newbie

用 Rails 的 rake 或 rails runner 执行批处理时，带多个参数大家是怎么做的？

newbie — Tue, 23 Jun 2015 09:19:05 +0800

比如我要这样用一个批处理：

bundle exec rails runner MyTask hello --params1 '1' --params2 '2'

这时执行时会提示：

ERROR: "rails_runner help" was called with arguments ["--params1", "1", "--params2", "2"]
Usage: "rails_runner help [COMMAND]"

为什么会提示 rails_runner ？不加参数可以正常执行 hello 方法。

如果用 Thor ，可以专门做命令行接口，但把它放到 rails 的 lib/tasks 下似乎不能访问 Active Record，是这样吗？

误敲一个域名，得到意外发现，不得其解

newbie — Tue, 10 Feb 2015 15:53:10 +0800

如图，本想访问 Speaker Deck，不小心在最后多敲了一个点，结果出现 Heroku 的页面，产生两个问题：

它被部署在 Heroku 上了吗？
com. 的含义是什么？域名还有这个学问？这个重置原理是什么？（都算作第二个问题吧）

部署 Nginx + Unicorn 时连接 sock 错误是什么原因呢？

newbie — Sun, 24 Aug 2014 16:10:34 +0800

nginx 配置 (/etc/nginx/sites-enabled/default) 中：

upstream app {
    # Path to Unicorn SOCK file, as defined previously
    server unix:/tmp/unicorn.myapp.sock fail_timeout=0;
}

server {


    listen 80;
    server_name localhost;

    # Application root, as defined previously
    root /root/my_app/public;

    try_files $uri/index.html $uri @app;

    location @app {
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $http_host;
        proxy_redirect off;
        proxy_pass http://app;
    }

    error_page 500 502 503 504 /500.html;
    client_max_body_size 4G;
    keepalive_timeout 10;

我访问网站时 nginx 的 error log /var/log/nginx/error.log 中出现下面错误：

14/08/24 07:55:50 [error] 26968#0: *1 connect() to unix:/tmp/unicorn.myapp.sock failed (111: Connection refused) while connecting to upstream, client: 123.456.789.012, server: localhost, request: "GET / HTTP/1.1", upstream: "http://unix:/tmp/unicorn.myapp.sock:/", host: "123.456.789.012"

查了下相关信息，这里有一样的情况：

http://stackoverflow.com/questions/5707938/unicorn-nginx-upstream-server-not-starting

但把 unix:/tmp/sockets/unicorn.sock 改成 127.0.0.1:3000，还是 Connect refused 错误。

具体原因在哪里呢？

用 Rails 的 Helper raw 显示数据，破坏了 html 格式怎么办？

newbie — Fri, 22 Aug 2014 14:02:10 +0800

数据库中插入一条这样的数据：

books

|id|content|
|---|---|
|1|</table>|

这样读出来后，在视图曾这样写的时候：

<%= raw book.content %>

就破坏了原来的表格，但还是想把内容直观显示出来，怎么办？

大家都用什么方式导入项目所需的基本数据？

newbie — Wed, 09 Jul 2014 11:39:22 +0800

现在团队的做法是，用 Excel 编辑大量程序初期所需基础数据，然后写宏转换成 SQL 的 insert 语句并生成相关文件，再用还原的方式导入到数据库中。有没有更好的办法？

seed_fu 这个 gem 可以导入，但编辑起数据还不是太方便。

FactoryGirl 主从表的数据怎么造？

newbie — Mon, 02 Jun 2014 09:57:50 +0800

主表

FactoryGirl.define do
  factory :school do |f|
    f.name = "school0"
  end
end

从表

FactoryGirl.define do
  factory :student do |f|
    f.school_id = ? # 这里怎么把主表school创建的记录ID设置到这？
    f.name = "zhangsan"
  end
end

通过 passenger-install-nginx-module 安装的 nginx 和直接安装的 nginx 有什么区别？

newbie — Thu, 19 Dec 2013 10:48:54 +0800

系统中的 nginx 是这样安装的

sudo apt-get install nginx

安装了 passenger 后

gem install passenger

还需安装 nginx module 才能在 nginx 中配置使用它。在安装时

passenger-install-nginx-module

提示

Automatically download and install Nginx?

Nginx doesn't support loadable modules such as some other web servers do,
so in order to install Nginx with Passenger support, it must be recompiled.

Do you want this installer to download, compile and install Nginx for you?

 1. Yes: download, compile and install Nginx for me. (recommended)
    The easiest way to get started. A stock Nginx 1.4.4 with Passenger
    support, but with no other additional third party modules, will be
    installed for you to a directory of your choice.

 2. No: I want to customize my Nginx installation. (for advanced users)
    Choose this if you want to compile Nginx with more third party modules
    besides Passenger, or if you need to pass additional options to Nginx's
    'configure' script. This installer will  1) ask you for the location of
    the Nginx source code,  2) run the 'configure' script according to your
    instructions, and  3) run 'make install'.

Whichever you choose, if you already have an existing Nginx configuration file,
then it will be preserved.

【问题 1】这样再次安装 nginx 的话，和原来的版本没有冲突吗？

直接安装的 nginx 的启动方法是

sudo service nginx start
sudo service nginx restart
sudo service nginx stop

通过 passenger-install-nginx-module 安装的 nginx 的启动方法是

sudo nginx
sudo nginx -s reload
sudo nginx -s stop

【问题 2】为什么会有这样的区别呢？

【问题 3】在已经存在 nginx 的系统中，有其它方式安装 passenger 的 nginx module 吗？

ruby 1.8.7 如何安装 libxml-ruby 0.8.3？

newbie — Mon, 16 Dec 2013 17:21:35 +0800

ruby 版本：1.8.7 OS: Ubuntu12.04

在 rails 项目下执行安装 gemfile 的命令

bundle install --path .bundle

得到下面结果


Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

        /usr/bin/ruby1.9.1 extconf.rb 
extconf.rb:6: stack level too deep (SystemStackError)


Gem files will remain installed in /home/username/path/.bundle/ruby/1.9.1/gems/libxml-ruby-0.8.3 for inspection.
Results logged to /home/username/path/.bundle/ruby/1.9.1/gems/libxml-ruby-0.8.3/ext/libxml/gem_make.out

An error occurred while installing libxml-ruby (0.8.3), and Bundler cannot continue.
Make sure that `gem install libxml-ruby -v '0.8.3'` succeeds before bundling.

运行

sudo gem install libxml-ruby -v '0.8.3'

却提示：


Building native extensions.  This could take a while...
Successfully installed libxml-ruby-0.8.3
Installing ri documentation for libxml-ruby-0.8.3

No definition for input_callbacks_add_scheme

No definition for input_callbacks_remove_scheme

No definition for ruby_xml_node2_new_native

Enclosing class/module 'cXMLSaxParser' for module Callbacks not known

No definition for ruby_xml_html_parser_new_file

No definition for ruby_xml_html_parser_new_io

No definition for ruby_xml_html_parser_filename_get

No definition for ruby_xml_html_parser_filename_set

No definition for ruby_xml_html_parser_io_get

No definition for ruby_xml_html_parser_io_set

No definition for ruby_xml_parser_context_options_get

No definition for ruby_xml_parser_context_options_set
/usr/local/lib/ruby/1.8/rdoc/rdoc.rb:280: warning: conflicting chdir during another chdir block
/usr/local/lib/ruby/1.8/rdoc/rdoc.rb:287: warning: conflicting chdir during another chdir block
Done installing documentation for libxml-ruby after 2 seconds
1 gem installed

但 Gemfile.lock 没法正常生成。

如何改变 rvm 的 gemdir？

newbie — Fri, 13 Dec 2013 11:35:04 +0800


$ rvm use system
ruby 1.8.7 (2013-06-27 patchlevel 374) [x86_64-linux]

$ rvm gemset list_all

gemsets for ruby-1.8.7-p374 (found in /home/username/.rvm/gems/ruby-1.8.7-p374)
=> (default)
   global

gemsets for ruby-2.0.0-p247 (found in /home/username/.rvm/gems/ruby-2.0.0-p247)
=> (default)
   global

gemsets for ruby-1.9.3-p448 (found in /home/username/.rvm/gems/ruby-1.9.3-p448)
=> (default)
   global

$ rvm gemdir 1.8.7

$ gem env

RubyGems Environment:
  - RUBYGEMS VERSION: 1.8.17
  - RUBY VERSION: 2.0.0 (2013-06-27 patchlevel 247) [x86_64-linux]
  - INSTALLATION DIRECTORY: /home/username/.rvm/gems/ruby-2.0.0-p247
  - RUBY EXECUTABLE: /home/username/.rvm/rubies/ruby-2.0.0-p247/bin/ruby
  - EXECUTABLE DIRECTORY: /home/username/.rvm/gems/ruby-2.0.0-p247/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86_64-linux
  - GEM PATHS:
     - /home/username/.rvm/gems/ruby-2.0.0-p247
     - /home/username/.rvm/gems/ruby-2.0.0-p247@global
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :benchmark => false
     - :backtrace => false
     - :bulk_threshold => 1000
  - REMOTE SOURCES:
     - http://rubygems.org/

运行 rvm gemdir 1.8.7 结果还是 /home/username/.rvm/gems/ruby-2.0.0-p247，怎么换到 ruby-1.8.7-p374 ？