Rails respond_to 问题与 json答案

【问题标题】：Rails respond_to issue with jsonRails respond_to 问题与 json
【发布时间】：2012-07-12 03:55:29
【问题描述】：

我正在上传一些 HTML5，但遇到了一个我似乎无法弄清楚的问题。拿这个功能代码：

if @image.save
    render :json => {:status => "Successfully uploaded image!"}
else
    render :json => {:status => "Something went wrong with your upload!"}
end

这行得通，而且它完全按照它应该做的那样做。但是，当我添加 respond_to 来捕获 HTML 请求时，它完全失败了（尽管 HTML 部分有效。）

respond_to do |format|
    if @image.save
        format.html {redirect_to(edit_product_path(@image.product), :notice => "Your image was added successfully.")}
        format.json {render :status => "Successfully uploaded image!"}
    else
        format.html {redirect_to(edit_product_path(@image.product), :alert => "An error occurred while attempting to upload your image. Please try again.")}
        format.json {render :status => "Something went wrong with your upload!"}
    end 
end

有什么想法可能是错的吗？我觉得我忽略了一些简单的事情。谢谢。

编辑 - 问题已解决

我认为这是我一直忽略的一件愚蠢的事情。原来请求是 HTML，而不是 JSON，这是因为上传需要内容类型为 multipart/form-data，respond_to 触发了 HTML。

【问题讨论】：

Firebug 简单显示：JSON.parse: unexpected character return window.JSON.parse(data);

标签： ruby-on-rails ruby-on-rails-3 json

【解决方案1】：

渲染需要一个状态码，所以下面的代码不起作用

format.json {render :status => "Something went wrong with your upload!"}

你可以写成

format.json {render :error => "Something went wrong with your upload!", :status => :bad_request }

【讨论】：

【解决方案2】：

你需要将响应渲染成 json

# old
format.json {render :status => "Successfully uploaded image!"}

# new
format.json { render(:json => { :status => "Successfully uploaded image!" }) }

【讨论】：