statusable.rb

# Depende da gem exceptions-resource, só procurar no meu git que você encontra

module Statusable
  extend ActiveSupport::Concern

  included do
    available_statuses.each do |status|
      scope status, -> { where(status: status) }
    end
  end

  def status?(status)
    status.delete!('?')
    self.status == status
  end

  def change_status(status)
    if self.class.available_statuses.include? status
      update_attribute(:status, status)
    else
      fail I18n.t('exceptions.status.not_found')
    end
  end

  # vevify if is active, if not raise an exception
  def is_active?
    self.class.raise_model(:login, 'exceptions.auth.inactive') unless self.active?
    true
  end

  def is_status?(status)
    if status.last == '?'
      status = status.delete('?')
      self.class.available_statuses.include? status
    end
  end

  def is_change_status?(status)
    if status.last == '!'
      status = status.delete('!')
      self.class.available_statuses.include? status
    end
  end

  def method_missing(method, *args, &block)
    method_string = method.to_s
    if is_status? method_string
      self.status? method_string
    elsif is_change_status? method_string
      change_status(method_string.delete('!'))
    else
      super
    end
  end

  def respond_to?(method_sym, include_private = false)
    if is_status?(method_sym.to_s) || is_change_status?(method_sym.to_s)
      true
    else
      super
    end
  end

  module ClassMethods
    def available_statuses
      %w(active archived inative destroyed temporary) +
      %w(waiting aproved reproved answered closed) 
    end
  end
end