我已经构建了一个rails应用程序，它以层次结构的形式存储图像。类似于：Surveyor > Survey > SurveySeason > ... > Capture > Image
可以在层次结构中的各个级别对Capture进行排序。
今天，我的一位用户报告说，在其中一个层次结构级别工作时，出现了错误＆＃34;发生了（500），然后她注意到数据丢失：从数据库和文件系统中删除了特定SurveySeason（它的孩子们）的所有数据。
我最初的猜测是，她不小心点击SurveySeason的删除按钮，同时认为她正在删除一个Capture（她当时正在做的一项任务）。一个UI错误，如果你愿意的话。
为了确认这一点，我已经深入研究了日志文件，这引出了一些其他问题。
unicorn.stdout.log
<ip-address-No1> - - [17/Jun/2014 15:42:28] "GET /captures/7990?_pjax=%5Bdata-pjax-container%5D HTTP/1.0" 304 - 0.9869
<ip-address-No1> - - [17/Jun/2014 15:42:30] "DELETE /captures/7990 HTTP/1.0" 302 - 1.3208
<ip-address-No1> - - [17/Jun/2014 15:42:30] "GET /survey_seasons/46 HTTP/1.0" 304 - 0.2305
<ip-address-No1> - - [17/Jun/2014 15:42:32] "GET /application/treedata HTTP/1.0" 200 - 1.9542
<ip-address-No2> - - [17/Jun/2014 15:42:35] "GET /historic_captures/15345?_pjax=%5Bdata-pjax-container%5D HTTP/1.0" 200 - 0.6459
<ip-address-No1> - - [17/Jun/2014 15:42:37] "GET /captures/7996?_pjax=%5Bdata-pjax-container%5D HTTP/1.0" 200 - 1.0446
<ip-address-No2> - - [17/Jun/2014 15:42:40] "POST /historic_captures/move HTTP/1.0" 200 - 0.0733
<ip-address-No1> - - [17/Jun/2014 15:42:45] "GET /captures/7984?_pjax=%5Bdata-pjax-container%5D HTTP/1.0" 200 - 1.0281
<ip-address-No1> - - [17/Jun/2014 15:42:50] "GET /captures/7984?_pjax=%5Bdata-pjax-container%5D HTTP/1.0" 304 - 1.0118
----><ip-address-No1> - - [17/Jun/2014 15:42:58] "DELETE /500 HTTP/1.0" 500 643 7.9431
<ip-address-No2> - - [17/Jun/2014 15:42:59] "GET /historic_captures/15634?_pjax=%5Bdata-pjax-container%5D HTTP/1.0" 200 - 0.5702
<ip-address-No1> - - [17/Jun/2014 15:43:01] "GET /404 HTTP/1.0" 404 728 0.0110
<ip-address-No2> - - [17/Jun/2014 15:43:03] "POST /historic_captures/move HTTP/1.0" 200 - 0.0620
<ip-address-No1> - - [17/Jun/2014 15:43:11] "GET / HTTP/1.0" 200 - 2.9165
<ip-address-No1> - - [17/Jun/2014 15:43:11] "GET /application/treedata HTTP/1.0" 200 - 0.0133
<ip-address-No1> - - [17/Jun/2014 15:43:18] "GET /application/treedata?id=11&type=Surveyor HTTP/1.0" 304 - 0.0071
<ip-address-No1> - - [17/Jun/2014 15:43:20] "GET /application/treedata?id=40&type=Survey HTTP/1.0" 200 - 0.0111
<ip-address-No1> - - [17/Jun/2014 15:43:22] "GET /surveys/40?_pjax=%5Bdata-pjax-container%5D HTTP/1.0" 304 - 0.2521
<ip-address-No1> - - [17/Jun/2014 15:43:27] "GET /surveys/23?_pjax=%5Bdata-pjax-container%5D HTTP/1.0" 200 - 0.3092
<ip-address-No2> - - [17/Jun/2014 15:43:28] "GET /historic_captures/15634?_pjax=%5Bdata-pjax-container%5D HTTP/1.0" 200 - 0.6675
<ip-address-No1> - - [17/Jun/2014 15:43:28] "GET /application/treedata?id=23&type=Survey HTTP/1.0" 200 - 0.0126
<ip-address-No1> - - [17/Jun/2014 15:43:30] "GET /surveys/40?_pjax=%5Bdata-pjax-container%5D HTTP/1.0" 304 - 0.2498
<ip-address-No2> - - [17/Jun/2014 15:43:32] "GET /historic_captures/15344?_pjax=%5Bdata-pjax-container%5D HTTP/1.0" 200 - 0.6263
<ip-address-No2> - - [17/Jun/2014 15:43:35] "GET /historic_captures/15634?_pjax=%5Bdata-pjax-container%5D HTTP/1.0" 304 - 0.5708
<ip-address-No1> - - [17/Jun/2014 15:43:38] "GET /surveyors/11?_pjax=%5Bdata-pjax-container%5D HTTP/1.0" 304 - 0.3119
<ip-address-No1> - - [17/Jun/2014 15:43:39] "GET /surveys/40?_pjax=%5Bdata-pjax-container%5D HTTP/1.0" 304 - 0.2575
<ip-address-No1> - - [17/Jun/2014 15:43:47] "GET /surveyors/11?_pjax=%5Bdata-pjax-container%5D HTTP/1.0" 304 - 0.2543
--------><ip-address-No1> - - [17/Jun/2014 15:43:51] "DELETE /survey_seasons/46 HTTP/1.0" 302 - 193.3085
<ip-address-No1> - - [17/Jun/2014 15:43:52] "GET /surveys/40?_pjax=%5Bdata-pjax-container%5D HTTP/1.0" 304 - 0.3568
<ip-address-No1> - - [17/Jun/2014 15:43:54] "GET /surveys/23?_pjax=%5Bdata-pjax-container%5D HTTP/1.0" 304 - 0.2928
<ip-address-No1> - - [17/Jun/2014 15:43:56] "GET /surveyors/11?_pjax=%5Bdata-pjax-container%5D HTTP/1.0" 304 - 0.3733
<ip-address-No1> - - [17/Jun/2014 15:44:13] "GET /surveys/40?_pjax=%5Bdata-pjax-container%5D HTTP/1.0" 304 - 0.2504
<ip-address-No1> - - [17/Jun/2014 15:44:25] "GET /surveyors/11?_pjax=%5Bdata-pjax-container%5D HTTP/1.0" 304 - 0.4014
<ip-address-No1> - - [17/Jun/2014 15:44:29] "GET /surveys/40?_pjax=%5Bdata-pjax-container%5D HTTP/1.0" 304 - 0.2655
production.log
Started DELETE "/captures/7990" for <ip-address-No1> at 2014-06-17 15:42:28 -0700
Processing by CapturesController#destroy as HTML
Parameters: {"authenticity_token"=>"IonwCsBlvoFTY/GrY3srK5wtUZDi3UqEbLIXwi+spaU=", "id"=>"7990"}
Redirected to http://envi-mountain-0003.envi.uvic.ca/survey_seasons/46
Completed 302 Found in 1318.1ms (ActiveRecord: 18.8ms)
Started GET "/survey_seasons/46" for <ip-address-No1> at 2014-06-17 15:42:30 -0700
Processing by SurveySeasonsController#show as HTML
Parameters: {"id"=>"46"}
Completed 200 OK in 227.6ms (Views: 219.5ms | ActiveRecord: 1.3ms)
Started GET "/application/treedata" for <ip-address-No1> at 2014-06-17 15:42:30 -0700
Processing by ApplicationController#treedata as JSON
Completed 200 OK in 1950.9ms (Views: 902.7ms | ActiveRecord: 1048.0ms)
Started GET "/historic_captures/15345?_pjax=%5Bdata-pjax-container%5D" for <ip-address-No2> at 2014-06-17 15:42:34 -0700
Processing by HistoricCapturesController#show as HTML
Parameters: {"_pjax"=>"[data-pjax-container]", "id"=>"15345"}
Completed 200 OK in 619.9ms (Views: 293.4ms | ActiveRecord: 100.1ms)
Started GET "/captures/7996?_pjax=%5Bdata-pjax-container%5D" for <ip-address-No1> at 2014-06-17 15:42:36 -0700
Processing by CapturesController#show as HTML
Parameters: {"_pjax"=>"[data-pjax-container]", "id"=>"7996"}
Completed 200 OK in 1018.6ms (Views: 254.3ms | ActiveRecord: 227.5ms)
Started POST "/historic_captures/move" for <ip-address-No2> at 2014-06-17 15:42:40 -0700
Processing by HistoricCapturesController#move as */*
Parameters: {"id"=>"15345", "parent_id"=>"1772", "parent_type"=>"HistoricVisit"}
Completed 200 OK in 70.5ms (ActiveRecord: 11.9ms)
Started GET "/captures/7984?_pjax=%5Bdata-pjax-container%5D" for <ip-address-No1> at 2014-06-17 15:42:44 -0700
Processing by CapturesController#show as HTML
Parameters: {"_pjax"=>"[data-pjax-container]", "id"=>"7984"}
Completed 200 OK in 1003.3ms (Views: 242.6ms | ActiveRecord: 209.6ms)
Started GET "/captures/7984?_pjax=%5Bdata-pjax-container%5D" for <ip-address-No1> at 2014-06-17 15:42:49 -0700
Processing by CapturesController#show as HTML
Parameters: {"_pjax"=>"[data-pjax-container]", "id"=>"7984"}
Completed 200 OK in 986.3ms (Views: 240.3ms | ActiveRecord: 205.5ms)
---->Started DELETE "/captures/7984" for <ip-address-No1> at 2014-06-17 15:42:50 -0700
Processing by CapturesController#destroy as HTML
Parameters: {"authenticity_token"=>"IonwCsBlvoFTY/GrY3srK5wtUZDi3UqEbLIXwi+spaU=", "id"=>"7984"}
Completed 500 Internal Server Error in 7914.9ms
Sent mail to me@gmail.com (8.7ms)
NoMethodError (undefined method `filesystem_path' for nil:NilClass):
app/decorators/controllers/captures_controller_decorator.rb:52:in `destroy'
Started GET "/historic_captures/15634?_pjax=%5Bdata-pjax-container%5D" for <ip-address-No2> at 2014-06-17 15:42:58 -0700
Processing by HistoricCapturesController#show as HTML
Parameters: {"_pjax"=>"[data-pjax-container]", "id"=>"15634"}
Completed 200 OK in 545.5ms (Views: 239.0ms | ActiveRecord: 98.9ms)
Started GET "/captures/7984" for <ip-address-No1> at 2014-06-17 15:43:01 -0700
Processing by CapturesController#show as HTML
Parameters: {"id"=>"7984"}
Completed 404 Not Found in 6.0ms
ActiveRecord::RecordNotFound (Couldn't find Capture with id=7984):
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Started POST "/historic_captures/move" for <ip-address-No2> at 2014-06-17 15:43:03 -0700
Processing by HistoricCapturesController#move as */*
Parameters: {"id"=>"15345", "parent_id"=>"10", "parent_type"=>"SurveySeason"}
Completed 200 OK in 59.2ms (ActiveRecord: 12.0ms)
Started GET "/" for <ip-address-No1> at 2014-06-17 15:43:08 -0700
Processing by StaticPagesController#home as HTML
Parameters: {"layout"=>"app/views/layouts/application.html.erb"}
Completed 200 OK in 2912.3ms (Views: 467.7ms | ActiveRecord: 2444.4ms)
Started GET "/application/treedata" for <ip-address-No1> at 2014-06-17 15:43:11 -0700
Processing by ApplicationController#treedata as JSON
Completed 200 OK in 10.6ms (Views: 9.3ms | ActiveRecord: 1.1ms)
Started GET "/application/treedata?id=11&type=Surveyor" for <ip-address-No1> at 2014-06-17 15:43:18 -0700
Processing by ApplicationController#treedata as JSON
Parameters: {"id"=>"11", "type"=>"Surveyor"}
Completed 200 OK in 4.2ms (Views: 2.0ms | ActiveRecord: 0.7ms)
Started GET "/application/treedata?id=40&type=Survey" for <ip-address-No1> at 2014-06-17 15:43:20 -0700
Processing by ApplicationController#treedata as JSON
Parameters: {"id"=>"40", "type"=>"Survey"}
Completed 200 OK in 8.2ms (Views: 3.3ms | ActiveRecord: 3.4ms)
Started GET "/surveys/40?_pjax=%5Bdata-pjax-container%5D" for <ip-address-No1> at 2014-06-17 15:43:21 -0700
Processing by SurveysController#show as HTML
Parameters: {"_pjax"=>"[data-pjax-container]", "id"=>"40"}
Completed 200 OK in 227.6ms (Views: 219.8ms | ActiveRecord: 1.1ms)
Started GET "/surveys/23?_pjax=%5Bdata-pjax-container%5D" for <ip-address-No1> at 2014-06-17 15:43:27 -0700
Processing by SurveysController#show as HTML
Parameters: {"_pjax"=>"[data-pjax-container]", "id"=>"23"}
Completed 200 OK in 284.3ms (Views: 276.6ms | ActiveRecord: 1.2ms)
Started GET "/historic_captures/15634?_pjax=%5Bdata-pjax-container%5D" for <ip-address-No2> at 2014-06-17 15:43:27 -0700
Processing by HistoricCapturesController#show as HTML
Parameters: {"_pjax"=>"[data-pjax-container]", "id"=>"15634"}
Completed 200 OK in 641.7ms (Views: 234.2ms | ActiveRecord: 125.7ms)
Started GET "/application/treedata?id=23&type=Survey" for <ip-address-No1> at 2014-06-17 15:43:28 -0700
Processing by ApplicationController#treedata as JSON
Parameters: {"id"=>"23", "type"=>"Survey"}
Completed 200 OK in 10.0ms (Views: 3.5ms | ActiveRecord: 5.0ms)
Started GET "/surveys/40?_pjax=%5Bdata-pjax-container%5D" for <ip-address-No1> at 2014-06-17 15:43:29 -0700
Processing by SurveysController#show as HTML
Parameters: {"_pjax"=>"[data-pjax-container]", "id"=>"40"}
Completed 200 OK in 225.0ms (Views: 217.5ms | ActiveRecord: 1.1ms)
Started GET "/historic_captures/15344?_pjax=%5Bdata-pjax-container%5D" for <ip-address-No2> at 2014-06-17 15:43:31 -0700
Processing by HistoricCapturesController#show as HTML
Parameters: {"_pjax"=>"[data-pjax-container]", "id"=>"15344"}
Completed 200 OK in 601.2ms (Views: 234.7ms | ActiveRecord: 100.2ms)
Started GET "/historic_captures/15634?_pjax=%5Bdata-pjax-container%5D" for <ip-address-No2> at 2014-06-17 15:43:35 -0700
Processing by HistoricCapturesController#show as HTML
Parameters: {"_pjax"=>"[data-pjax-container]", "id"=>"15634"}
Completed 200 OK in 545.2ms (Views: 229.1ms | ActiveRecord: 99.9ms)
Started GET "/surveyors/11?_pjax=%5Bdata-pjax-container%5D" for <ip-address-No1> at 2014-06-17 15:43:37 -0700
Processing by SurveyorsController#show as HTML
Parameters: {"_pjax"=>"[data-pjax-container]", "id"=>"11"}
Completed 200 OK in 286.2ms (Views: 278.9ms | ActiveRecord: 0.6ms)
Started GET "/surveys/40?_pjax=%5Bdata-pjax-container%5D" for <ip-address-No1> at 2014-06-17 15:43:39 -0700
Processing by SurveysController#show as HTML
Parameters: {"_pjax"=>"[data-pjax-container]", "id"=>"40"}
Completed 200 OK in 232.7ms (Views: 225.3ms | ActiveRecord: 0.9ms)
Started GET "/surveyors/11?_pjax=%5Bdata-pjax-container%5D" for <ip-address-No1> at 2014-06-17 15:43:47 -0700
Processing by SurveyorsController#show as HTML
Parameters: {"_pjax"=>"[data-pjax-container]", "id"=>"11"}
Completed 200 OK in 228.9ms (Views: 221.0ms | ActiveRecord: 0.8ms)
Redirected to http://envi-mountain-0003.envi.uvic.ca/surveys/40
-------->Completed 302 Found in 193305.5ms (ActiveRecord: 11008.7ms)
Started GET "/surveys/40?_pjax=%5Bdata-pjax-container%5D" for <ip-address-No1> at 2014-06-17 15:43:52 -0700
Processing by SurveysController#show as HTML
Parameters: {"_pjax"=>"[data-pjax-container]", "id"=>"40"}
Completed 200 OK in 328.6ms (Views: 320.2ms | ActiveRecord: 1.2ms)
Started GET "/surveys/23?_pjax=%5Bdata-pjax-container%5D" for <ip-address-No1> at 2014-06-17 15:43:54 -0700
Processing by SurveysController#show as HTML
Parameters: {"_pjax"=>"[data-pjax-container]", "id"=>"23"}
Completed 200 OK in 268.4ms (Views: 261.0ms | ActiveRecord: 0.9ms)
Started GET "/surveyors/11?_pjax=%5Bdata-pjax-container%5D" for <ip-address-No1> at 2014-06-17 15:43:56 -0700
Processing by SurveyorsController#show as HTML
Parameters: {"_pjax"=>"[data-pjax-container]", "id"=>"11"}
Completed 200 OK in 347.9ms (Views: 339.6ms | ActiveRecord: 0.8ms)
Started GET "/surveys/40?_pjax=%5Bdata-pjax-container%5D" for <ip-address-No1> at 2014-06-17 15:44:13 -0700
Processing by SurveysController#show as HTML
Parameters: {"_pjax"=>"[data-pjax-container]", "id"=>"40"}
Completed 200 OK in 226.3ms (Views: 218.3ms | ActiveRecord: 1.2ms)
Started GET "/surveyors/11?_pjax=%5Bdata-pjax-container%5D" for <ip-address-No1> at 2014-06-17 15:44:25 -0700
Processing by SurveyorsController#show as HTML
Parameters: {"_pjax"=>"[data-pjax-container]", "id"=>"11"}
Completed 200 OK in 376.3ms (Views: 367.8ms | ActiveRecord: 0.7ms)
Started GET "/surveys/40?_pjax=%5Bdata-pjax-container%5D" for <ip-address-No1> at 2014-06-17 15:44:29 -0700
Processing by SurveysController#show as HTML
Parameters: {"_pjax"=>"[data-pjax-container]", "id"=>"40"}
Completed 200 OK in 240.8ms (Views: 232.5ms | ActiveRecord: 1.2ms)
注意：我已经用。
替换了有效的IP地址在这两个日志中，我都用箭头作为最相关的行前缀。
----＆GT;这似乎是在尝试删除捕获7984时发生500内部服务器错误的位置。在production.log中，相当清楚这是路由DELETE上的/captures/7984请求。在独角兽日志中，为什么这会显示为DELETE /500 HTTP/1.0 500？对我来说，这似乎是要求删除路径/500并返回500响应。
--------＆GT;这是SurveySeason被删除的地方。在unicorn日志中，很明显有人明确地向DELETE这个对象发送了请求。但是，在production.log上，我得到的是Completed 302 Found in 193305.5ms (ActiveRecord: 11008.7ms)。对我来说似乎很神秘。为什么会以不同方式报告这些事件的任何想法？
我希望能够深究这一点。