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48 lines
1.2 KiB
Ruby
48 lines
1.2 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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# DEPRECATED: <tt>ActiveSupport::OrderedHash</tt> implements a hash that preserves
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# insertion order.
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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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# Also, maps the +omap+ feature for YAML files
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# (See http://yaml.org/type/omap.html) to support ordered items
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# when loading from yaml.
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#
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# <tt>ActiveSupport::OrderedHash</tt> is namespaced to prevent conflicts
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# 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 select(*args, &block)
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dup.tap { |hash| hash.select!(*args, &block) }
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end
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def reject(*args, &block)
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dup.tap { |hash| hash.reject!(*args, &block) }
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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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