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Diffstat (limited to 'guides')
| -rw-r--r-- | guides/source/active_support_core_extensions.textile | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/guides/source/active_support_core_extensions.textile b/guides/source/active_support_core_extensions.textile index e2118e8f61..587f65529e 100644 --- a/guides/source/active_support_core_extensions.textile +++ b/guides/source/active_support_core_extensions.textile @@ -2579,6 +2579,13 @@ end There's also the bang variant +transform_keys!+ that applies the block operations to keys in the very receiver. +Besides that, one can use +deep_transform_keys+ and +deep_transform_keys!+ to perform the block operation on all the keys in the given hash and all the hashes nested into it. An example of the result is: + +<ruby> +{nil => nil, 1 => 1, :nested => {:a => 3, 5 => 5}}.deep_transform_keys{ |key| key.to_s.upcase } +# => {""=>nil, "1"=>1, "NESTED"=>{"A"=>3, "5"=>5}} +</ruby> + NOTE: Defined in +active_support/core_ext/hash/keys.rb+. h5. +stringify_keys+ and +stringify_keys!+ |