somejump (三金)

ImageMagick 如何设置字体大小？

somejump — Sun, 26 Nov 2017 21:59:36 +0800

首先，我在 imageMagick 官网上查到了 img.weight 这个选项。

可是这个选项在 MiniMagick 里面不起效果，这是为什么？

一个诡异的 "NameError: uninitialized constant" Bug

somejump — Sun, 02 Apr 2017 22:38:28 +0800

我在服务器上用 RAILS_ENV=production rails console 结果出现如下报错：

Sport.last
NameError: uninitialized constant Sport
    from (irb):1
    from /usr/local/rvm/gems/ruby-2.2.2/gems/railties-5.0.2/lib/rails/commands/console.rb:65:in `start'
    from /usr/local/rvm/gems/ruby-2.2.2/gems/railties-5.0.2/lib/rails/commands/console_helper.rb:9:in `start'
    from /usr/local/rvm/gems/ruby-2.2.2/gems/railties-5.0.2/lib/rails/commands/commands_tasks.rb:78:in `console'

User.new
NameError: uninitialized constant User

也就是 rails console 下所有的 model 都没有加载出来，但是奇怪的是 puma 服务器居然跑起来了。而且并没有出错，使用 Sport 类的 controller 里的方法都正常工作。

问题是。。。一天之前我进过 console，输入过这些简单的命令，那时根本没有出现这样的问题。。。

class Sport < ApplicationRecord
  validates :teamone,:status,:title,presence: true
  validates :wp,:lp, length:{maximum:30}
end
class User < ApplicationRecord
  has_secure_password
end

以上是 Model 代码，求大神解救。。。

现在国外服务器还有救么？

somejump — Wed, 29 Mar 2017 11:25:14 +0800

本人大学生，买了 linode 美国新泽西节点 vps。本来想着做几个小型 rails 网站给同学们玩玩，结果卡成翔。

然而我外部的资源（什么 jq，turbolinks）几乎全都 cdn 了，ping 了一下试试看，尼玛 55% 的丢包率，这优化再好都没用啊。

而且国外服务器也没办法申请国内付费 cdn 加速，因为没发备案。

现在有没有用国外服务器的各位，请问这该怎么解决？是不是换一家情况会好点？

nginx+puma 多项目如何部署到二级域名

somejump — Sat, 18 Mar 2017 15:25:13 +0800

我对 nginx 了解不深，网上教程也比较乱，现在希望用一个服务器跑两个 rails 项目。

我本来是想修改 upstream 的，但是发现那里已经使用统一的 socks 文件代理了，于是哪里还可以绑定域名呢？

求大神帮助

js.erb 内 js 没有被执行问题

somejump — Sun, 05 Mar 2017 10:00:44 +0800

最近学习 ajax，遇到一个很奇怪的问题，因为浏览器明明已经接收到返回的 js 了，但是 js.erb 内的 js 代码都没有被执行：

事情是这样的：原本我的页面在 index 动作下，现在想往 search 动作发一个 post 请求，使 index 页面无需刷新就更新从 search 动作获得的数据

#rooms_controller
  def search
    if params[:key]
        respond_to do |f|
          f.js
        end
    end
  end

#search.js.erb
alert("hello");

服务器端显示无异常：

Started POST "/rooms/search" for 127.0.0.1 at 2017-03-05 09:46:05 +0800
Processing by RoomsController#search as JS
  Parameters: {"key"=>"星期一 J3"}
  Room Load (1.4ms)  SELECT "rooms".* FROM "rooms"
  Rendering rooms/search.js.erb
  Rendered rooms/_results.html.erb (1.7ms)
  Rendered rooms/_details.html.erb (6.4ms)
  Rendered rooms/search.js.erb (12.0ms)
Completed 200 OK in 31ms (Views: 14.1ms | ActiveRecord: 1.4ms)

浏览器返回值：

search POST 200 xhr jquery.self-bd7ddd393353a8d2480a622e80342adf488fb6006d667e8b42e4c0073393abee.js?body=1:10255 9.5 KB 44 ms

仔细查看请求的 response 也的确返回了响应的 jsalert("hello")，为什么没有执行呢？同时我也发现写在 assets/javascripts/room.js 内的 jquery 选择器失效，不知道是不是有点关系....

求大神指点

升级到 Rails 5 时 gem nio4r 无法安装问题

somejump — Mon, 06 Feb 2017 00:51:40 +0800

本小白在笔记本上写 ROR 程序时，这个 gem 成功安装了。现在在服务器上反而装不上了...... 服务器原本是 ruby 2.0.0，后来因为 rails5 要求必须升到 2.2.2 于是就出现了下面这个 bug 下面是运行命令时的错误记录：

root@hostname:/home/times# gem install nio4r -v '1.2.1'
Building native extensions.  This could take a while...
ERROR:  Error installing nio4r:
    ERROR: Failed to build gem native extension.

    /usr/local/rvm/rubies/ruby-2.2.2/bin/ruby -r ./siteconf20170206-7959-12h81e9.rb extconf.rb
checking for unistd.h... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

Provided configuration options:
    --with-opt-dir
    --without-opt-dir
    --with-opt-include
    --without-opt-include=${opt-dir}/include
    --with-opt-lib
    --without-opt-lib=${opt-dir}/lib
    --with-make-prog
    --without-make-prog
    --srcdir=.
    --curdir
    --ruby=/usr/local/rvm/rubies/ruby-2.2.2/bin/$(RUBY_BASE_NAME)
/usr/local/rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/mkmf.rb:456:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
    from /usr/local/rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/mkmf.rb:587:in `try_cpp'
    from /usr/local/rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/mkmf.rb:1060:in `block in have_header'
    from /usr/local/rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/mkmf.rb:911:in `block in checking_for'
    from /usr/local/rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/mkmf.rb:351:in `block (2 levels) in postpone'
    from /usr/local/rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/mkmf.rb:321:in `open'
    from /usr/local/rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/mkmf.rb:351:in `block in postpone'
    from /usr/local/rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/mkmf.rb:321:in `open'
    from /usr/local/rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/mkmf.rb:347:in `postpone'
    from /usr/local/rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/mkmf.rb:910:in `checking_for'
    from /usr/local/rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/mkmf.rb:1059:in `have_header'
    from extconf.rb:3:in `<main>'

extconf failed, exit code 1

Gem files will remain installed in /usr/local/rvm/gems/ruby-2.2.2/gems/nio4r-1.2.1 for inspection.
Results logged to /usr/local/rvm/gems/ruby-2.2.2/extensions/x86_64-linux/2.2.0/nio4r-1.2.1/gem_make.out

其中这一句话我觉得比较重要： Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. 以及我尝试顺藤摸瓜找到的详细错误信息（位置：/usr/local/rvm/gems/ruby-2.2.2/extensions/x86_64-linux/2.2.0/nio4r-1.2.1/mkmf.log）

"gcc -o conftest -I/usr/local/rvm/rubies/ruby-2.2.2/include/ruby-2.2.0/x86_64-linux -I/usr/local/rvm/rubies/ruby-2.2.2/include/ruby-2.2.0/ruby/backward -I/usr/local/rvm/rubies/ruby-2.2.2/include/ruby-2.2.0 -I.     -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -Wno-packed-bitfield-compat  -fPIC conftest.c  -L. -L/usr/local/rvm/rubies/ruby-2.2.2/lib -Wl,-R/usr/local/rvm/rubies/ruby-2.2.2/lib -L. -fstack-protector -rdynamic -Wl,-export-dynamic     -Wl,-rpath,'/../lib' -Wl,-R'/../lib' -lruby  -lpthread -lgmp -ldl -lcrypt -lm   -lc"
/usr/bin/ld: cannot find -lgmp
collect2: error: ld returned 1 exit status
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: int main(int argc, char **argv)
4: {
5:   return 0;
6: }
/* end */

我的想法是应该是缺了某些包，但是详细报错看不懂，也没有讲缺什么包，求大神解救～

[网站访问问题][已解决] 到底什么影响一个网站的访问速度呢？

somejump — Wed, 08 Jun 2016 18:53:04 +0800

RT 租着一台外国的服务器学习网络技术，但是发现 ROR 建起来的网站访问很慢。。。就是第一次打开一个页面卡 1min 才打开，但是这明显超过正常人的忍耐极限了。第二次打开同一个页面就快很多。 1.这是在哪个环节出现了问题呢？图片大小？css？还是 js？ 2.如果无法判断，我可以通过什么实用工具进行判断呢？请大家不要引用术语，我可能看不懂。。。

[解决方法]

若是使用 nginx 服务器的话，需要让 rails 放弃对静态资源的管理

config.serve_static_assets = false

这样会解决很多 js/css 报错的问题

Simditor 文字缩进错误问题

somejump — Sun, 28 Jun 2015 13:51:31 +0800

最近在修复文章系统，发现了一个诡异的现象：更新时用 tab 进行的排版很正常，但是 show 页面中就不行了以下是 show 和 update 的源码：

#update
.des_field
   = f.text_area :des
        coffee:
              editor = new Simditor(
                textarea: $('textarea')
                tabIndent: true
                params: {}
                toolbarFloat: true
                upload:
                  url: '/api/v1/upload/image'
                  connectionCount: 1
                  leaveConfirm: '正在上传文件，如果离开上传会自动取消'
                pasteImage: true
                toolbar: ['bold', 'italic', 'underline', '|', 'ol', 'ul', 'blockquote', 'code', '|', 'link',  '|','image', 'indent', 'outdent', '|', 'hr', 'table']
              )
#show
      .des_field
         == @article.des

.des_field 这个 class 没有任何样式，且 display 是 block 这是 CSS 的问题么？可我用浏览器调试发现删了所有 CSS 它的缩进还是有问题求帮助 QUQ

解决方案

我的 gem 老化了，所以需要到官方地址更新 JS 和 CSS： https://github.com/mycolorway/simditor/releases 谢谢@farthinker的帮助，simditor 做的很棒

[已解决][Gem RubyCas-Client] CAS 认证在生产模式下遇到的问题

somejump — Sun, 14 Jun 2015 23:16:34 +0800

Rubycas-client 是一个用来实现单点登陆的 gem 在 development 下需要在 application.rb 下加入如下几行

require 'casclient'
require 'casclient/frameworks/rails/filter'

CASClient::Frameworks::Rails::Filter.configure(
  cas_base_url: "http://somesite.com/cas",
  enable_single_sign_out: true
)

这样就可以调用 session[:cas_user] 来获取 CAS 登陆后的信息在 development 下测试良好，一般来说会自动在/tmp/sessions 下生成一个 session 可是到了生产模式：

I, [2015-06-14T20:57:27.790760 #18180]  INFO -- : Filter chain halted as CASClient::Frameworks::Rails::Filter rendered or redirected
I, [2015-06-14T20:57:27.790914 #18180]  INFO -- : Completed 302 Found in 3ms (ActiveRecord: 0.0ms)
I, [2015-06-14T20:57:28.270761 #18180]  INFO -- : Started GET "/verify?user_id=MQ%3D%3D&ticket=ST-1434286982rQdTPVk-f387GBrQPqs" for 123.112.102.233 at 2015-06-14 20:57:28 +0800
I, [2015-06-14T20:57:28.273099 #18180]  INFO -- : Processing by ProfileController#verify_identity as HTML
I, [2015-06-14T20:57:28.273166 #18180]  INFO -- :   Parameters: {"user_id"=>"MQ==", "ticket"=>"ST-1434286982rQdTPVk-f387GBrQPqs"}
I, [2015-06-14T20:57:29.568797 #18180]  INFO -- : Completed 500 Internal Server Error in 1295ms
F, [2015-06-14T20:57:29.573320 #18180] FATAL -- :
Errno::ENOENT (No such file or directory - /home/mo1.0/tmp/sessions/cas_sess.ST-1434286982rQdTPVk-f387GBrQPqs):
  /usr/local/rvm/gems/ruby-2.0.0-p643/bundler/gems/rubycas-client-b6692b942f69/lib/casclient/tickets/storage.rb:101:in `initialize'
  /usr/local/rvm/gems/ruby-2.0.0-p643/bundler/gems/rubycas-client-b6692b942f69/lib/casclient/tickets/storage.rb:101:in `new'
  /usr/local/rvm/gems/ruby-2.0.0-p643/bundler/gems/rubycas-client-b6692b942f69/lib/casclient/tickets/storage.rb:101:in `store_service_session_lookup'
  /usr/local/rvm/gems/ruby-2.0.0-p643/bundler/gems/rubycas-client-b6692b942f69/lib/casclient/frameworks/rails/filter.rb:81:in `filter'
  /usr/local/rvm/gems/ruby-2.0.0-p643/bundler/gems/rubycas-client-b6692b942f69/lib/casclient/frameworks/rails/filter.rb:15:in `before'

就有了一些问题，而我自己试了试依然没能解决以下是 production.rb 配置文件

Rails.application.configure do
  config.cache_classes = true
  config.cache_store = :redis_store, { :host => "localhost", :port => 6379, :db => 1, :namespace => "mo_production" }
  config.eager_load = false
  config.consider_all_requests_local       = false
  config.action_controller.perform_caching = true
  config.serve_static_assets = true
  config.assets.debug = true
  config.assets.compile = true
  config.assets.digest = true
  config.assets.version = '1.0'
   config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect' # for nginx
  config.log_level = :info
  config.assets.precompile += %w(mediaelementplayer.js mediaelementplayer.css home.js waterfall.js)
  config.i18n.fallbacks = true
  config.active_support.deprecation = :notify
  config.log_formatter = ::Logger::Formatter.new
  config.active_record.dump_schema_after_migration = false
end

求帮助 QUQ

解决方法：

chmod -R u+rwX,go+rX,go-w /tmp
chmod -R u+rwX,go+rX,go-w /home/yourapp/tmp
mkdir /home/yourapp/tmp/sessions

生产模式下没有自动生成 sessions 文件夹，这可能是问题之一还有读写权限问题，这是问题之二感谢@billy的热心帮助

[已解决] Rails 生产模式下 CSS 编译错误问题

somejump — Tue, 09 Jun 2015 00:58:58 +0800

我是个 rails 新手，对于 Rails 服务器 CSS 的预编译不是很熟悉首先在 application 里面写下 CSS

*= require_self
*= require home
*= require font-awesome
*= require simditor
*= require semantic-new

之后访问服务器打开浏览器 console 就有这些错误信息：

Failed to load resource: the server responded with a status of 404 (Not Found)  http://XXXXX.com/assets/simditor-34400bcae1af61814cc649711017c00f.css?body=1
Failed to load resource: the server responded with a status of 404 (Not Found) http://XXXXX.com/assets/font-awesome-5f75b3a88debb91572b2a6fc0436be29.css?body=1

等等，这些加入的 CSS 全挂了，我实际看了看那些用到 CSS 的前端，它们也确实挂了

所以这是怎么一回事呢？为什么 development 下什么事都没有呢？

需要预编译

$ RAILS_ENV=production bundle exec rake assets:precompile

更重要的是，修改静态文件之后，必须再次预编译才行，我建议还是每次跑服务器时 precompile 一下吧。

【已解决】qiniu_direct_upload 有关变量问题

somejump — Mon, 25 May 2015 22:21:20 +0800

我是个 ruby 新手，正在学习七牛云存储的一些 gem，这个 gem 十分好使，并且在给出的 demo 里面运行良好就是这个：https://github.com/huobazi/qiniu_direct_uploader 以下是实现表单的代码：

<%= qiniu_uploader_form callback_url: qiniu_callback_path,
     bucket:        'mosite',
     id:            "photograph-uploader",
     key:           "items/#{Date.today.strftime('%Y/%m')}/{timestamp}-{unique-id}-#{SecureRandom.hex}-{filename}",
     custom_fields: {iid:"#{@item.id}",bbb:2},
     progress_bar_id: 'progress-bar',
     callbackBody: "name=$(fname)&key=$(key)&iid=$(iid)\
                     &bbb=$(bbb)&iwd=12345",
     drop_paste_zone_id: 'dropzone' do %>

当我喜闻乐见的把 demo 中的表单搬到我的 project 里面的时候，我惊奇的发现{timestamp}、{filename}、{unique-id}等变量全挂了

Started POST "/images/qiniu_callback" for 127.0.0.1 at 2015-05-25 22:11:14 +0800
Processing by ImagesController#qiniu_callback as */*
  Parameters: {"etag"=>"FmNco5xtUQvPhZOdMiqVBFG8fiJM", "fname"=>"df2.jpeg", "fsize"=>"131663", "mimeType"=>"image/jpeg", "imageInfo"=>{"format"=>"jpeg", "width"=>"853", "height"=>"640", "colorModel"=>"ycbcr"}, "endUser"=>"", "key"=>"items/2015/05/{timestamp}-{unique-id}-3e545506ff0541cbd4d08f06e57a45ef-{filename}", "custom_fields"=>{"iid"=>"105", "bbb"=>"2"}, "xyz"=>"100"}

当然，demo 里面的是没问题的，应该是这样的：

Parameters: {"etag"=>"FmNco5xtUQvPhZOdMiqVBFG8fiJM", "fname"=>"df2.jpeg", "fsize"=>"131663", "mimeType"=>"image/jpeg", "imageInfo"=>{"format"=>"jpeg", "width"=>"853", "height"=>"640", "colorModel"=>"ycbcr"}, "endUser"=>"", "key"=>"items/2015/05/1432563304845-ny1pk2yr4fgupr3exgsfh4-9091677139ee85f92e54ad1dc34208bf-df2.jpeg", "custom_fields"=>{"iid"=>"51", "bbb"=>"2"}, "xyz"=>"100"}

就这样，上传到七牛空间本来应该是有名字的文件都被字符串“filename”取代了，这样就很蛋疼。那么像{timestamp}、{filename}、{unique-id}这样的变量到底是什么变量？应该不是 ruby 变量，是一个 js 变量么？于是我去除了多余的 js，仅仅保留了

//= require jquery
//= require jquery_ujs
//= require turbolinks
//
//= require_tree .

这几行，以避免 js 冲突，但是还是显示{filename} = =

求帮助 QUQ

我修改了 gem 的版本，将版本锁定到 0.0.4，结果就没有问题了

Parameters: {"etag"=>"FmNco5xtUQvPhZOdMiqVBFG8fiJM", "fname"=>"df2.jpeg", "fsize"=>"131663", "mimeType"=>"image/jpeg", "imageInfo"=>{"format"=>"jpeg", "width"=>"853", "height"=>"640", "colorModel"=>"ycbcr"}, "endUser"=>"", "key"=>"items/2015/05/1432644798226-cypsqzdouy0c5wduf0umkr-5328df4f5c501e33a62de28639af9c06-df2.jpeg", "custom_fields"=>{"iid"=>"108", "bbb"=>"2"}, "xyz"=>"100"}

【已解决】Puma + Nginx + Rails 服务器配置问题

somejump — Tue, 19 May 2015 12:10:44 +0800

我是小白，第二次配置 rails 服务器，首先创建/修改了 nginx/conf.d/mo.conf，完全复制了 puma 官方提供的源代码（当然更改了路径）

upstream myapp(这里真的就只是“myapp”，没敢改成自己的appname) {
  server unix:///home/mo1.0/tmp/puma.sock;
}

server {
  listen 80;
  server_name myapp.com;

  # ~2 seconds is often enough for most folks to parse HTML/CSS and
  # retrieve needed images/icons/frames, connections are cheap in
  # nginx so increasing this is generally safe...
  keepalive_timeout 5;

  # path for static files
  root /home/mo1.0/public;
  access_log /home/mo1.0/log/nginx.access.log;
  error_log /home/mo1.0/log/nginx.error.log info;

  # this rewrites all the requests to the maintenance.html
  # page if it exists in the doc root. This is for capistrano's
  # disable web task
  if (-f $document_root/maintenance.html) {
    rewrite  ^(.*)$  /maintenance.html last;
    break;
  }

  location / {
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;

    # If the file exists as a static file serve it directly without
    # running all the other rewite tests on it
    if (-f $request_filename) {
      break;
    }

    # check for index.html for directory index
    # if its there on the filesystem then rewite
    # the url to add /index.html to the end of it
    # and then break to send it to the next config rules.
    if (-f $request_filename/index.html) {
      rewrite (.*) $1/index.html break;
    }

    # this is the meat of the rack page caching config
    # it adds .html to the end of the url and then checks
    # the filesystem for that file. If it exists, then we
    # rewite the url to have explicit .html on the end
    # and then send it on its way to the next config rule.
    # if there is no file on the fs then it sets all the
    # necessary headers and proxies to our upstream pumas
    if (-f $request_filename.html) {
      rewrite (.*) $1.html break;
    }

    if (!-f $request_filename) {
      proxy_pass http://myapp;
      break;
    }
  }

  # Now this supposedly should work as it gets the filenames with querystrings that Rails provides.
  # BUT there's a chance it could break the ajax calls.
  location ~* \.(ico|css|gif|jpe?g|png|js)(\?[0-9]+)?$ {
     expires max;
     break;
  }

  # Error pages
  # error_page 500 502 503 504 /500.html;
  location = /500.html {
    root /home/mo1.0/public;
  }
}

然后是 config/puma.rb

threads 8,32
workers 3
preload_app!
on_worker_boot do
  ActiveSupport.on_load(:active_record) do
    ActiveRecord::Base.establish_connection
  end
end
bind 'unix:///home/mo1.0/tmp/puma.sock'
stdout_redirect '/home/mo1.0/log/stdout', '/home/mo1.0/log/stderr'
environment 'production'
daemonize
pidfile '/home/mo1.0/tmp/pids/puma.pid'
state_path '/home/mo1.0/tmp/pids/puma.state'

之后把 puma 跑起来后输入 ps aux，发现运行的进程没有 puma 直接访问 ip（lz 还不会配置域名），提示 502 bad gateway，说明 nginx 跑起来了，puma 跪了服务器是 linode 的，还挺好使的，域名买了了.com 的只不过还没 DNS 解析呢，想先测试一下，结果就这样了

求帮忙 QUQ

解决方法：看 puma 的错误日志 === puma startup: 2015-05-19 17:04:50 +0800 === /usr/local/rvm/gems/ruby-2.0.0-p643/gems/puma-2.9.0/lib/puma/cli.rb:246:in initialize': No such file or directory - /home/mo1.0/tmp/pids/puma.pid (Errno::ENOENT) from /usr/local/rvm/gems/ruby-2.0.0-p643/gems/puma-2.9.0/lib/puma/cli.rb:246:inopen' from /usr/local/rvm/gems/ruby-2.0.0-p643/gems/puma-2.9.0/lib/puma/cli.rb:246:in write_pid' from /usr/local/rvm/gems/ruby-2.0.0-p643/gems/puma-2.9.0/lib/puma/cli.rb:222:inwrite_state' from /usr/local/rvm/gems/ruby-2.0.0-p643/gems/puma-2.9.0/lib/puma/cluster.rb:332:in run' from /usr/local/rvm/gems/ruby-2.0.0-p643/gems/puma-2.9.0/lib/puma/cli.rb:499:inrun' from /usr/local/rvm/gems/ruby-2.0.0-p643/gems/puma-2.9.0/bin/puma:10:in ' from /usr/local/rvm/gems/ruby-2.0.0-p643/bin/puma:23:inload' from /usr/local/rvm/gems/ruby-2.0.0-p643/bin/puma:23:in

' from /usr/local/rvm/gems/ruby-2.0.0-p643/bin/ruby_executable_hooks:15:ineval' from /usr/local/rvm/gems/ruby-2.0.0-p643/bin/ruby_executable_hooks:15:in `' 发现文件夹路径设置错误，修正后即可（puma 可以自动生成文件，但不会生成文件夹）此外，如果去掉后台化代码后 puma 运行时是不能操控终端的，如果发现可以继续操作中断说明 puma 跪了

Carrierwave 多文件上传问题 - PG::SyntaxError: ERROR: syntax error at or near "array"

somejump — Sat, 02 May 2015 16:48:17 +0800

数据库使用的是 postgreSQL 在按着 carrierwave 给出的官方文档操作时出现了问题

rails g migration add_avatars_to_users avatars:array #我写的是add_subimages_to_images subimages:array ,改成:json也试过，不行
rake db:migrate #上一部并没有出问题，但是这步出问题了

以下是又长又多的 log，我稍微删减了一下：

== 20150502083130 AddSubimagesToImages: migrating =============================
-- add_column(:images, :subimage, :array)
rake aborted!
StandardError: An error has occurred, this and all later migrations canceled:

PG::SyntaxError: ERROR:  syntax error at or near "array"
LINE 1: ALTER TABLE "images" ADD COLUMN "subimage" array
                                                   ^
.........
ActiveRecord::StatementInvalid: PG::SyntaxError: ERROR:  syntax error at or near "array"
LINE 1: ALTER TABLE "images" ADD COLUMN "subimage" array
                                                   ^
: ALTER TABLE "images" ADD COLUMN "subimage" array
...........
PG::SyntaxError: ERROR:  syntax error at or near "array"
Tasks: TOP => db:migrate
(See full trace by running task with --trace)

是不是 pg 不支持那种方法呢？可是我又不能换数据库呀，做了好久的项目.......

求大神解答，谢谢！

不知道为什么，rails 自己生成的 migration 代码有错误应该改成这样：

class AddSubimagesToImages < ActiveRecord::Migration
  def change
    add_column :images, :subimages, :string, array: true, default: '{}'
  end
end

即可

关于七牛云的一些科普性问题

somejump — Wed, 11 Mar 2015 01:55:52 +0800

1.现在我了解的七牛云通过 ROR 上传文件的方式有两个 GEM：一个是 carrrierwave-qiniu 一个是 qiniu 这两个是什么关系？为什么需要填写两次 AK/SK？ 2.carrrierwave-qiniu 可以很流畅地运作，但是当我使用传统的表单上传方法时，总是 bad token 或者是"token not specified"，token 应该是没问题，但是总是报上述错。有人使用表单成功过么？

谢谢

gem therubyracer 和 libv8 的安装问题

somejump — Thu, 11 Dec 2014 22:53:14 +0800

本人小白，如果已经有人问过了这个问题，真的是不是我故意问的，是因为我无法通过本站的谷歌搜索。若有人问过了，××附上以前的问题链接××就行了。

-- gem install therubyracer -v '0.12.1'
Building native extensions.  This could take a while...
ERROR:  Error installing therubyracer:
    ERROR: Failed to build gem native extension.
    /home/myname/.rvm/rubies/ruby-2.1.1/bin/ruby extconf.rb
checking for main() in -lpthread... yes
checking for v8.h... no
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

Provided configuration options:
    --with-opt-dir
    --without-opt-dir
    --with-opt-include
    --without-opt-include=${opt-dir}/include
    --with-opt-lib
    --without-opt-lib=${opt-dir}/lib
    --with-make-prog
    --without-make-prog
    --srcdir=.
    --curdir
    --ruby=/home/zhengjinyang/.rvm/rubies/ruby-2.1.1/bin/ruby
    --with-pthreadlib
    --without-pthreadlib
    --enable-debug
    --disable-debug
    --with-v8-dir
    --without-v8-dir
    --with-v8-include
    --without-v8-include=${v8-dir}/include
    --with-v8-lib
    --without-v8-lib=${v8-dir}/lib
/home/myname/.rvm/gems/ruby-2.1.1/gems/libv8-3.16.14.7/ext/libv8/location.rb:50:in `configure': You have chosen to use the version of V8 found on your system (Libv8::Location::System::NotFoundError)
and *not* the one that is bundle with the libv8 rubygem. However,
it could not be located. please make sure you have a version of
v8 that is compatible with 3.16.14.7 installed. You may
need to special --with-v8-dir options if it is in a non-standard
location

thanks,
The Mgmt

    from /home/myname/.rvm/gems/ruby-2.1.1/gems/libv8-3.16.14.7/lib/libv8.rb:7:in `configure_makefile'
    from extconf.rb:32:in `<main>'

extconf failed, exit code 1

没错，我是使用了系统自带的 libv8，这是因为如果不那样我安装 libv8 都要报错错误就像上面那样：Failed to build gem native extension. 网上给的装上 libv8 的方法是加上 -- --with-system-v8 但是这明显指标不治本求助呀，难道我要重装 rails 了么？