Class: ActiveSupport::Inflector::Inflections

### Home Classes Methods

### In Files

- lib/active_support/inflector/inflections.rb

### Parent

Object

### Methods

- ::instance
- ::new
- #clear
- #human
- #irregular
- #plural
- #singular
- #uncountable

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# ActiveSupport::Inflector::Inflections

A singleton instance of this class is yielded by Inflector.inflections, which can then be used to specify additional inflection rules. Examples:

    ActiveSupport::Inflector.inflections do |inflect|
      inflect.plural /^(ox)$/i, '\1\2en'
      inflect.singular /^(ox)en/i, '\1'

      inflect.irregular 'octopus', 'octopi'

      inflect.uncountable "equipment"
    end

New rules are added at the top. So in the example above, the irregular rule for octopus will now be the first of the pluralization and singularization rules that is runs. This guarantees that your rules run before any of the rules that may already have been loaded.

### Attributes

humans[R]
plurals[R]
singulars[R]
uncountables[R]

### Public Class Methods

instance() click to toggle source

    # File lib/active_support/inflector/inflections.rb, line 19
    def self.instance
      @__instance__ ||= new
    end

new() click to toggle source

    # File lib/active_support/inflector/inflections.rb, line 25
    def initialize
      @plurals, @singulars, @uncountables, @humans = [], [], [], []
    end

### Public Instance Methods

clear(scope = :all) click to toggle source

Clears the loaded inflections within a given scope (default is `:all`). Give the scope as a symbol of the inflection type, the options are: `:plurals`, `:singulars`, `:uncountables`, `:humans`.

Examples:

    clear :all
    clear :plurals

    # File lib/active_support/inflector/inflections.rb, line 96
    def clear(scope = :all)
      case scope
        when :all
          @plurals, @singulars, @uncountables = [], [], []
        else
          instance_variable_set "@#{scope}", []
      end
    end

human(rule, replacement) click to toggle source

Specifies a humanized form of a string by a regular expression rule or by a string mapping. When using a regular expression based replacement, the normal humanize formatting is called after the replacement. When a string is used, the human form should be specified as desired (example: ‘The name’, not ‘the_name’)

Examples:

    human /_cnt$/i, '\1_count'
    human "legacy_col_person_name", "Name"

    # File lib/active_support/inflector/inflections.rb, line 85
    def human(rule, replacement)
      @humans.insert(0, [rule, replacement])
    end

irregular(singular, plural) click to toggle source

Specifies a new irregular that applies to both pluralization and singularization at the same time. This can only be used for strings, not regular expressions. You simply pass the irregular in singular and plural form.

Examples:

    irregular 'octopus', 'octopi'
    irregular 'person', 'people'

    # File lib/active_support/inflector/inflections.rb, line 51
    def irregular(singular, plural)
      @uncountables.delete(singular)
      @uncountables.delete(plural)
      if singular[0,1].upcase == plural[0,1].upcase
        plural(Regexp.new("(#{singular[0,1]})#{singular[1..-1]}$", "i"), '\1' + plural[1..-1])
        plural(Regexp.new("(#{plural[0,1]})#{plural[1..-1]}$", "i"), '\1' + plural[1..-1])
        singular(Regexp.new("(#{plural[0,1]})#{plural[1..-1]}$", "i"), '\1' + singular[1..-1])
      else
        plural(Regexp.new("#{singular[0,1].upcase}(?i)#{singular[1..-1]}$"), plural[0,1].upcase + plural[1..-1])
        plural(Regexp.new("#{singular[0,1].downcase}(?i)#{singular[1..-1]}$"), plural[0,1].downcase + plural[1..-1])
        plural(Regexp.new("#{plural[0,1].upcase}(?i)#{plural[1..-1]}$"), plural[0,1].upcase + plural[1..-1])
        plural(Regexp.new("#{plural[0,1].downcase}(?i)#{plural[1..-1]}$"), plural[0,1].downcase + plural[1..-1])
        singular(Regexp.new("#{plural[0,1].upcase}(?i)#{plural[1..-1]}$"), singular[0,1].upcase + singular[1..-1])
        singular(Regexp.new("#{plural[0,1].downcase}(?i)#{plural[1..-1]}$"), singular[0,1].downcase + singular[1..-1])
      end
    end

plural(rule, replacement) click to toggle source

Specifies a new pluralization rule and its replacement. The rule can either be a string or a regular expression. The replacement should always be a string that may include references to the matched data from the rule.

    # File lib/active_support/inflector/inflections.rb, line 31
    def plural(rule, replacement)
      @uncountables.delete(rule) if rule.is_a?(String)
      @uncountables.delete(replacement)
      @plurals.insert(0, [rule, replacement])
    end

singular(rule, replacement) click to toggle source

Specifies a new singularization rule and its replacement. The rule can either be a string or a regular expression. The replacement should always be a string that may include references to the matched data from the rule.

    # File lib/active_support/inflector/inflections.rb, line 39
    def singular(rule, replacement)
      @uncountables.delete(rule) if rule.is_a?(String)
      @uncountables.delete(replacement)
      @singulars.insert(0, [rule, replacement])
    end

uncountable(*words) click to toggle source

Add uncountable words that shouldn’t be attempted inflected.

Examples:

    uncountable "money"
    uncountable "money", "information"
    uncountable %w( money information rice )

    # File lib/active_support/inflector/inflections.rb, line 74
    def uncountable(*words)
      (@uncountables << words).flatten!
    end

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