V2.2: Inflector

Hanami includes an inflector that supports the pluralization, singularization and humanization of English words, as well as other transformations. This inflector is a Dry::Inflector instance.

Hanami uses the inflector internally for a variety of purposes, but it’s also available to use in your own code via the "inflector" component.

Configuring the inflector

To customize how particular words are inflected, use config.inflections in your app class.

# config/app.rb

require "hanami"

module Bookshelf
  class App < Hanami::App
    config.inflections do |inflections|
      inflections.acronym "DB", "XML", "NBA", "WNBA"
      inflections.uncountable("hanami")
    end
  end
end

A common reason for customization is to configure inflections to support desired class names and other constants. For example, the WNBA acronym above supports constants like Games::WNBA instead of Games::Wnba. See the autoloading guide for more detail.

Using the inflector in a component

Like "settings" and "logger", the inflector is available in your app and slice containers as an "inflector" component.

Use it in your own classes via the Deps mixin through include Deps["inflector"].

# app/my_component.rb

module Bookshelf
  class MyComponent
    include Deps["inflector"]

    def call
      inflector.pluralize("book")    # => "books"
      inflector.singularize("books") # => "book"

      inflector.camelize("dry/inflector") # => "Dry::Inflector"
      inflector.classify("books")         # => "Book"
      inflector.tableize("Book")          # => "books"

      inflector.dasherize("best_selling_books")  # => "best-selling-books"
      inflector.underscore("best-selling-books") # => "best_selling_books"

      inflector.demodulize("Bookshelf::MyComponent") # => "MyComponent"

      inflector.humanize("hanami_inflector") # => "Hanami inflector"
      inflector.humanize("author_id")        # => "Author"

      inflector.ordinalize(1)  # => "1st"
      inflector.ordinalize(2)  # => "2nd"
    end
  end
end

Replacing the inflector

If needed, you can replace the inflector by providing your own. Your replacement inflector should be another Dry::Inflector instance or provide the same interface.

# config/app.rb

require "hanami"
require "my_inflector"

module Bookshelf
  class App < Hanami::App
    config.inflector = MyInflector.new
  end
end