diff options
| -rw-r--r-- | activesupport/lib/active_support/ordered_hash.rb | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/activesupport/lib/active_support/ordered_hash.rb b/activesupport/lib/active_support/ordered_hash.rb index 8edd3960c7..1a3693f766 100644 --- a/activesupport/lib/active_support/ordered_hash.rb +++ b/activesupport/lib/active_support/ordered_hash.rb @@ -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" |