diff options
| -rw-r--r-- | activesupport/lib/active_support/core_ext/hash/slice.rb | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/activesupport/lib/active_support/core_ext/hash/slice.rb b/activesupport/lib/active_support/core_ext/hash/slice.rb index 8ad600b171..962655a6c1 100644 --- a/activesupport/lib/active_support/core_ext/hash/slice.rb +++ b/activesupport/lib/active_support/core_ext/hash/slice.rb @@ -1,6 +1,12 @@ class Hash - # Slice a hash to include only the given keys. This is useful for - # limiting an options hash to valid keys before passing to a method: + # Slice a hash to include only the given keys. Returns a hash containing + # the given keys. + # + # { a: 1, b: 2, c: 3, d: 4 }.slice(:a, :b) + # # => {:a=>1, :b=>2} + # + # This is useful for limiting an options hash to validate keys before + # passing to a method: # # def search(criteria = {}) # criteria.assert_valid_keys(:mass, :velocity, :time) |