Module ActiveSupport::CoreExtensions::Hash::Slice
In: vendor/rails/activesupport/lib/active_support/core_ext/hash/slice.rb

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:

  def search(criteria = {})
    assert_valid_keys(:mass, :velocity, :time)
  end

  search(options.slice(:mass, :velocity, :time))

Methods

slice   slice!  

Public Instance methods

Returns a new hash with only the given keys.

[Source]

    # File vendor/rails/activesupport/lib/active_support/core_ext/hash/slice.rb, line 16
16:         def slice(*keys)
17:           allowed = Set.new(respond_to?(:convert_key) ? keys.map { |key| convert_key(key) } : keys)
18:           reject { |key,| !allowed.include?(key) }
19:         end

Replaces the hash with only the given keys.

[Source]

    # File vendor/rails/activesupport/lib/active_support/core_ext/hash/slice.rb, line 22
22:         def slice!(*keys)
23:           replace(slice(*keys))
24:         end

[Validate]