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