尝试将文件从 Flex 上传到 Rails 时出现异常(使用回形针) [英] Exception when trying to upload file from Flex to Rails (using paperclip)
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问题描述
我正在尝试使用以下代码(来自 Flex on Rails 书籍)将动态生成的文件从 Flex(PNG 图像)上传到 Ruby on Rails 服务器后端:
I'm trying to upload a Dynamically generated file from Flex (PNG image) to Ruby on Rails Server back end using the following code (from Flex on Rails book):
public function save():void
{
var bitmapData:BitmapData = new BitmapData(width, height);
bitmapData.draw(this);
var ba:ByteArray = (new PNGEncoder()).encode(bitmapData);
var fileRef:FileReference = new FileReference();
//TODO: Remove HardCoding of URL here
var request : URLRequest = new URLRequest("http://localhost:3000/doodles");
request.method = URLRequestMethod.POST;
var boundary : String = "----------Ij5GI3GI3ei4GI3ei4KM7GI3KM7KM7";
request.contentType = "multipart/form-data; boundary=" + boundary;
request.data =getMultiPartRequestData(boundary,'doodle','',ba);
loader.load(request);
}
和 getMultiPartRequestData 函数是:
and getMultiPartRequestData function is:
private function getMultiPartRequestData(boundary:String,
resourceName:String,
filename:String,
bytes:ByteArray):ByteArray {
Alert.show("haha");
var lf:String = "\r\n";
var part1:String = '--' + boundary + lf +
'Content-Disposition: form-data; name="Filename"' + lf + lf +
'{0}' + lf +
'--' + boundary + lf ;
if (_model.authenticityToken != "") {
part1 += 'Content-Disposition: form-data; name="authenticity_token";' + lf + lf +
'{2}' + lf +
'--' + boundary + lf ;
}
part1 += 'Content-Disposition: form-data; name="{1}[x]";' + lf + lf +
'{3}' + lf +
'--' + boundary + lf +
'Content-Disposition: form-data; name="{1}[y]";' + lf + lf +
'{4}' + lf +
'--' + boundary + lf +
'Content-Disposition: form-data; name="{1}[width]";' + lf + lf +
'{5}' + lf +
'--' + boundary + lf +
'Content-Disposition: form-data; name="{1}[height]"' + lf + lf +
'{6}' + lf +
'--' + boundary + lf +
'Content-Disposition: form-data; name="{1}[rotation]"' + lf + lf +
'{7}' + lf +
'--' + boundary + lf +
'Content-Disposition: form-data; name="{1}[day_id]"' + lf + lf +
'{8}' + lf +
'--' + boundary + lf +
'Content-Disposition: form-data; name="{1}[privacy]"' + lf + lf +
'{9}' + lf +
'--' + boundary + lf +
'Content-Disposition: form-data; name="{1}[canvas_height]"' + lf + lf +
'{10}' + lf +
'--' + boundary + lf +
'Content-Disposition: form-data; name="{1}[canvas_width]"' + lf + lf +
'{11}' + lf +
'--' + boundary + lf +
'Content-Disposition: form-data; name="commit"' + lf + lf +
'Create' + lf +
'--' + boundary + lf +
'Content-Disposition: form-data; name="{1}[photo]";' +
'filename="{0}"' + lf +
'Content-Type: application/octet-stream' + lf + lf
var part2:String = '--' + boundary + lf +
'Content-Disposition: form-data; name="Upload"' + lf + lf +
'Submit Query' + lf +
'--' + boundary + '--'
var result:ByteArray = new ByteArray();
// Filling in the parameters as per comment above
result.writeMultiByte(StringUtil.substitute(part1,
filename,
resourceName,
_model.authenticityToken,
_model.boundMinX,
_model.boundMinY,
Constants.DEFAULT_DOODLE_WIDTH,
Constants.MINIMUM_CANVAS_HEIGHT,
0,
_model.current_day.id,
privacyGroup.selectedValue.toString(),
FlexGlobals.topLevelApplication.height,
FlexGlobals.topLevelApplication.width), "ascii");
result.writeBytes(bytes,0,bytes.length);
result.writeMultiByte(part2, "ascii");
return result;
}
我收到以下异常:
TypeError (can't convert nil into String):
vendor/plugins/paperclip/lib/paperclip/iostream.rb:8:in `extname'
vendor/plugins/paperclip/lib/paperclip/iostream.rb:8:in `to_tempfile'
vendor/plugins/paperclip/lib/paperclip/attachment.rb:89:in `assign'
vendor/plugins/paperclip/lib/paperclip.rb:262:in `block in has_attached_file'
activerecord (2.3.5) lib/active_record/base.rb:2746:in `block in attributes='
activerecord (2.3.5) lib/active_record/base.rb:2742:in `each'
activerecord (2.3.5) lib/active_record/base.rb:2742:in `attributes='
activerecord (2.3.5) lib/active_record/base.rb:2438:in `initialize'
app/controllers/doodles_controller.rb:16:in `new'
app/controllers/doodles_controller.rb:16:in `create'
actionpack (2.3.5) lib/action_controller/base.rb:1331:in `perform_action'
actionpack (2.3.5) lib/action_controller/filters.rb:617:in `call_filters'
actionpack (2.3.5) lib/action_controller/filters.rb:610:in `perform_action_with_filters'
actionpack (2.3.5) lib/action_controller/benchmarking.rb:68:in `block in perform_action_with_benchmark'
activesupport (2.3.5) lib/active_support/core_ext/benchmark.rb:17:in `block in ms'
/Users/tammam56/.rvm/rubies/ruby-1.9.1-p378/lib/ruby/1.9.1/benchmark.rb:309:in `realtime'
activesupport (2.3.5) lib/active_support/core_ext/benchmark.rb:17:in `ms'
actionpack (2.3.5) lib/action_controller/benchmarking.rb:68:in `perform_action_with_benchmark'
actionpack (2.3.5) lib/action_controller/rescue.rb:160:in `perform_action_with_rescue'
actionpack (2.3.5) lib/action_controller/flash.rb:146:in `perform_action_with_flash'
vendor/plugins/newrelic_rpm/lib/new_relic/agent/instrumentation/controller_instrumentation.rb:253:in `block in perform_action_with_newrelic_trace'
vendor/plugins/newrelic_rpm/lib/new_relic/agent/method_tracer.rb:141:in `trace_execution_scoped'
vendor/plugins/newrelic_rpm/lib/new_relic/agent/instrumentation/controller_instrumentation.rb:246:in `perform_action_with_newrelic_trace'
actionpack (2.3.5) lib/action_controller/base.rb:532:in `process'
actionpack (2.3.5) lib/action_controller/filters.rb:606:in `process_with_filters'
actionpack (2.3.5) lib/action_controller/base.rb:391:in `process'
actionpack (2.3.5) lib/action_controller/base.rb:386:in `call'
actionpack (2.3.5) lib/action_controller/routing/route_set.rb:437:in `call'
actionpack (2.3.5) lib/action_controller/dispatcher.rb:87:in `dispatch'
actionpack (2.3.5) lib/action_controller/dispatcher.rb:121:in `_call'
actionpack (2.3.5) lib/action_controller/dispatcher.rb:130:in `block in build_middleware_stack'
activerecord (2.3.5) lib/active_record/query_cache.rb:29:in `call'
activerecord (2.3.5) lib/active_record/query_cache.rb:29:in `block in call'
activerecord (2.3.5) lib/active_record/connection_adapters/abstract/query_cache.rb:34:in `cache'
activerecord (2.3.5) lib/active_record/query_cache.rb:9:in `cache'
activerecord (2.3.5) lib/active_record/query_cache.rb:28:in `call'
activerecord (2.3.5) lib/active_record/connection_adapters/abstract/connection_pool.rb:361:in `call'
actionpack (2.3.5) lib/action_controller/string_coercion.rb:25:in `call'
rack (1.0.1) lib/rack/head.rb:9:in `call'
rack (1.0.1) lib/rack/methodoverride.rb:24:in `call'
actionpack (2.3.5) lib/action_controller/params_parser.rb:15:in `call'
actionpack (2.3.5) lib/action_controller/session/cookie_store.rb:93:in `call'
actionpack (2.3.5) lib/action_controller/failsafe.rb:26:in `call'
rack (1.0.1) lib/rack/lock.rb:11:in `block in call'
<internal:prelude>:8:in `synchronize'
rack (1.0.1) lib/rack/lock.rb:11:in `call'
actionpack (2.3.5) lib/action_controller/dispatcher.rb:114:in `block in call'
actionpack (2.3.5) lib/action_controller/reloader.rb:34:in `run'
actionpack (2.3.5) lib/action_controller/dispatcher.rb:108:in `call'
rails (2.3.5) lib/rails/rack/static.rb:31:in `call'
rack (1.0.1) lib/rack/urlmap.rb:46:in `block in call'
rack (1.0.1) lib/rack/urlmap.rb:40:in `each'
rack (1.0.1) lib/rack/urlmap.rb:40:in `call'
rails (2.3.5) lib/rails/rack/log_tailer.rb:17:in `call'
rack (1.0.1) lib/rack/content_length.rb:13:in `call'
rack (1.0.1) lib/rack/chunked.rb:15:in `call'
rack (1.0.1) lib/rack/handler/mongrel.rb:64:in `process'
mongrel (1.1.5) lib/mongrel.rb:159:in `block in process_client'
mongrel (1.1.5) lib/mongrel.rb:158:in `each'
mongrel (1.1.5) lib/mongrel.rb:158:in `process_client'
mongrel (1.1.5) lib/mongrel.rb:285:in `block (2 levels) in run'
当我查看请求数据时，我得到以下信息:
When I look into the request data I get the following:
Processing DoodlesController#create (for 127.0.0.1 at 2010-06-28 22:51:57) [POST]
Parameters: {"Filename"=>"doodle.png", "authenticity_token"=>"4UoCgzNbH1UccJbqV4P+R1mCuLk54fWTXxkZvVBin+I=", "doodle"=>{"x"=>"0", "y"=>"100", "width"=>"1024", "height"=>"768", "rotation"=>"0", "day_id"=>"16", "privacy"=>"meonly", "canvas_height"=>"1298", "canvas_width"=>"2560", "photo"=>#<File:/var/folders/RH/RHekFGKME9uDJbX4d4DG3E+++TI/-Tmp-/RackMultipart20100628-1685-1v2epqd-0>}, "commit"=>"Create"}
这与 HTML 请求数据非常相似(如果我使用 HTML 页面而不是 Flex):
Which is very similar to the HTML request data (if I use HTML page instead of Flex):
Processing DoodlesController#create (for 127.0.0.1 at 2010-06-28 21:55:23) [POST]
Parameters: {"authenticity_token"=>"4UoCgzNbH1UccJbqV4P+R1mCuLk54fWTXxkZvVBin+I=", "doodle"=>{"privacy"=>"myonly", "day_id"=>"1", "x"=>"10", "y"=>"10", "width"=>"1000", "height"=>"1000", "rotation"=>"0", "canvas_height"=>"1000", "canvas_width"=>"1000", "photo"=>#<File:/var/folders/RH/RHekFGKME9uDJbX4d4DG3E+++TI/-Tmp-/RackMultipart20100628-1685-1gnfm5q-0>}, "commit"=>"Create"}
哪个有效！
如果我输入(在 Mac 中)
and if I type (in Mac)
open /var/folders/RH/RHekFGKME9uDJbX4d4DG3E+++TI/-Tmp-/RackMultipart20100628-1685-1v2epqd-0
(对于临时文件)它会打开预期的 PNG 文件！！
(for the temp file) It opens the PNG file intended!!
关于如何使其工作有任何建议吗?
Any suggestions on how I can make this to work?
推荐答案
在拉我的头发很长一段时间之后.我意识到这个问题很愚蠢！
After pulling my hair for quite some time. I realized the problem was very silly!
我在 Paperclip 插件中放了一个调试代码(就在回溯指出错误的地方:
I put a debug code inside the Paperclip pluging (Right where the backtrace is stating error:
vendor/plugins/paperclip/lib/paperclip/iostream.rb:8:in `extname'
我注意到这样一行
name = respond_to?(:original_filename) ? original_filename : (respond_to?(:path) ? path : "stream")
在打印出一些调试变量后，我意识到 original_filename 是 nil，这不应该是上传到服务器的实际文件名，根据我的代码应该是 doodle.png.只是为了发现我在发送的数据中忘记了文件名"前的一个空格.所以我的代码:
After printing out some debug variables I realized that original_filename is nil which shouldn't be as it should be the actual file name uploaded to the server which is supposed to be doodle.png according to my code. Just to find out that I forgot one space before 'filename' in the data I was sending. So my code:
'Content-Disposition: form-data; name="{1}[photo]";' +
'filename="{0}"' + lf +
'Content-Type: application/octet-stream' + lf + lf
是错误的.这段代码:
'Content-Disposition: form-data; name="{1}[photo]"; ' + //note extra space added here
'filename="{0}"' + lf +
'Content-Type: application/octet-stream' + lf + lf
作品.就这样！
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