相关疑难解决方法(0)

我在这段代码中遇到语法错误

render json: {
    "what" => "created", 
    "whatCreated" => "thing",
    "htmlOutput" => render_to_string (partial: "some_partial")
}

但是使用这段代码我不会:

render json: {
    "what" => "created", 
    "whatCreated" => "thing",
    "htmlOutput" => render_to_string(partial: "some_partial")
}

怎么来render_to_string打破我的rails应用程序后的那个空间？