相关疑难解决方法(0)

我正在玩Rails 4.x beta并尝试使用carrierwave获取嵌套属性.不确定我正在做的是正确的方向.搜索后,最后查看导轨源和强参数,我发现了下面的注释.

# Note that if you use +permit+ in a key that points to a hash,
# it won't allow all the hash. You also need to specify which
# attributes inside the hash should be whitelisted.

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https://github.com/rails/rails/blob/master/actionpack/lib/action_controller/metal/strong_parameters.rb

所以它说你必须在has中指定每一个单独的属性,我尝试了以下内容:

帕拉姆的例子:

{"utf8"=>"?",
 "authenticity_token"=>"Tm54+v9DYdBtWJ7qPERWzdEBkWnDQfuAQrfT9UE8VD=",
 "screenshot"=>{
   "title"=>"afs",
   "assets_attributes"=>{
     "0"=>{
       "filename"=>#<ActionDispatch::Http::UploadedFile:0x00000004edbe40
                      @tempfile=#<File:/tmp/RackMultipart20130123-18328-navggd>,
                      @original_filename="EK000005.JPG",
                      @content_type="image/jpeg",
                      @headers="Content-Disposition: form-data; name=\"screenshot[assets_attributes][0][filename]\"; filename=\"EK000005.JPG\"\r\nContent-Type: image/jpeg\r\n">
     }
   }
 },
 "commit"=>"Create Screenshot"}

调节器

def screenshot_params
  params.require(:screenshot).permit(:title,
    :assets_attributes => [:filename => [:@tempfile,:@original_filename,:@content_type,:@headers] 

以上不是"工作"(它不触发载波)但是当我使用我发现的标准嵌套示例时,我不再收到错误(未经许可的参数:文件名):

def screenshot_params
  params.require(:screenshot).permit(:title, assets_attributes: :filename)

如果有人能提供帮助就会很棒.我无法找到嵌套了一个指向哈希的键的示例.