相关疑难解决方法(0)

是否可以before_action在某些指定的方法之前调用一个,比如在rails中？

class Calculator
  before_action { raise Exception, "calculator is empty" if @numbers.nil? }, 
                 only: [:plus, :minus, :divide, :times]

  def push number
    @numbers ||= [] 
    @numbers << number
  end

  def plus
    # ... 
  end

  def minus
    # ... 
  end

  def divide
    # ... 
  end

  def times
    # ... 
  end

    # ... 
end