2forVendetta (2子仇杀队)

我想问一下 ifttt 的技术实现如何

2forVendetta — Sat, 11 Jan 2014 23:17:22 +0800

ifttt 的服务很有意思但是不支持国内的服务比如饭否微信
我想写个小玩具玩玩但是不太明白其中的技术实现他是通过 corn 去扫你绑定的服务然后去执行动作么？我觉得这个性能和效率上有点问题吧再比如说根据天气预报发送手机短信这个对时间要求也很高
还不太明白其中的实现方式而且 ifttt 还是用 rails 写的

Rails 的第一个项目简单的论坛

2forVendetta — Mon, 10 Jun 2013 12:25:32 +0800

看了 andor_chen 哥翻译的《Ruby on Rails Tutorial》然后写了个简单的论坛现在功能还非常简陋不过觉得 rails 开发速度确实非常快一些理念非常好只不过开始不太适应特别是 assets pipeline 这东西有些兼容 ie6 的 css 样式都编译不通过还有就是 hash 有的地方用=> 有地方用 json 形式让人有点晕开始用了 rails 以后发现 yii 很多理念都是借鉴 rails 的而且上手比 php python 容易多了部署也还好只是 php 中文资料比较多罢了 e 文不好的我头疼啊要是数据分析和科学计算再给力点就更完美了当然还要谢谢社区和 QQ 群的朋友帮忙解答一些比较 2 的问题

http://www.baiwale.com

请教一下关于 rails assets precompile 问题

2forVendetta — Mon, 03 Jun 2013 22:39:53 +0800

我用的 nginx+unicorn
访问网站会出现 We're sorry, but something went wrong.
我看了一下 production.log

Connecting to database specified by database.yml
Started GET "/" for 112.226.204.86 at 2013-06-03 22:24:47 +0800
Processing by DiscussionsController#index as HTML
  Rendered collection (0.0ms)
  Rendered discussions/_discussions.html.erb (0.8ms)
  Rendered discussions/index.html.erb within layouts/application (18.0ms)
Completed 500 Internal Server Error in 128ms

ActionView::Template::Error (application.css isn't precompiled):
    3: <head>
    4:   <title><%= full_title(yield(:title)) %></title>
    5:   <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    6:   <%= stylesheet_link_tag    "application", :media => "all" %>
    7:   <%= stylesheet_link_tag    "home", :media => "all" %>
    8:   <%= javascript_include_tag "application" %>
    9:   <%= csrf_meta_tags %>
  app/views/layouts/application.html.erb:6:in `_app_views_layouts_application_html_erb___881267949553662586_30659220'

然后根据 stackoverflow 上说的设置了 config.assets.compile = true 重启了 unicorn 依然还是上面的情况
最后 rake assets:precompile 又报出一些错误

/usr/bin/ruby1.9.1 /usr/local/bin/rake assets:precompile:all RAILS_ENV=production RAILS_GROUPS=assets
rake aborted!

  (in /var/rails/baiwale/app/assets/javascripts/application.js)
/var/lib/gems/1.9.1/gems/execjs-1.4.0/lib/execjs/external_runtime.rb:142:in `exec_runtime'
/var/lib/gems/1.9.1/gems/execjs-1.4.0/lib/execjs/external_runtime.rb:28:in `block in exec'
/var/lib/gems/1.9.1/gems/execjs-1.4.0/lib/execjs/external_runtime.rb:41:in `compile_to_tempfile'
/var/lib/gems/1.9.1/gems/execjs-1.4.0/lib/execjs/external_runtime.rb:27:in `exec'
/var/lib/gems/1.9.1/gems/uglifier-2.1.0/lib/uglifier.rb:173:in `really_compile'
/var/lib/gems/1.9.1/gems/uglifier-2.1.0/lib/uglifier.rb:97:in `compile'
/var/lib/gems/1.9.1/gems/actionpack-3.2.13/lib/sprockets/compressors.rb:74:in `compress'
/var/lib/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/processing.rb:265:in `block in js_compressor='
/var/lib/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/processor.rb:29:in `call'
/var/lib/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/processor.rb:29:in `evaluate'
/var/lib/gems/1.9.1/gems/tilt-1.4.1/lib/tilt/template.rb:103:in `render'
/var/lib/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/context.rb:193:in `block in evaluate'
/var/lib/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/context.rb:190:in `each'
/var/lib/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/context.rb:190:in `evaluate'
/var/lib/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/bundled_asset.rb:26:in `initialize'
/var/lib/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/base.rb:252:in `new'
/var/lib/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/base.rb:252:in `build_asset'
/var/lib/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/index.rb:93:in `block in build_asset'
/var/lib/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/caching.rb:19:in `cache_asset'
/var/lib/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/index.rb:92:in `build_asset'
/var/lib/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/base.rb:169:in `find_asset'
/var/lib/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/index.rb:60:in `find_asset'
/var/lib/gems/1.9.1/gems/actionpack-3.2.13/lib/sprockets/static_compiler.rb:19:in `block in compile'
/var/lib/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/base.rb:219:in `block in each_logical_path'
/var/lib/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/base.rb:206:in `block (2 levels) in each_file'
/var/lib/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/base.rb:196:in `each'
/var/lib/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/base.rb:196:in `each_entry'
/var/lib/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/base.rb:204:in `block in each_file'
/var/lib/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/base.rb:203:in `each'
/var/lib/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/base.rb:203:in `each_file'
/var/lib/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/base.rb:217:in `each_logical_path'
/var/lib/gems/1.9.1/gems/actionpack-3.2.13/lib/sprockets/static_compiler.rb:18:in `compile'
/var/lib/gems/1.9.1/gems/actionpack-3.2.13/lib/sprockets/assets.rake:56:in `internal_precompile'
/var/lib/gems/1.9.1/gems/actionpack-3.2.13/lib/sprockets/assets.rake:70:in `block (3 levels) in <top (required)>'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:246:in `call'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:246:in `block in execute'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:241:in `each'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:241:in `execute'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:184:in `block in invoke_with_call_chain'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:177:in `invoke_with_call_chain'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:170:in `invoke'
/var/lib/gems/1.9.1/gems/actionpack-3.2.13/lib/sprockets/assets.rake:60:in `block (3 levels) in <top (required)>'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:246:in `call'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:246:in `block in execute'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:241:in `each'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:241:in `execute'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:184:in `block in invoke_with_call_chain'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:177:in `invoke_with_call_chain'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:170:in `invoke'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:143:in `invoke_task'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:101:in `block (2 levels) in top_level'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:101:in `each'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:101:in `block in top_level'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:110:in `run_with_threads'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:95:in `top_level'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:73:in `block in run'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:160:in `standard_exception_handling'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:70:in `run'
Tasks: TOP => assets:precompile:primary
(See full trace by running task with --trace)
rake aborted!
Command failed with status (1): [/usr/bin/ruby1.9.1 /usr/local/bin/rake ass...]
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/file_utils.rb:53:in `block in create_shell_runner'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/file_utils.rb:45:in `call'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/file_utils.rb:45:in `sh'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/file_utils_ext.rb:37:in `sh'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/file_utils.rb:80:in `ruby'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/file_utils_ext.rb:37:in `ruby'
/var/lib/gems/1.9.1/gems/actionpack-3.2.13/lib/sprockets/assets.rake:12:in `ruby_rake_task'
/var/lib/gems/1.9.1/gems/actionpack-3.2.13/lib/sprockets/assets.rake:21:in `invoke_or_reboot_rake_task'
/var/lib/gems/1.9.1/gems/actionpack-3.2.13/lib/sprockets/assets.rake:29:in `block (2 levels) in <top (required)>'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:246:in `call'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:246:in `block in execute'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:241:in `each'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:241:in `execute'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:184:in `block in invoke_with_call_chain'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:177:in `invoke_with_call_chain'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:170:in `invoke'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:143:in `invoke_task'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:101:in `block (2 levels) in top_level'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:101:in `each'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:101:in `block in top_level'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:110:in `run_with_threads'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:95:in `top_level'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:73:in `block in run'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:160:in `standard_exception_handling'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:70:in `run'
Tasks: TOP => assets:precompile
(See full trace by running task with --trace)

实在是有点晕
还有实验了 config.assets.precompile += %w( application.css ) 和 config.assets.precompile += %w( application.js ) 还是不可以 -.-!
麻烦各位帮忙看看谢谢

rails 的 any? 的奇怪问题

2forVendetta — Wed, 22 May 2013 16:44:57 +0800

这是我一开始的代码 @discussion.topics里是有数据的但是输出的 else 里面的东西

然后我把@discussion.topics打印了一下显示 @discussion.topics.any? 是假

我很郁闷在控制台里打印明明是 true 然后我又把@discussion.topics打印了一下我靠我彻底晕了@discussion.topics里是有数据的 @discussion.topics.any? 变成了 ture

紧接着我又恢复到第一步结果还是输出 else

最后我只能改成 length

输出正常既然用 discussion.topics.length 正常显示说明@discussion.topics里却是有数据不理解请教下各位

Rails 一个赋值的问题

2forVendetta — Tue, 14 May 2013 19:16:15 +0800

当用户登录的时候会我需要生成一个随机密钥存到数据库和 cookie 里

cookies.permanent[:remember_token] = SecureRandom.urlsafe_base64
user.update_attributes(remember_token: cookies.permanent[:remember_token])

这是一开始的代码会出现一个undefined method '[]' for nil:NilClass 错误找了半天也没看到问题于是修改了一下代码

user.update_attributes(remember_token: SecureRandom.urlsafe_base64)
cookies.permanent[:remember_token] = user.remember_token

就没有问题了

但是两段代码从语义上来说没有区别不懂怎么会提示 [] 为方法的错误... 然后把cookies.permanent[:remember_token] 编程"#{cookies.permanent[:remember_token]}"还是提示同样的错误

数据库字段 not null 而表单没有字段项的情况下如何处理

2forVendetta — Tue, 14 May 2013 09:37:18 +0800

现在是当用户注册的时候 user 表里的 location 字段设置的非空而表单里没有这一项在插入数据库的会报错
看 ruby-china 好像在数据库设置的时候不必填的字段是允许为空值
我现在的处理方案是 before_save { |user| user.localtion = localtion.nil? ? '' : localtion } 感觉有点傻-.- rails 里是否可以自动的讲表单里没有的字段变成''

Ruby 可以做数据抓取和分析的事情么

2forVendetta — Mon, 13 May 2013 21:20:27 +0800

现在只知道 rails
我想从微博根据一些条件获得数据然后进行筛选分析找出我最有可能认识的人这方面 ruby 可以做么有什么数据分析方面的好用的库
谢谢

rails 如何设置数据库字段长度

2forVendetta — Thu, 09 May 2013 12:18:21 +0800

比如 varchar(100) 这种看到教程都是 name:string 然后数据库默认都是 255 的

忽然发现一个小问题

2forVendetta — Mon, 06 May 2013 20:16:22 +0800

两个回帖数不同步因为缓存么？

如果缓存问题大家一般是按照固定时间刷新缓存还是当回帖的时候触发更新缓存动作

《乔布斯：遗失的访谈》中英文字幕

2forVendetta — Sat, 04 May 2013 20:47:56 +0800

虽然不是每个人都是果粉但大多数人都用着苹果的产品 16 年前遗失的乔布斯访谈

如何修改已经生成脚手架的控制器模型和表明

2forVendetta — Fri, 26 Apr 2013 20:13:19 +0800

今天刚收到 @andor_chen Ruby on Rails Tutorial 翻译的电子书开始了 ruby 的学习但是在第二章生成脚手架的时候我把 micropost 写成了 microblog 并且已经 rake db 了感觉很不爽想修改回来但是没有搜到相关的方法问一下如何修改或者删除这个脚手架生成的内容再或者把他生成的文件都修改一遍-.-!?

已解决谢谢@small_fish__ 使用 rails d scaffold Microblog 删除脚手架 rake db:rollback 回滚数据库