drshu (邪恶冷月)

转赠一张 RubyConf 的普通票

drshu — Thu, 22 Sep 2016 18:38:50 +0800

之前抽奖抽中了，可惜人不在成都了，朋友也都去不了，不想浪费这个机会，送给有缘人吧。想要的朋友留下邮箱，预祝本届大会圆满成功。

如何实现 Rails 项目的前后端分离？

drshu — Sun, 18 Sep 2016 23:53:02 +0800

现在需要做一个项目，要求实现前后端分离，因为最近一直在琢磨 Rails，所以想在之上进行尝试，但是不太清楚 Rails 上如何实现。搜索了一波之后，发现这方面的资料不是很多，并且很多东西都是我之前没有涉及到的。 Rails + ES6 + Angular2 前后端分离开发（一）
因为之前前端经验很少，知识储备不够，所以看起来很费解，能否请各位前辈指导一下如何实现比较方便？需要补充那些知识，最近买了 JS 的书JavaScript DOM 编程艺术 (第 2 版) ，正准备深入了解下，除此之外还需要哪些知识（HTML 和 CSS 除外）

还未配置好 Mina，又出现问题了，本地也跑不起来了，错误：IPAddr::InvalidAddressError: invalid address

drshu — Wed, 14 Sep 2016 22:33:06 +0800

运行rails s之后，没有异常，但是打开 localhost 之后，提示We're sorry, but something went wrong.If you are the application owner check the logs for more information.
检查development.log之后，发现错误IPAddr::InvalidAddressError: invalid address，日志截取如下：

Started GET "/" for fe80::1%lo0 at 2016-09-14 13:57:41 +0800

IPAddr::InvalidAddressError: invalid address
    from /Users/Shu/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/ipaddr.rb:560:in `in6_addr'
    from /Users/Shu/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/ipaddr.rb:497:in `initialize'
    from /Users/Shu/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/ipaddr.rb:515:in `new'
    from /Users/Shu/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/ipaddr.rb:515:in `coerce_other'
    from /Users/Shu/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/ipaddr.rb:171:in `include?'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/web-console-3.1.1/lib/web_console/whitelist.rb:17:in `block in include?'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/web-console-3.1.1/lib/web_console/whitelist.rb:17:in `any?'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/web-console-3.1.1/lib/web_console/whitelist.rb:17:in `include?'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/web-console-3.1.1/lib/web_console/request.rb:16:in `from_whitelisted_ip?'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/web-console-3.1.1/lib/web_console/whiny_request.rb:8:in `from_whitelisted_ip?'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/web-console-3.1.1/lib/web_console/middleware.rb:20:in `block in call'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/web-console-3.1.1/lib/web_console/middleware.rb:18:in `catch'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/web-console-3.1.1/lib/web_console/middleware.rb:18:in `call'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/actionpack-5.0.0/lib/action_dispatch/middleware/show_exceptions.rb:31:in `call'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/rack/logger.rb:36:in `call_app'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/rack/logger.rb:24:in `block in call'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/activesupport-5.0.0/lib/active_support/tagged_logging.rb:70:in `block in tagged'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/activesupport-5.0.0/lib/active_support/tagged_logging.rb:26:in `tagged'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/activesupport-5.0.0/lib/active_support/tagged_logging.rb:70:in `tagged'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/rack/logger.rb:24:in `call'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/sprockets-rails-3.1.1/lib/sprockets/rails/quiet_assets.rb:13:in `call'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/actionpack-5.0.0/lib/action_dispatch/middleware/request_id.rb:24:in `call'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/rack-2.0.1/lib/rack/method_override.rb:22:in `call'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/rack-2.0.1/lib/rack/runtime.rb:22:in `call'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/activesupport-5.0.0/lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/actionpack-5.0.0/lib/action_dispatch/middleware/executor.rb:12:in `call'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/actionpack-5.0.0/lib/action_dispatch/middleware/static.rb:136:in `call'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/rack-2.0.1/lib/rack/sendfile.rb:111:in `call'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/railties-5.0.0/lib/rails/engine.rb:522:in `call'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/puma-3.4.0/lib/puma/configuration.rb:224:in `call'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/puma-3.4.0/lib/puma/server.rb:569:in `handle_request'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/puma-3.4.0/lib/puma/server.rb:406:in `process_client'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/puma-3.4.0/lib/puma/server.rb:271:in `block in run'
    from /Users/Shu/.rvm/gems/ruby-2.3.0/gems/puma-3.4.0/lib/puma/thread_pool.rb:114:in `block in spawn_thread'

查询谷歌之后，找到一个类似情况的，但是没有人给出答案，求指导一下，是不是因为添加了 Mina 的原因？

已解决

使用 -b 来指定一个地址运行即可，例如rails s -b 0.0.0.0

部署 Mina 时出现了问题，总提示 pg 无法继续安装

drshu — Thu, 08 Sep 2016 15:58:38 +0800

之前听各位朋友推荐 Mina 来做部署比较方便，最近也正在尝试，但是一路上很坎坷，现在一直卡在这个问题上：
执行mina deploy之后，

-----> Creating a temporary build path
-----> Fetching new git commits
-----> Using git branch 'basic-login'
Cloning into '.'...
done.
-----> Using this git commit

Shucheng (b415511):
> update gitignore

-----> Symlinking shared paths
-----> Installing gem dependencies using Bundler
Fetching source index from https://rubygems.org/
Using rake (11.2.2) 
Using CFPropertyList (2.3.2) 
Using concurrent-ruby (1.0.2) 
Using i18n (0.7.0) 
Using minitest (5.9.0) 
Using thread_safe (0.3.5) 
Using tzinfo (1.2.2) 
Installing activesupport (5.0.0) 
Gem::InstallError: activesupport requires Ruby version >= 2.2.2.
An error occurred while installing activesupport (5.0.0), and Bundler cannot
continue.
Make sure that `gem install activesupport -v '5.0.0'` succeeds before bundling.
! ERROR: Deploy failed.
-----> Cleaning up build
Unlinking current
OK
Connection to IP closed.

 !     Command failed.
       Failed with status 1 (4864)

不知道问题到底出在哪里，服务器 Ruby 版本 2.3.0p0 (2015-12-25 revision 53290) [x86_64-linux]，bundler 版本为：1.12.5，并且gem list之中是有 activesupport (5.0.0) 的，正常安装的。
已经经过了如下的尝试：重启服务器、重新执行gem install activesupport -v '5.0.0、本地重新bundle install并 push、修改服务器 gem 服务器地址均无效。求大家帮忙，谢谢！

本问题已解决

解决办法：卸载 rvm 之后，使用 brightbox 安装 ruby，详见 7 楼

新问题

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    current directory: /var/www/sample_app/shared/bundle/ruby/2.3.0/gems/nokogiri-1.6.8/ext/nokogiri
/usr/bin/ruby2.3 -r ./siteconf20160909-4619-scgbpp.rb extconf.rb 
Cannot allocate memory - /usr/bin/ruby2.3 -r ./siteconf20160909-4619-scgbpp.rb extconf.rb  2>&1

Gem files will remain installed in /var/www/sample_app/tmp/build-14733503545042/vendor/bundle/ruby/2.3.0/gems/nokogiri-1.6.8 for inspection.
Results logged to /var/www/sample_app/tmp/build-14733503545042/vendor/bundle/ruby/2.3.0/extensions/x86_64-linux/2.3.0/nokogiri-1.6.8/gem_make.out
An error occurred while installing nokogiri (1.6.8), and Bundler cannot
continue.
Make sure that `gem install nokogiri -v '1.6.8'` succeeds before bundling.
! ERROR: Deploy failed.

我同样是执行了 gem install nokogiri -v '1.6.8'之后确认正确安装了，'gem list'之中已经有这个 nokogiri 了，但是仍然无法 deploy，内存占用最高只达到 50% 左右

本问题已解决

解决办法：sudo apt-get upgrade && sudo apt-get update

新问题

到Fetching source index from https://gems.ruby-china.org/这一步的时候会卡很久，内存占用到 50% 左右，但是最后的错误是

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    current directory: /var/www/sample_app/shared/bundle/ruby/2.3.0/gems/pg-0.18.4/ext
/usr/bin/ruby2.3 -r ./siteconf20160913-24390-122b12q.rb extconf.rb 
Cannot allocate memory - /usr/bin/ruby2.3 -r ./siteconf20160913-24390-122b12q.rb extconf.rb  2>&1

Gem files will remain installed in /var/www/sample_app/tmp/build-147374600916299/vendor/bundle/ruby/2.3.0/gems/pg-0.18.4 for inspection.
Results logged to /var/www/sample_app/tmp/build-147374600916299/vendor/bundle/ruby/2.3.0/extensions/x86_64-linux/2.3.0/pg-0.18.4/gem_make.out
An error occurred while installing pg (0.18.4), and Bundler cannot continue.
Make sure that `gem install pg -v '0.18.4'` succeeds before bundling.
! ERROR: Deploy failed.

是不是问题在 gem 之上，好头疼啊！

如何快速优雅的在服务器上部署 Rails 程序

drshu — Mon, 05 Sep 2016 23:30:24 +0800

请问现在有没有比较迅速的方式在服务器端部署 Rails？搜索了一些帖子，众说纷纭，并且最晚的回帖时间都是数年之前，Rails 项目部署太复杂，或许可以搞个一站式的软件，直接快速部署，想知道现在有没有比较成熟的方案了？
现在主要想达到的目的是搭建一个类似于 Heroku 的网站，可以直接 push 代码，因为是正在学习，对于性能等方面没有需求，国内的话 Coding 好像可以，但是开始收费了。
看到一本资料书《Rails 程序部署之道》但是一个是价格不便宜，一个是评论说学习曲线很陡，求看过的朋友给点建议。谢谢了！

请教为什么运行 Rails s 之后，浏览器看不到任何东西。

drshu — Fri, 19 Aug 2016 18:29:55 +0800

我是一个 Rails 的初学者，一直在看 Ruby on Rails Tutorial，之前一直实在云端 IDE 之中跟着教程走，但是我现在想在本地来继续写，我采取的方法是：云端 push 到最新状态，在本地克隆下来，并运行迁移以及 test，一切都没有问题。但是在运行

rails s

之后，得到的信息如下

> Booting Puma
=> Rails 5.0.0 application starting in development on http://localhost:3000
=> Run `rails server -h` for more startup options
DEPRECATION WARNING: Sprockets method `register_engine` is deprecated.
Please register a mime type using `register_mime_type` then
use `register_compressor` or `register_transformer`.
https://github.com/rails/sprockets/blob/master/guides/extending_sprockets.md#supporting-all-versions-of-sprockets-in-processors
 (called from block (2 levels) in <class:Railtie> at /Users/Shu/.rvm/gems/ruby-2.3.0/gems/sass-rails-5.0.5/lib/sass/rails/railtie.rb:57)
DEPRECATION WARNING: Sprockets method `register_engine` is deprecated.
Please register a mime type using `register_mime_type` then
use `register_compressor` or `register_transformer`.
https://github.com/rails/sprockets/blob/master/guides/extending_sprockets.md#supporting-all-versions-of-sprockets-in-processors
 (called from block (2 levels) in <class:Railtie> at /Users/Shu/.rvm/gems/ruby-2.3.0/gems/sass-rails-5.0.5/lib/sass/rails/railtie.rb:58)
Puma starting in single mode...
* Version 3.4.0 (ruby 2.3.0-p0), codename: Owl Bowl Brawl
* Min threads: 5, max threads: 5
* Environment: development
* Listening on tcp://localhost:3000
Use Ctrl-C to stop

看似正常（前面的两个 waring 在云端 IDE 中也有，我查了下 stack overflow，好像是 rails5.0.0 的一个 bug，在云端运行正常），但是我打开http://localhost:3000之后，是一片空白，终端也没有人和提示。请问如何排查问题，有没有什么 log 可以看一下，/log 之下的 test 和 development 两个 log 没有有用线索，并且后者还是不完整的。求指点，谢谢！

Update：原因已找到，是端口的问题，但是更换端口之后，无法载入所有 css 表，控制台输出很多相同的错误

2016-08-20 13:31:24 +0800: Rack app error: #<NoMethodError: undefined method `silence' for #<Logger:0x007fa321dc7e60>>

没有用过这个方法啊，查询谷歌也没有相关的内容，求帮助！

Edit：查询到一个 issue，但是和我这个没有什么关系啊，我没用到过这个 def 啊？Github-issue 重新 clone 一次项目之后，正常运行，之前的问题暂未解决。