method

camelize

v7.1.3.2 - Show latest stable - 1 note - Class: ActiveSupport::Inflector

camelize(term, uppercase_first_letter = true) public

Converts strings to UpperCamelCase. If the uppercase_first_letter parameter is set to false, then produces lowerCamelCase.

Also converts ‘/’ to ‘::’ which is useful for converting paths to namespaces.

camelize('active_model')                # => "ActiveModel"
camelize('active_model', false)         # => "activeModel"
camelize('active_model/errors')         # => "ActiveModel::Errors"
camelize('active_model/errors', false)  # => "activeModel::Errors"

As a rule of thumb you can think of camelize as the inverse of #underscore, though there are cases where that does not hold:

camelize(underscore('SSLError'))        # => "SslError"

Show source

# File activesupport/lib/active_support/inflector/methods.rb, line 70
    def camelize(term, uppercase_first_letter = true)
      string = term.to_s
      # String#camelize takes a symbol (:upper or :lower), so here we also support :lower to keep the methods consistent.
      if !uppercase_first_letter || uppercase_first_letter == :lower
        string = string.sub(inflections.acronyms_camelize_regex) { |match| match.downcase! || match }
      elsif string.match?(/\A[a-z\d]*\z/)
        return inflections.acronyms[string]&.dup || string.capitalize
      else
        string = string.sub(/^[a-z\d]*/) { |match| inflections.acronyms[match] || match.capitalize! || match }
      end
      string.gsub!(/(?:_|(\/))([a-z\d]*)/) do
        word = $2
        substituted = inflections.acronyms[word] || word.capitalize! || word
        $1 ? "::#{substituted}" : substituted
      end
      string
    end

January 20, 2010

3 thanks

Reverse version of camelize

Reverse version of camelize is underscore

camelize

Related methods

Reverse version of camelize