当发送为"multipart/form-data“时，如何在Roda/Rack中按名称获取参数？

Question

我有一个Roda/Rack应用程序。在post处理程序中，这是我通过表单enctype="multipart/form-data"接收的数据图像--二进制数据--也可以通过它发送，这就是为什么它是multipart/form-data

我的代码：

  r.body.rewind
  body_params = r.body.read

并返回以下内容：

  body_params

  => 
  "------WebKitFormBoundary123ABC\r\nContent-Disposition: form-data; 
    name=\"utf8\"\r\n\r\n\xE2\x9C\x93\r\n------WebKitFormBoundary123ABC\r\nContent-Disposition: form-data; 
    name=\"authenticity_token\"\r\n\r\n7/Q00bPqz5dKz7ktrlFMpK5mRMO/T8vwyDu1opc/3sdizUvEZrg6ECFSGUnLD4QcX3PHgj68l6k3Z9HTQE9/Jg==\r\n------WebKitFormBoundary123ABC\r\nContent-Disposition: form-data; 
    name=\"model123[image_temp_url]\"\r\n\r\n\r\n------WebKitFormBoundary123ABC\r\nContent-Disposition: form-data; 
    name=\"model123[counterfoil_name]\"\r\n\r\nName:\r\n------WebKitFormBoundary123ABC\r\nContent-Disposition: form-data; 
    name=\"model123[counterfoil_email]\"\r\n\r\nEmail:\r\n------WebKitFormBoundary123ABC\r\nContent-Disposition: form-data; 
    name=\"model123[event_name]\"\r\n\r\ndasf\r\n------WebKitFormBoundary123ABC\r\nContent-Disposition: form-data; 
    name=\"model123[event_date]\"\r\n\r\nfda\r\n------WebKitFormBoundary123ABC\r\nContent-Disposition: form-data; 
    name=\"model123[description]\"\r\n\r\n              \r\n------WebKitFormBoundary123ABC\r\nContent-Disposition: form-data; 
    name=\"model123[text_color]\"\r\n\r\n#000\r\n------WebKitFormBoundary123ABC\r\nContent-Disposition: form-data; 
    name=\"model123[border_color]\"\r\n\r\n#cf2a27\r\n------WebKitFormBoundary123ABC\r\nContent-Disposition: form-data; 
    name=\"model123[paper_size]\"\r\n\r\nA4\r\n------WebKitFormBoundary123ABC\r\nContent-Disposition: form-data; 
    name=\"model123[font]\"\r\n\r\nArial\r\n------WebKitFormBoundary123ABC--\r\n"

现在，如何解析参数以便按名称检索它们，如body_params["model123"]["description"]

Answer 1

简单:只需使用request.params (或r.params)：

2.5.0 :001 > body_params = r.body.tap(&:rewind).read
 => "-----------------------------17731730531088932352830400330\r\nContent-Disposition: form-data;
     name=\"model123[description]\"\r\n\r\nThis is the description.\r\n-----------------------------17731730531088932352830400330\r\nContent-Disposition: form-data;
     name=\"model123[font]\"\r\n\r\nComic Sans\r\n-----------------------------17731730531088932352830400330--\r\n"
2.5.0 :002 > r.params
 => {"model123"=>{"description"=>"This is the description.", "font"=>"This is something else."}}
2.5.0 :003 > request.params["model123"]["description"]
 => "This is the description."

#params和#body方法实际上来自Rack::Request。这是可能的，因为Roda的请求对象，Roda::RodaRequest，inherits from it。