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update AS:OrderedHash docs

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Francesco Rodriguez 2012-05-16 14:44:57 -05:00
parent 3004bc2470
commit b1dfcc968b
1 changed files with 8 additions and 4 deletions
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12
activesupport/lib/active_support/ordered_hash.rb
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@ -5,16 +5,20 @@ YAML.add_builtin_type("omap") do |type, val|
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:
# <tt>ActiveSupport::OrderedHash</tt> implements a hash that preserves
# insertion order.
#
# 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.
# Also, maps the +omap+ feature for YAML files
# (See http://yaml.org/type/omap.html) to support ordered items
# when loading from yaml.
#
# <tt>ActiveSupport::OrderedHash</tt> is namespaced to prevent conflicts
# with other implementations.
class OrderedHash < ::Hash
def to_yaml_type
"!tag:yaml.org,2002:omap"