diff options
Diffstat (limited to 'activesupport/lib/active_support/core_ext/hash/slice.rb')
| -rw-r--r-- | activesupport/lib/active_support/core_ext/hash/slice.rb | 28 |
1 files changed, 3 insertions, 25 deletions
diff --git a/activesupport/lib/active_support/core_ext/hash/slice.rb b/activesupport/lib/active_support/core_ext/hash/slice.rb index 2bd0a56ea4..3d0f8a1e62 100644 --- a/activesupport/lib/active_support/core_ext/hash/slice.rb +++ b/activesupport/lib/active_support/core_ext/hash/slice.rb @@ -1,34 +1,12 @@ # frozen_string_literal: true class Hash - # Slices 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 valid keys before - # passing to a method: - # - # def search(criteria = {}) - # criteria.assert_valid_keys(:mass, :velocity, :time) - # end - # - # search(options.slice(:mass, :velocity, :time)) - # - # If you have an array of keys you want to limit to, you should splat them: - # - # valid_keys = [:mass, :velocity, :time] - # search(options.slice(*valid_keys)) - def slice(*keys) - keys.each_with_object(Hash.new) { |k, hash| hash[k] = self[k] if has_key?(k) } - end unless method_defined?(:slice) - # Replaces the hash with only the given keys. # Returns a hash containing the removed key/value pairs. # - # { a: 1, b: 2, c: 3, d: 4 }.slice!(:a, :b) - # # => {:c=>3, :d=>4} + # hash = { a: 1, b: 2, c: 3, d: 4 } + # hash.slice!(:a, :b) # => {:c=>3, :d=>4} + # hash # => {:a=>1, :b=>2} def slice!(*keys) omit = slice(*self.keys - keys) hash = slice(*keys) |