puras (puras)

Mac 下通过 RVM 安装 Ruby 必须安装 Homebrew 么？

puras — Fri, 08 Aug 2014 15:32:23 +0800

在安装的过程看到下面的内容： About to install Homebrew, press Enter for default installation in /usr/local, type new path if you wish custom Homebrew installation (the path needs to be writable for user)

想了解一下，安装 Homebrew 是必须的嘛？有点小洁癖，暂时不想安装 Homebrew。

谢谢

[Ember.JS] 如何让 store.find ('xxx', id) 始终都向服务端请求

puras — Thu, 03 Apr 2014 15:54:53 +0800

就是想不论本地缓存中是否能通过 store.find('xxx', id) 查到内容。都向服务端发起请求来获取内容就跟 store.find('xxx') 一样。

以上！谢谢！

Nginx+Passenger 请求异常：Couldn't forward the HTTP response back to the HTTP client:

puras — Wed, 14 Nov 2012 15:32:01 +0800

在服务器的搭建的环境： centos 64 位。 nginx+passenger

在请求的时候，偶尔会报错，由到用的阿里云，一报错就提示说可能是因为没备案。在页面上看不到其他的错误信息。

查看 nginx 的日志，发现在 error.log 日志中，有下面的日志：

[ pid=1371 thr=140574286247680 file=ext/nginx/HelperAgent.cpp:923 time=2012-11-14 15:23:25.509 ]: Couldn't forward the HTTP response back to the HTTP client: It seems the user clicked on the 'Stop' button in his browser.
[ pid=1371 thr=140574285846272 file=ext/nginx/HelperAgent.cpp:923 time=2012-11-14 15:25:51.697 ]: Couldn't forward the HTTP response back to the HTTP client: It seems the user clicked on the 'Stop' button in his browser.
[ pid=1371 thr=140574285645568 file=ext/nginx/HelperAgent.cpp:923 time=2012-11-14 15:25:55.28 ]: Couldn't forward the HTTP response back to the HTTP client: It seems the user clicked on the 'Stop' button in his browser.
[ pid=1371 thr=140574285444864 file=ext/nginx/HelperAgent.cpp:923 time=2012-11-14 15:25:56.241 ]: Couldn't forward the HTTP response back to the HTTP client: It seems the user clicked on the 'Stop' button in his browser.
[ pid=1371 thr=140574285244160 file=ext/nginx/HelperAgent.cpp:923 time=2012-11-14 15:25:57.84 ]: Couldn't forward the HTTP response back to the HTTP client: It seems the user clicked on the 'Stop' button in his browser.

每次异常的时候，都会打印一次这样的日志。不知道各位有没有碰到过类似的情况？如何解决？

上传头像且能在上传前进行裁剪的 GEM？

puras — Tue, 13 Nov 2012 13:12:21 +0800

不知道有没有上传头像并且能在上传前对图片进行裁剪，之后再上传的 GEM

看 Paperclip 的相关资料，都是上传之后，再去进行裁剪，不太爽。

想一步完成。

求～～～～

求推荐验证码的 GEM

puras — Tue, 26 Jun 2012 15:08:26 +0800

recaptcha 暂时不考虑，不想用 Google 生成的。另外，只在登录页面使用，性能要求不高。。。

谢谢

Nginx+passenger 居然比自带的服务器慢？请教！

puras — Wed, 20 Jun 2012 11:24:15 +0800

是这样的，租了一个 VPS 之前使用 nginx+passenger 来部署应用，但是响应很慢之后换成 rails 自带的服务器，启动后，速度很快这是为什么呢？

删除对话框弹出两次……

puras — Mon, 04 Jun 2012 12:06:46 +0800

页面的代码为：

<%= link_to '删除', category_path(category), :method => :delete, :confirm => '确认删除?', :class => 'btn btn-mini btn-danger' %>

在页面中，点击删除按钮时，会弹出两次确认对话框。。。这是咋回事咧？

环境：ubuntu12.04 ruby 1.9.3 rails 3.2.3 ngnix+passenger

-_-~~~

如何自定义错误消息提示

puras — Wed, 30 May 2012 16:45:53 +0800

查了一些资料 ,说是可以通过修改 config/application.rb 文件来实现. 在该文件中增加：

config.action_view.field_error_proc = Proc.new do |html_tag, instance|
    errors = Array(instance.error_message).join(',')
    %(#{html_tag}<span class="help-inline">&nbsp;#{errors}</span>).html_safe
end

全是现在遇到一个小问题。在页面中，代码如下：

 <div class="control-group">
    <%= f.label :username, '姓名', :class => 'control-label' %>
    <div class="controls">
    <%= f.text_field :username, :class => 'text_field' %>
    </div>
</div>

如果这个数据在提交的时候有错误，会在姓名和输入域后都增加错误提示信息. 如果将 label 修改为纯 HTML 的代码：

<label class="control-label" for="username">姓名</label>

后，就可以正常显示了. 怎么在 application.rb 中将 label 标签给剔除呢？

如何判断正确的请求方法?

puras — Wed, 23 May 2012 14:24:19 +0800

在 Rails 中，修改和删除，是用的所谓的 PUT 和 DELETE 请求方法，但其实是通过 POST 来模拟的，所以通过 request.method 来查的时候，取到的都是 POST，有没有什么办法，能取到 PUT 和 DELETE???

谢谢！

一个 ‘undefined method’ 的错误～～～详见贴内

puras — Fri, 18 May 2012 12:47:28 +0800

在开发一个小功能，controller 是 fun_urls_controller.rb，model 是 fun_url.rb Controller 的代码：


#encoding = utf-8
  2   
  3 class FunUrlsController < ApplicationController
  4   def index
  5     @fun_urls = FunUrl.all
  6   end
  7   
  8   def new
  9     @fun_url = FunUrl.new
 10   end 
 11         
 12   def create
 13     @fun_url = FunUrl.new(params[:fun_url])
 14     if @fun_url.save
 15       redirect_to fun_urls_url, :notice => 'URL添加成功'
 16     else
 17       render :action => :new
 18     end
 19   end
 20       
 21   def edit
 22     @fun_url = FunUrl.find(params[:id])
 23   end   
 24         
 25   def update
 26     @fun_url = FunUrl.find(params[:id])
 27     if @fun_url.update_attributes(params[:fun_url])
 28       redirect_to fun_urls_url, :notice => 'URL修改成功'
 29     else
 30       render :action => :edit
 31     end
 32   end
 33 
 34   def destroy
 35     @fun_url = FunUrl.find(params[:id])
 36 
 37     @fun_url.destroy
 38 
 39     redirect_to fun_urls_url, :alert => 'URL删除成功'
 40   end
 41 end

index 页面的代码：


 1 <article class="module width_full">
 2   <header>
 3     <h3 class="tabs_involved">URL列表</h3>
 4     <ul class="tabs">
 5       <li><%= link_to '添加', new_fun_url_path %></li>
 6     </ul>
 7   </header>
 8   <table class="tablesorter" cellspacing="0">
 9     <thead>
10       <tr>
11         <th></th>
12         <th>编码</th>
13         <th>URL</th>
14         <th>方法</th>
15         <th>操作</th>
16       </tr>
17     </thead> 
18     <tbody>
19     <% @fun_urls.each do |fun_url| %>
20       <tr>
21         <td></td>
22         <td><%= fun_url.code %></td>
23         <td><%= fun_url.url %></td>
24         <td><%= fun_url.method %></td>
25         <td>
26           <%= link_to image_tag('icn_edit.png', :border => 0), edit_fun_url_path(fun_url) %>
27         </td>
28       </tr>
29     <% end %>
30     </tbody> 
31   </table>
32 </article>

如果没有<%= link_to image_tag('icn_edit.png', :border => 0), edit_fun_url_path(fun_url) 这句，页面能正常显示，且能列出数据，如果加上这句，就会报异常：

Showing /home/puras/puras/rails/demo/app/views/fun_urls/index.html.erb where line #26 raised:

undefined method `join' for nil:NilClass
Extracted source (around line #26):

23:         <td><%= fun_url.url %></td>
24:         <td><%= fun_url.method %></td>
25:         <td>
26:           <%= link_to image_tag('icn_edit.png', :border => 0), edit_fun_url_path(fun_url) %>
27:         </td>
28:       </tr>
29:     <% end %>

执行 rake routes 后，能查看到查应的 URL 映射：

fun_urls GET    /fun_urls(.:format)            fun_urls#index
                  POST   /fun_urls(.:format)            fun_urls#create
      new_fun_url GET    /fun_urls/new(.:format)        fun_urls#new
     edit_fun_url GET    /fun_urls/:id/edit(.:format)   fun_urls#edit
          fun_url GET    /fun_urls/:id(.:format)        fun_urls#show
                  PUT    /fun_urls/:id(.:format)        fun_urls#update
                  DELETE /fun_urls/:id(.:format)        fun_urls#destroy

后台日志是：

Started GET "/fun_urls" for 127.0.0.1 at 2012-05-18 12:50:30 +0800
Processing by FunUrlsController#index as HTML
  FunUrl Load (0.1ms)  SELECT `fun_urls`.* FROM `fun_urls` 
  Rendered fun_urls/index.html.erb within layouts/application (2.2ms)
Completed 500 Internal Server Error in 5ms

ActionView::Template::Error (undefined method `join' for nil:NilClass):
    23:         <td><%= fun_url.url %></td>
    24:         <td><%= fun_url.method %></td>
    25:         <td>
    26:           <%= link_to 'aa', edit_fun_url_path(fun_url) %>
    27:         </td>
    28:       </tr>
    29:     <% end %>
  app/views/fun_urls/index.html.erb:26:in `block in _app_views_fun_urls_index_html_erb___434002087180833655_70161042647500'
  app/views/fun_urls/index.html.erb:19:in `each'
  app/views/fun_urls/index.html.erb:19:in `_app_views_fun_urls_index_html_erb___434002087180833655_70161042647500'


  Rendered /home/puras/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.3/lib/action_dispatch/middleware/templates/rescues/_trace.erb (3.6ms)
  Rendered /home/puras/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.3/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (1.2ms)
  Rendered /home/puras/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.3/lib/action_dispatch/middleware/templates/rescues/template_error.erb within rescues/layout (10.4ms)

求赐教～～～

options_for_select 如何设置默认值?

puras — Wed, 16 May 2012 13:26:46 +0800

在修改页面，使用 options_for_select 来做下拉框但是无法选择默认值，这个该如何处理呢？

<%= f.select :answer, options_for_select([['答案 A', 'A'], ['答案 B', 'B'], ['答案 C', 'C'], ['答案 D', 'D'], ['答案 E', 'E']]) %>