method

sole

v7.1.3.2 - Show latest stable - 0 notes - Class: Enumerable

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What's this?

sole() public

Returns the sole item in the enumerable. If there are no items, or more than one item, raises +Enumerable::SoleItemExpectedError+.

["x"].sole          # => "x"
Set.new.sole        # => Enumerable::SoleItemExpectedError: no item found
{ a: 1, b: 2 }.sole # => Enumerable::SoleItemExpectedError: multiple items found

Show source

# File activesupport/lib/active_support/core_ext/enumerable.rb, line 206
  def sole
    case count
    when 1   then return first # rubocop:disable Style/RedundantReturn
    when 0   then raise ActiveSupport::EnumerableCoreExt::SoleItemExpectedError, "no item found"
    when 2.. then raise ActiveSupport::EnumerableCoreExt::SoleItemExpectedError, "multiple items found"
    end
  end

sole

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