method

slice

v3.0.0 - Show latest stable - 0 notes - Class: Hash

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What's this?

slice(*keys) public

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))

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))

Show source

# File activesupport/lib/active_support/core_ext/hash/slice.rb, line 15
  def slice(*keys)
    keys = keys.map! { |key| convert_key(key) } if respond_to?(:convert_key)
    hash = self.class.new
    keys.each { |k| hash[k] = self[k] if has_key?(k) }
    hash
  end

slice

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