允许它们两者并在控制器中验证您的逻辑怎么样？

# When `param1` and `param2` are sent at the same time, 
  # a 400 - Invalid Request will be sent back to the client
  def hello
    hello_params = params.require(:key).permit(:param1, :param2)

    # Return 400 - Invalid Request if both params are present
    if hello_params[:param1] && hello_params[:param2]
      render json: { message: "Both param1 and param2 should not be sent together." }, status: 400
      return
    end

    render json: { message: "Hello, world!" }
  end

字符串

我会这样做。这将允许:params1，如果它存在于参数中，否则:param2。

def key_params
  required_params = params.require(:key)

  attribute = required_params.key?(:param1) ? :params1 : :params2

  required_params.permit(:other_params, attribute)
end

字符串