rails错误记录
错误1
在创建rails的数据库时，rake db:create RAILS_ENV='development'出现如下错误：
Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes.
/home/liuxiaoqin/ruby/depot/config/application.rb:7
/home/liuxiaoqin/ruby/depot/Rakefile:5
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解决方法：
1. 首先安装libv8
gem install 'libv8'
在安装libv8出错，
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nable to find a compiler officially supported by v8.It is recommended to use GCC v4.4 or higherTraceback (most recent call last): File "build/gyp/gyp", line 15, in ? import gyp File "build/gyp/pylib/gyp/__init__.py", line 8, in ? import gyp.input File "build/gyp/pylib/gyp/input.py", line 14, in ? import gyp.common File "build/gyp/pylib/gyp/common.py", line 375 with open(source_path) as source_file: ^SyntaxError: invalid syntax
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?看上去是GCC的原因实际是python版本的问题，为了跳过这个问题，
使用如下命令：
gem install libv8 --version=3.11.8.3
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2. 安装rubytracer
gem install therubyracer --version=0.10.2
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3.安装execjs
gem install execjs
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4.在Gemfile中添加：
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gem 'therubyracer'gem 'execjs'
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5. bundle install
6.rake db:create RAILS_ENV='development'
成功！
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错误2/Library/Ruby/Gems/1.8/gems/rack-1.4.1/lib/rack/handler/thin.rb:1:in `require': no such file to load -- thin (LoadError)from /Library/Ruby/Gems/1.8/gems/rack-1.4.1/lib/rack/handler/thin.rb:1from /Library/Ruby/Gems/1.8/gems/rack-1.4.1/lib/rack/handler.rb:20:in `const_get'from /Library/Ruby/Gems/1.8/gems/rack-1.4.1/lib/rack/handler.rb:20:in `get'from /Library/Ruby/Gems/1.8/gems/rack-1.4.1/lib/rack/server.rb:269:in `inject'from /Library/Ruby/Gems/1.8/gems/rack-1.4.1/lib/rack/handler.rb:20:in `each'from /Library/Ruby/Gems/1.8/gems/rack-1.4.1/lib/rack/handler.rb:20:in `inject'from /Library/Ruby/Gems/1.8/gems/rack-1.4.1/lib/rack/handler.rb:20:in `get'from /Library/Ruby/Gems/1.8/gems/rack-1.4.1/lib/rack/server.rb:269:in `server'from /Library/Ruby/Gems/1.8/gems/railties-3.2.8/lib/rails/commands/server.rb:59:in `start'from /Library/Ruby/Gems/1.8/gems/railties-3.2.8/lib/rails/commands.rb:55from /Library/Ruby/Gems/1.8/gems/railties-3.2.8/lib/rails/commands.rb:50:in `tap'from /Library/Ruby/Gems/1.8/gems/railties-3.2.8/lib/rails/commands.rb:50from ./script/rails:6:in `require'from ./script/rails:6?在GemFile中添加 gem 'thin'即可。