Module: Platanus::Enum::ClassMethods

Defined in:
lib/platanus/enum.rb

Instance Method Summary collapse

Instance Method Details

#attr_enum(_target, _module, _options = {}) ⇒ Object 



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# File 'lib/platanus/enum.rb', line 47

def attr_enum(_target, _module, _options={})

  map = {}
  pname = _options.has_key?(:property_name) ? _options[:property_name] : (_target.to_s + '_str')

  # Extract module constants
  _module.constants.each { |cname| map[_module.const_get(cname)] = cname.to_s.downcase }

  # Add string getter
  self.send(:define_method, pname) do
    map.fetch(self.send(_target), '')
  end

  # Add string setter
  self.send(:define_method, pname + '=') do |value|
    map.each_pair do |k,v|
      if v == value
        self.send(_target.to_s + '=', k)
        return
      end
    end
    raise InvalidEnumName
  end

  # Retrieve singleton class to define new class methods
  klass = class << self; self; end

  # Add parse function
  klass.send(:define_method, 'parse_' + _target.to_s) do |value|
    value = value.to_s
    map.each_pair do |k,v|
      return k if v == value
    end
    return nil
  end

  # Add value validator (unless validation is disabled)
  self.validates _target, inclusion: { :in => map.keys } if _options.fetch(:validate, true)
end