尝试将文件从Flex上传到Rails（使用回形针）时出现异常 [英] Exception when trying to upload file from Flex to Rails (using paperclip)
本文介绍了尝试将文件从Flex上传到Rails（使用回形针）时出现异常的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我试图从Flex（PNG图像）上传一个动态生成的文件到Ruby on Rails Server后端，使用下面的代码（从Flex on Rails的书）：
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（）;
$ b $ // TODO：在这里删除URL的HardCoding
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）;
$ / code $ / pre
$ b $和getMultiPartRequestData函数是：
private function getMultiPartRequestData（boundary：String，
resourceName：String，
filename：String，
bytes：ByteArray）：ByteArray {
Alert.show（haha）;
var lf：String =\r\\\
;
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 +
' - '+ border + lf +
'Content- Disposition ：form-data; name ={1} [y];'+ lf + lf +
'{4}'+ lf +
' - '+ border + lf +
'Content- Disposition ：form-data; name ={1} [width];'+ lf + lf +
'{5}'+ lf +
' - '+ border + lf +
'Content- Disposition ：form-data;名称={1} [height]'+ lf + lf +
'{6}'+ lf +
' - '+ border + lf +
'内容处理：形式数据;名称={1} [rotation]'+ lf + lf +
'{7}'+ lf +
' - '+ border + lf +
'内容处理：形式数据;名称={1} [day_id]'+ lf + lf +
'{8}'+ lf +
' - '+ border + lf +
'内容处理：形式数据;名称={1} [privacy]+ lf + lf +
'{9}'+ lf +
' - '+ border + lf +
'内容处理：形式数据;名称={1} [canvas_height]'+ lf + lf +
'{10}'+ lf +
' - '+ border + lf +
'内容处理：形式数据; name ={1} [canvas_width]'+ lf + lf +
'{11}'+ lf +
' - '+ border + lf +
'内容处理：形式数据; 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 =' - '+ border + lf +
'Content-Disposition：form-data; name =Upload'+ lf + lf +
'提交查询'+ lf +
' - '+ boundary +' - '
var result：ByteArray = new ByteArray（）;
//根据上面的注释填写参数
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）;
返回结果;
}
我得到以下异常：
TypeError（无法将nil转换为String）：
vendor / plugins / paperclip / lib / paperclip / iostream.rb：8：在`extname'
vendor / plugins / paperclip / lib / paperclip / iostream.rb：8：在`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：在`attributes ='
activerecord（2.3.5）lib / active_record / base.rb：2438：在`initialize'中
app / controllers / doodles_controller.rb：16：在`new'
app / controllers / doodles_controller.rb ：16：在`create'
actionpack（2.3.5）lib / action_controller / base.rb：1331：在`perform_action'
action （2.3.5）lib / action_controller / filters.rb：617：在`call_filters'
actionpack（2.3.5）lib / action_controller / filters.rb：610：在`perform_action_with_filters'
actionpack 2.3.5）lib / action_controller / benchmarking.rb：68：在`block in perform_action_with_benchmark'
activesupport（2.3.5）lib / active_support / core_ext / benchmark.rb：17：在`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 /
actionpack（2.3.5）lib / action_controller / benchmarking.rb：68：在`perform_action_with_benchmark'
actionpack（2.3.5）lib / action_controller / rescue.rb：160：在`perform_action_with_rescue'
actionpack（2.3.5）lib / action_controller / flash.rb：146：在'perform_action_with_flash'
vendor / plugins / newrelic_rpm / lib / new_relic / agent / instrumentation / controller_instrumentation.rb：253：在`block in perform_action_with_newrelic_trac e'
vendor / plugins / newrelic_rpm / lib / new_relic / agent / method_tracer.rb：141：'trace_execution_scoped'
vendor / plugins / newrelic_rpm / lib / new_relic / agent / instrumentation / controller_instrumentation.rb： 246：在`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：在`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：调用'
actionpack（2.3.5）lib / action_controller / routing / route_set.rb：437：in`call'
actionpack（2.3.5）lib / action_controller / dispatcher.rb：87： （2.3.5）lib / action_controller / dispatcher.rb：121：在`_call'中
actionpack（2.3.5）lib / action_controller / dispatcher.rb：130：在`block in build_middleware_stack'
activerecord（2.3.5）lib / active_record / query_cache.rb：29：`call'
activerecord（2.3.5）lib / active_record / query_cache.rb：29：在`block in call'中
activerecord（2.3.5）lib / active_record / connection_adapters / abstract / query_cache.rb：34： '
activerecord（2.3.5）lib / active_record / query_cache.rb：9：'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：'call'
rack（1.0.1）lib / rack / methodoverride.rb：24：在`call'
actionpack（2.3.5）lib / action_controller / params_parser.rb：15：在`call'
actionpack（2.3.5）lib / action_controller / session / cookie_store.rb：93：`call'
actionpack（2.3.5）lib / action_controller / failsafe.rb：26：在`call'中
rack（1.0.1）lib / rack / lock.rb：11：在`block in call'中
< internal：prelude>：8：在'synchronize'
rack（1.0.1）lib / rack / lock.rb：11：在`call'
actionpack（2.3.5）lib / action_controller / dispatcher.rb：114：在`block in call'
actionpack（2.3.5）lib / action_controller / reloader.rb：34：在`run'
actionpack（2.3.5）lib / action_controller / dispatcher.rb：108：`call'
rails（2.3.5）lib / rails / rack / static.rb：31：在`call'中
rack（1.0.1）lib / rack / urlmap.rb：46：在`block in call'
rack（1.0.1）lib / rack / urlmap.rb：40：在`each'
rack（1.0.1）lib / rack / urlmap.rb：40：在`call'
rails（2.3.5）lib / rails / rack / log_tailer.rb：17：在`call'
rack（1.0.1）lib / rack / content_length.rb：13：在`call'
rack（1.0.1）lib / rack / chunked.rb：15：在`call'
rack（1.0.1）lib / rack / handler / mongrel.rb：64：在`process'
mongrel（1.1.5）lib / mongrel.rb：159：在`block in process_client'
mongrel（1.1.5）lib / mongrel.rb：158：在`each'
mongrel 1.1.5）lib / mongrel.rb：158：在`process_client'
mongrel（1.1.5）lib / mongrel.rb ：285：在块中（2级）运行'
当我查看请求数据I得到以下内容：
$ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ POST]
参数：{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 /
$ / $ / $ p $ /
这与HTML请求数据非常相似（如果我使用HTML页面而不是Flex）：
处理DoodlesController＃create（对于127.0.0.1在2010-06-28 21:55:23）[POST]
参数：{authenticity_token=>4UoCgzNbH1UccJbqV4P + R1mCuLk54fWT XxkZvVBin + I =，doodle=> {privacy=>myonly，day_id=>1，x=>10 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 }
其中有用！
我输入（在Mac中）
$ $ $ $ $ $打开/ var / folders / RH / RHekFGKME9uDJbX4d4DG3E +++ TI / -Tmp- / RackMultipart20100628- 1685-1v2epqd-0
（用于临时文件）打开PNG文件！ >
有关如何使这项工作有效的建议？拉我的头发很长一段时间。我意识到这个问题是非常愚蠢的！
我把一个调试代码放在Paperclip pluging里面（右边的backtrace表明错误：
vendor / plugins / paperclip / lib / paperclip / iostream.rb：8：在`extname'
我注意到这样一行
name = respond_to？（ ：original_filename）？original_filename：（respond_to？（：path）？path：stream）
After打印出一些调试变量我意识到original_filename是零这不应该是因为它应该是实际的文件名上传到服务器应该是我的代码应该是doodle.png只是为了找出我忘了一个空间所以我的代码：
'Content-Disposition：form-data; name = {1} [photo];'+
'filename ={0}'+ lf +
'Content-Typ e：application / octet-stream'+ lf + lf
是错误的。这段代码：
'Content-Disposition：form-data;名称= {1} [照片]; '+ //注意在这里添加了额外的空间
'filename ={0}'+ lf +
'Content-Type：application / octet-stream'+ lf + lf
作品。就是这样！
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);
}
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;
}
I get the following exception:
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'
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"}
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"}
Which Works!
and if I type (in Mac)
open /var/folders/RH/RHekFGKME9uDJbX4d4DG3E+++TI/-Tmp-/RackMultipart20100628-1685-1v2epqd-0
(for the temp file) It opens the PNG file intended!!
Any suggestions on how I can make this to work?
解决方案
After pulling my hair for quite some time. I realized the problem was very silly!
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'
and I noticed a line like this
name = respond_to?(:original_filename) ? original_filename : (respond_to?(:path) ? path : "stream")
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
is Wrong. This code:
'Content-Disposition: form-data; name="{1}[photo]"; ' + //note extra space added here
'filename="{0}"' + lf +
'Content-Type: application/octet-stream' + lf + lf
Works. That's it!
这篇关于尝试将文件从Flex上传到Rails（使用回形针）时出现异常的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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