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require 'yaml'
YAML.add_builtin_type("omap") do |type, val|
ActiveSupport::OrderedHash[val.map{ |v| v.to_a.first }]
end
module ActiveSupport
# The order of iteration over hashes in Ruby 1.8 is undefined. For example, you do not know the
# order in which +keys+ will return keys, or +each+ yield pairs. <tt>ActiveSupport::OrderedHash</tt>
# implements a hash that preserves insertion order, as in Ruby 1.9:
#
# oh = ActiveSupport::OrderedHash.new
# oh[:a] = 1
# oh[:b] = 2
# oh.keys # => [:a, :b], this order is guaranteed
#
# <tt>ActiveSupport::OrderedHash</tt> is namespaced to prevent conflicts with other implementations.
class OrderedHash < ::Hash
def to_yaml_type
"!tag:yaml.org,2002:omap"
end
def encode_with(coder)
coder.represent_seq '!omap', map { |k,v| { k => v } }
end
def nested_under_indifferent_access
self
end
# Returns true to make sure that this hash is extractable via <tt>Array#extract_options!</tt>
def extractable_options?
true
end
end
end
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