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Class: ActiveSupport::Inflector::Inflections

Relationships & Source Files
Inherits: Object
Defined in: activesupport/lib/active_support/inflector/inflections.rb

Overview

A singleton instance of this class is yielded by Inflector.inflections, which can then be used to specify additional inflection rules. If passed an optional locale, rules for other languages can be specified. The default locale is :en. Only rules for English are provided.

ActiveSupport::Inflector.inflections(:en) 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.

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Constructor Details

.new ⇒ Inflections

[ GitHub ] 

  


# File 'activesupport/lib/active_support/inflector/inflections.rb', line 36



def initialize
  @plurals, @singulars, @uncountables, @humans, @acronyms, @acronym_regex = [], [], [], [], {}, /(?=a)b/
end


  







Class Method Details



  

    .instance(locale = :en)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/inflector/inflections.rb', line 30



def self.instance(locale = :en)
  @__instance__[locale] ||= new
end


  







Instance Attribute Details



  

    #acronym_regex   (readonly)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/inflector/inflections.rb', line 34



attr_reader :plurals, :singulars, :uncountables, :humans, :acronyms, :acronym_regex


  








  

    #acronyms   (readonly)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/inflector/inflections.rb', line 34



attr_reader :plurals, :singulars, :uncountables, :humans, :acronyms, :acronym_regex


  








  

    #humans   (readonly)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/inflector/inflections.rb', line 34



attr_reader :plurals, :singulars, :uncountables, :humans, :acronyms, :acronym_regex


  








  

    #plurals   (readonly)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/inflector/inflections.rb', line 34



attr_reader :plurals, :singulars, :uncountables, :humans, :acronyms, :acronym_regex


  








  

    #singulars   (readonly)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/inflector/inflections.rb', line 34



attr_reader :plurals, :singulars, :uncountables, :humans, :acronyms, :acronym_regex


  








  

    #uncountables   (readonly)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/inflector/inflections.rb', line 34



attr_reader :plurals, :singulars, :uncountables, :humans, :acronyms, :acronym_regex


  







Instance Method Details



  

    #acronym(word)  
  



  

    

Specifies a new acronym. An acronym must be specified as it will appear in a camelized string. An underscore string that contains the acronym will retain the acronym when passed to ActiveSupport::Inflector#camelize, ActiveSupport::Inflector#humanize, or ActiveSupport::Inflector#titleize. A camelized string that contains the acronym will maintain the acronym when titleized or humanized, and will convert the acronym into a non-delimited single lowercase word when passed to ActiveSupport::Inflector#underscore.



acronym 'HTML'
titleize 'html'     # => 'HTML'
camelize 'html'     # => 'HTML'
underscore 'MyHTML' # => 'my_html'



The acronym, however, must occur as a delimited unit and not be part of another word for conversions to recognize it:



acronym 'HTTP'
camelize 'my_http_delimited' # => 'MyHTTPDelimited'
camelize 'https'             # => 'Https', not 'HTTPs'
underscore 'HTTPS'           # => 'http_s', not 'https'

acronym 'HTTPS'
camelize 'https'   # => 'HTTPS'
underscore 'HTTPS' # => 'https'



Note: Acronyms that are passed to ActiveSupport::Inflector#pluralize will no longer be recognized, since the acronym will not occur as a delimited unit in the pluralized result. To work around this, you must specify the pluralized form as an acronym as well:



acronym 'API'
camelize(pluralize('api')) # => 'Apis'

acronym 'APIs'
camelize(pluralize('api')) # => 'APIs'



acronym may be used to specify any word that contains an acronym or otherwise needs to maintain a non-standard capitalization. The only restriction is that the word must begin with a capital letter.



acronym 'RESTful'
underscore 'RESTful'           # => 'restful'
underscore 'RESTfulController' # => 'restful_controller'
titleize 'RESTfulController'   # => 'RESTful Controller'
camelize 'restful'             # => 'RESTful'
camelize 'restful_controller'  # => 'RESTfulController'

acronym 'McDonald'
underscore 'McDonald' # => 'mcdonald'
camelize 'mcdonald'   # => 'McDonald'


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/inflector/inflections.rb', line 96



def acronym(word)
  @acronyms[word.downcase] = word
  @acronym_regex = /#{@acronyms.values.join("|")}/
end


  








  

    #clear(scope = :all)  
  



  

    

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.



clear :all
clear :plurals


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/inflector/inflections.rb', line 185



def clear(scope = :all)
  case scope
    when :all
      @plurals, @singulars, @uncountables, @humans = [], [], [], []
    else
      instance_variable_set "@#{scope}", []
  end
end


  








  

    #human(rule, replacement)  
  



  

    

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').



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


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/inflector/inflections.rb', line 174



def human(rule, replacement)
  @humans.prepend([rule, replacement])
end


  








  

    #irregular(singular, plural)  
  



  

    

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.



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


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/inflector/inflections.rb', line 128



def irregular(singular, plural)
  @uncountables.delete(singular)
  @uncountables.delete(plural)

  s0 = singular[0]
  srest = singular[1..-1]

  p0 = plural[0]
  prest = plural[1..-1]

  if s0.upcase == p0.upcase
    plural(/(#{s0})#{srest}$/i, '\1' + prest)
    plural(/(#{p0})#{prest}$/i, '\1' + prest)

    singular(/(#{s0})#{srest}$/i, '\1' + srest)
    singular(/(#{p0})#{prest}$/i, '\1' + srest)
  else
    plural(/#{s0.upcase}(?i)#{srest}$/,   p0.upcase   + prest)
    plural(/#{s0.downcase}(?i)#{srest}$/, p0.downcase + prest)
    plural(/#{p0.upcase}(?i)#{prest}$/,   p0.upcase   + prest)
    plural(/#{p0.downcase}(?i)#{prest}$/, p0.downcase + prest)

    singular(/#{s0.upcase}(?i)#{srest}$/,   s0.upcase   + srest)
    singular(/#{s0.downcase}(?i)#{srest}$/, s0.downcase + srest)
    singular(/#{p0.upcase}(?i)#{prest}$/,   s0.upcase   + srest)
    singular(/#{p0.downcase}(?i)#{prest}$/, s0.downcase + srest)
  end
end


  








  

    #plural(rule, replacement)  
  



  

    

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.


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/inflector/inflections.rb', line 105



def plural(rule, replacement)
  @uncountables.delete(rule) if rule.is_a?(String)
  @uncountables.delete(replacement)
  @plurals.prepend([rule, replacement])
end


  








  

    #singular(rule, replacement)  
  



  

    

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.


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/inflector/inflections.rb', line 115



def singular(rule, replacement)
  @uncountables.delete(rule) if rule.is_a?(String)
  @uncountables.delete(replacement)
  @singulars.prepend([rule, replacement])
end


  








  

    #uncountable(*words)  
  



  

    

Specifies words that are uncountable and should not be inflected.



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


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/inflector/inflections.rb', line 162



def uncountable(*words)
  @uncountables += words.flatten.map(&:downcase)
end