method

index_by

v3.2.13 - Show latest stable - 0 notes - Class: Enumerable

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What's this?

index_by() public

Convert an enumerable to a hash. Examples:

people.index_by(&:login)
  => { "nextangle" => <Person ...>, "chade-" => <Person ...>, ...}
people.index_by { |person| "#{person.first_name} #{person.last_name}" }
  => { "Chade- Fowlersburg-e" => <Person ...>, "David Heinemeier Hansson" => <Person ...>, ...}

Show source

# File activesupport/lib/active_support/core_ext/enumerable.rb, line 94
  def index_by
    return to_enum :index_by unless block_given?
    Hash[map { |elem| [yield(elem), elem] }]
  end

index_by

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