original = { :a => 'x', :b => 'y', :c => 10 }
expected = { :a => 'x', :b => 'y' }

# Should return a new hash with only the given keys.
assert_equal expected, original.except(:c)
assert_not_equal expected, original

# Should replace the hash with only the given keys.
assert_equal expected, original.except!(:c)
assert_equal expected, original
end
end

class IWriteMyOwnXML

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