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Contents
require 'facets/core/hash/normalize_keys'
class Hash
# Converts all keys in the Hash to Strings, returning a new Hash.
# With a +filter+ parameter, limits conversion to only a certain selection of keys.
#
# foo = { :name=>'Gavin', :wife=>:Lisa }
# foo.stringify_keys #=> { "name"=>"Gavin", "wife"=>:Lisa }
# foo.inspect #=> { :name =>"Gavin", :wife=>:Lisa }
#
#--
# Adapted from Gavin Sinclair's #convert_keys.
#++
def stringify_keys( &filter )
if filter
normalize_keys{ |k| filter[k] ? k.to_s : nil }
else
normalize_keys{ |k| k.to_s }
end
end
alias_method(:keys_to_s, :stringify_keys)
# Synonym for Hash#stringify_keys, but modifies the receiver in place and returns it.
# With a +filter+ parameter, limits conversion to only a certain selection of keys.
#
# foo = { :name=>'Gavin', :wife=>:Lisa }
# foo.stringify_keys! #=> { "name"=>"Gavin", "wife"=>:Lisa }
# foo.inspect #=> { "name"=>"Gavin", "wife"=>:Lisa }
#
#--
# Adapted from Gavin Sinclair's #convert_keys.
#++
def stringify_keys!( &filter )
if filter
normalize_keys!{ |k| filter[k] ? k.to_s : nil }
else
normalize_keys!{ |k| k.to_s }
end
end
alias_method( :keys_to_s!, :stringify_keys!)
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TCHash < Test::Unit::TestCase
def test_keys_to_s
foo = { :a=>1, :b=>2 }
assert_equal( { "a"=>1, "b"=>2 }, foo.stringify_keys )
assert_equal( { :a =>1, :b=>2 }, foo )
end
def test_keys_to_s!
foo = { :a=>1, :b=>2 }
assert_equal( { "a"=>1, "b"=>2 }, foo.stringify_keys! )
assert_equal( { "a"=>1, "b"=>2 }, foo )
end
end
=end
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10 entries across 10 versions & 1 rubygems