javascript - 让异步工作</h1><span><a href="/alltag/">全部标签</a></span></div><div class="item"><h2><a href="/v/tkc0ht/">ruby-on-rails - 由于 "wkhtmltopdf"，PDFKIT 显然无法正常工作</a></h2><div class="post"> 我在从html页面生成PDF时遇到问题。我正在使用PDFkit。在安装它的过程中，我注意到我需要wkhtmltopdf。所以我也安装了它。我做了PDFkit的文档所说的一切......现在我在尝试加载PDF时遇到了这个错误。这里是错误:commandfailed:"/usr/local/bin/wkhtmltopdf""--margin-right""0.75in""--page-size""Letter""--margin-top""0.75in""--margin-bottom""0.75in""--encoding""UTF-8""--margin-left""0.75in""-</div><div class="tag"><a href="/t/ruby-on-rails/">ruby-on-rails</a><a href="/t/wkhtmltopdf/">wkhtmltopdf</a><a href="/t/34/">34</a><a href="/t/section/">section</a><a href="/t/margin/">margin</a><a href="/t/ruby/">ruby</a><a href="/t/pdfkit/">pdfkit</a></div></div><div class="item"><h2><a href="/v/arh1cp/">ruby-on-rails - 'compass watch' 是如何工作的/它是如何与 rails 一起使用的</a></h2><div class="post"> 我在我的项目目录中完成了compasscreate.和compassinitrails。几个问题:我已将我的.sass文件放在public/stylesheets中。这是放置它们的正确位置吗？当我运行compasswatch时，它不会自动编译这些.sass文件。我必须手动指定文件:compasswatchpublic/stylesheets/myfile.sass等。如何让它自动运行？文件ie.css、print.css和screen.css已放在stylesheets/compiled。如何在编译后不让它们重新出现的情况下删除它们？我自己编译的.sass文件编译成compiled/t</div><div class="tag"><a href="/t/rails/">rails</a><a href="/t/ruby-on-rails/">ruby-on-rails</a><a href="/t/code/">code</a><a href="/t/compass/">compass</a><a href="/t/stylesheets/">stylesheets</a><a href="/t/ruby/">ruby</a><a href="/t/sass/">sass</a><a href="/t/compass-sass/">compass-sass</a></div></div><div class="item"><h2><a href="/v/bs1kp7/">ruby-on-rails - 如何从 format.xml 中删除 <hash></hash></a></h2><div class="post"> 我有一个对象has_many应呈现为xml的子对象。这不是问题。我的问题是我创建了一个Hash包含此数据，就像解析器需要它一样。但是rails自动将整个文件包含在.........我需要摆脱type="array"和我该如何处理？我没有在文档中找到任何内容。最佳答案我遇到了同样的问题；这是我的XML:我在用这个:entries.to_xml将散列数据转换为XML，但这会将条目的数据包装到中所以我修改了:entries.to_xml(root:"Contacts")但这仍然将转换后的XML包装在“联系人”中，将我的XML代码修改为</div><div class="tag"><a href="/t/amp/">amp</a><a href="/t/hash/">hash</a><a href="/t/code/">code</a><a href="/t/gt/">gt</a><a href="/t/lt/">lt</a><a href="/t/ruby-on-rails/">ruby-on-rails</a><a href="/t/ruby/">ruby</a><a href="/t/ruby-on-rails-3.1/">ruby-on-rails-3.1</a></div></div><div class="item"><h2><a href="/v/55qmce/">ruby-on-rails - 如何在 ruby 中使用两个参数异步运行 exe？</a></h2><div class="post"> exe应该在我打开页面时运行。异步进程需要运行。有什么方法可以在ruby中使用两个参数异步运行exe吗？我已经尝试过ruby命令-system()、exec()但它正在等待过程完成。我需要用参数启动exe，无需等待进程完成是否有任何rubygems会支持我的问题？最佳答案您可以使用Process.spawn和Process.wait2:pid=Process.spawn'your.exe','--option'#Later...pid,status=Process.wait2pid您的程序将作为解释器的子进程执行。除</div><div class="tag"><a href="/t/ruby/">ruby</a><a href="/t/ruby-on-rails/">ruby-on-rails</a><a href="/t/code/">code</a><a href="/t/section/">section</a><a href="/t/ruby-on-rails-3/">ruby-on-rails-3</a><a href="/t/shell/">shell</a><a href="/t/rubygems/">rubygems</a></div></div><div class="item"><h2><a href="/v/ideeb7/">ruby - 无法让 RSpec 工作—— 'require' : cannot load such file</a></h2><div class="post"> 我花了三天的时间用头撞墙，试图弄清楚为什么简单的“rake”不能通过我的规范文件。如果您遇到这种情况:任何文件夹路径中都不要有空格!。严重地。事实上，从现在开始，您命名的任何内容都没有空格。这是我的控制台输出:(在/Users/*/Desktop/LearningRuby/learn_ruby)$rake/Users/***/Desktop/LearningRuby/learn_ruby/00_hello/hello_spec.rb:116:in`require':cannotloadsuchfile--hello(LoadError) 最佳</div><div class="tag"><a href="/t/mdash/">mdash</a><a href="/t/amp/">amp</a><a href="/t/code/">code</a><a href="/t/section/">section</a><a href="/t/hello/">hello</a><a href="/t/ruby/">ruby</a><a href="/t/rspec/">rspec</a></div></div><div class="item"><h2><a href="/v/r22toi/">ruby-on-rails - rspec should have_select ('cars' , :options => ['volvo' , 'saab' ] 不工作</a></h2><div class="post"> 关闭。这个问题需要detailsorclarity.它目前不接受答案。想改进这个问题吗？通过editingthispost添加细节并澄清问题.关闭8年前。Improvethisquestion在首页我有:汽车:VolvoSaabMercedesAudistatic_pages_spec.rb中的测试代码:it"shouldhavetherightselect"dovisithome_pathit{shouldhave_select('cars',:options=>['volvo','saab','mercedes','audi'])}end响应是rspec./spec/request</div><div class="tag"><a href="/t/amp/">amp</a><a href="/t/39/">39</a><a href="/t/section/">section</a><a href="/t/option/">option</a><a href="/t/class/">class</a><a href="/t/ruby-on-rails/">ruby-on-rails</a><a href="/t/ruby/">ruby</a><a href="/t/rspec/">rspec</a></div></div><div class="item"><h2><a href="/v/bedr1u/">ruby-on-rails - s3_direct_upload 在生产服务器中不工作</a></h2><div class="post"> 在Rails4.0.2中，我使用s3_direct_upload和aws-sdkgems直接为s3存储桶上传文件。在开发环境中它工作正常，但在生产环境中它会抛出如下错误，ActionView::Template::Error(noimplicitconversionofnilintoString)在View中，create_cv_url,:id=>"s3_uploader",:key=>"cv_uploads/{unique_id}/${filename}",:key_starts_with=>"cv_uploads/",:callback_param=>"cv[direct_uplo</div><div class="tag"><a href="/t/在生/">在生</a><a href="/t/s3_direct_upload/">s3_direct_upload</a><a href="/t/code/">code</a><a href="/t/34/">34</a><a href="/t/configuration/">configuration</a><a href="/t/ruby-on-rails/">ruby-on-rails</a><a href="/t/ruby/">ruby</a><a href="/t/amazon-web-services/">amazon-web-services</a><a href="/t/amazon-s3/">amazon-s3</a><a href="/t/paperclip/">paperclip</a></div></div><div class="item"><h2><a href="/v/44nkv5/">ruby-on-rails - Nokogiri:使用 XPath 搜索 <div></a></h2><div class="post"> 我使用Nokogiri(Rubygem)css搜索寻找某些在我的html里面。看起来Nokogiri的css搜索不喜欢正则表达式。我想切换到Nokogiri的xpath搜索，因为这似乎支持搜索字符串中的正则表达式。如何在xpath搜索中实现下面提到的(伪)css搜索？require'rubygems'require'nokogiri'value=Nokogiri::HTML.parse(ABBlaCD3"HTML_END#my_blockisgivenmy_bl="1"#my_eqcorrespondstothisregexmy_eq="\/[0-9]+\/"#FIXMEThefoll</div><div class="tag"><a href="/t/ruby-on-rails/">ruby-on-rails</a><a href="/t/amp/">amp</a><a href="/t/lt/">lt</a><a href="/t/gt/">gt</a><a href="/t/39/">39</a><a href="/t/ruby/">ruby</a><a href="/t/regex/">regex</a><a href="/t/xpath/">xpath</a><a href="/t/nokogiri/">nokogiri</a></div></div><div class="item"><h2><a href="/v/ud4ild/">ruby - JetBrains RubyMine 3.2.4 调试器不工作</a></h2><div class="post"> 使用Ruby1.9.2运行IDE提示说需要gemruby-debug-base19x并提供安装它。但是，在尝试安装它时会显示消息Failedtoinstallgems.Followinggemswerenotinstalled:C:/ProgramFiles(x86)/JetBrains/RubyMine3.2.4/rb/gems/ruby-debug-base19x-0.11.30.pre2.gem:Errorinstallingruby-debug-base19x-0.11.30.pre2.gem:The'linecache19'nativegemrequiresinstall</div><div class="tag"><a href="/t/调试器/">调试器</a><a href="/t/JetBrains/">JetBrains</a><a href="/t/rubyinstaller/">rubyinstaller</a><a href="/t/section/">section</a><a href="/t/39/">39</a><a href="/t/ruby/">ruby</a><a href="/t/debugging/">debugging</a><a href="/t/rubygems/">rubygems</a><a href="/t/rubymine/">rubymine</a></div></div><div class="item"><h2><a href="/v/dhnf50/">ruby - `rescue $!` 是如何工作的？</a></h2><div class="post"> 我知道全局变量$!包含最新的异常对象，但我对下面的语法感到困惑。谁能帮助我理解以下语法？rescue$! 最佳答案此构造可防止异常停止您的程序并使堆栈跟踪冒泡。它还会将该异常作为值返回，这很有用。a=get_me_datarescue$!在此行之后，a将保存请求的数据或异常。然后您可以分析该异常并采取相应措施。defget_me_dataraise'Nodataforyou'enda=get_me_datarescue$!puts"Executioncarrieson"pa#>>Executioncarrieson#>>#更现实的</div><div class="tag"><a href="/t/rescue/">rescue</a><a href="/t/ruby/">ruby</a><a href="/t/code/">code</a><a href="/t/section/">section</a><a href="/t/exception-handling/">exception-handling</a></div></div> <div class="page"><span>1</span><a href="/t/javascript - 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