Method: Array#to_sentence

Defined in:
activesupport/lib/active_support/core_ext/array/conversions.rb

#to_sentence(options = {}) ⇒ Object

Converts the array to a comma-separated sentence where the last element is joined by the connector word.

You can pass the following options to change the default behavior. If you pass an option key that doesn’t exist in the list below, it will raise an ArgumentError.

Options

  • :words_connector - The sign or word used to join all but the last element in arrays with three or more elements (default: “, ”).

  • :last_word_connector - The sign or word used to join the last element in arrays with three or more elements (default: “, and ”).

  • :two_words_connector - The sign or word used to join the elements in arrays with two elements (default: “ and ”).

  • :locale - If i18n is available, you can set a locale and use the connector options defined on the ‘support.array’ namespace in the corresponding dictionary file.

Examples

[].to_sentence                      # => ""
['one'].to_sentence                 # => "one"
['one', 'two'].to_sentence          # => "one and two"
['one', 'two', 'three'].to_sentence # => "one, two, and three"

['one', 'two'].to_sentence(passing: 'invalid option')
# => ArgumentError: Unknown key: :passing. Valid keys are: :words_connector, :two_words_connector, :last_word_connector, :locale

['one', 'two'].to_sentence(two_words_connector: '-')
# => "one-two"

['one', 'two', 'three'].to_sentence(words_connector: ' or ', last_word_connector: ' or at least ')
# => "one or two or at least three"

Using :locale option:

# Given this locale dictionary:
#
#   es:
#     support:
#       array:
#         words_connector: " o "
#         two_words_connector: " y "
#         last_word_connector: " o al menos "

['uno', 'dos'].to_sentence(locale: :es)
# => "uno y dos"

['uno', 'dos', 'tres'].to_sentence(locale: :es)
# => "uno o dos o al menos tres"



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# File 'activesupport/lib/active_support/core_ext/array/conversions.rb', line 60

def to_sentence(options = {})
  options.assert_valid_keys(:words_connector, :two_words_connector, :last_word_connector, :locale)

  default_connectors = {
    words_connector: ", ",
    two_words_connector: " and ",
    last_word_connector: ", and "
  }
  if options[:locale] != false && defined?(I18n)
    i18n_connectors = I18n.translate(:'support.array', locale: options[:locale], default: {})
    default_connectors.merge!(i18n_connectors)
  end
  options = default_connectors.merge!(options)

  case length
  when 0
    +""
  when 1
    +"#{self[0]}"
  when 2
    +"#{self[0]}#{options[:two_words_connector]}#{self[1]}"
  else
    +"#{self[0...-1].join(options[:words_connector])}#{options[:last_word_connector]}#{self[-1]}"
  end
end