fishinhouse (sean)

rails 4.0 建立项目默认缺少 2 个 gem，导致启动失败。

fishinhouse — Sat, 13 Jul 2013 00:19:05 +0800

Rails 4.0.0

$rails new webapp 项目建立成功。 cd webapp 修改 Gemfile 的源：source 'http://ruby.taobao.org' $bundle install 启动 $rails s /home/wangliang/.rvm/gems/ruby-2.0.0-p247/gems/execjs-1.4.0/lib/execjs/runtimes.rb:51:in autodetect': Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable) from /home/wangliang/.rvm/gems/ruby-2.0.0-p247/gems/execjs-1.4.0/lib/execjs.rb:5:inmodule:ExecJS' from /home/wangliang/.rvm/gems/ruby-2.0.0-p247/gems/execjs-1.4.0/lib/execjs.rb:4:in <top (required)>' from /home/wangliang/.rvm/gems/ruby-2.0.0-p247/gems/uglifier-2.1.1/lib/uglifier.rb:3:inrequire' from /home/wangliang/.rvm/gems/ruby-2.0.0-p247/gems/uglifier-2.1.1/lib/uglifier.rb:3:in <top (required)>' from /home/wangliang/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:inrequire' from /home/wangliang/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in block (2 levels) in require' from /home/wangliang/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:ineach' from /home/wangliang/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in block in require' from /home/wangliang/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:ineach' from /home/wangliang/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in require' from /home/wangliang/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler.rb:132:inrequire' from /home/wangliang/ruby-china/config/application.rb:7:in <top (required)>' from /home/wangliang/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/commands.rb:76:inrequire' from /home/wangliang/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/commands.rb:76:in block in <top (required)>' from /home/wangliang/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/commands.rb:73:intap' from /home/wangliang/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/commands.rb:73:in <top (required)>' from bin/rails:4:inrequire'

from bin/rails:4:in `'

解决办法： vim Gemfile 添加 gem 'execjs' gem 'therubyracer' $bundle install $rails s => Booting WEBrick => Rails 4.0.0 application starting in development on http://0.0.0.0:3000 => Run rails server -h for more startup options => Ctrl-C to shutdown server [2013-07-13 00:11:52] INFO WEBrick 1.3.1 [2013-07-13 00:11:52] INFO ruby 2.0.0 (2013-06-27) [x86_64-linux] [2013-07-13 00:11:52] INFO WEBrick::HTTPServer#start: pid=28681 port=3000

安装 ruby-debug 时报错

fishinhouse — Fri, 12 Jul 2013 20:09:21 +0800

$gem install ruby-debug

Fetching: columnize-0.3.6.gem (100%) Successfully installed columnize-0.3.6 Fetching: rbx-require-relative-0.0.9.gem (100%) Successfully installed rbx-require-relative-0.0.9 Fetching: linecache-0.46.gem (100%) Building native extensions. This could take a while... ERROR: Error installing ruby-debug: ERROR: Failed to build gem native extension.

/home/wangliang/.rvm/rubies/ruby-2.0.0-p247/bin/ruby extconf.rb Can't handle 1.9.x yet *** 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/wangliang/.rvm/rubies/ruby-2.0.0-p247/bin/ruby

Gem files will remain installed in /home/wangliang/.rvm/gems/ruby-2.0.0-p247/gems/linecache-0.46 for inspection. Results logged to /home/wangliang/.rvm/gems/ruby-2.0.0-p247/gems/linecache-0.46/ext/gem_make.out

如何在 devel 模式下调整日志级别

fishinhouse — Mon, 10 Jun 2013 21:48:44 +0800

现在日志信息太多了，要找到自己打的日志信息太难了，不知大家有没有什么好办法。如何调整成只显示自己用 logger.info 打出日志信息。