Ruby On Rails错误和解决汇总

Ruby On Rails异常和解决汇总

/usr/lib/ruby/gems/1.8/gems/execjs-1.2.7/lib/execjs/runtimes.rb:47:in `autodetect': Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable)
??? from /usr/lib/ruby/gems/1.8/gems/execjs-1.2.7/lib/execjs.rb:5
??? from /usr/lib/ruby/gems/1.8/gems/coffee-script-2.2.0/lib/coffee_script.rb:1:in `require'
?? ...
??? from script/rails:6:in `require'
??? from script/rails:6
解：在gemfile中加gem 'therubyracer'，后bundle install

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$ rake db:migrate报错：

rake aborted!

You have already activated rake 0.9.2.2, but your Gemfile requires rake 0.9.2. Consider using bundle exec.

$ gem list发现rake (0.9.2.2, 0.9.2)因此$ gem uninstall rake -v 0.9.2.2

有一次，我bundle install老是过不去。报错：/home/zj/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/site_ruby/1.9.1/rubygems/package/tar_input.rb:122:in `initialize': no metadata found in /home/zj/.rvm/gems/ruby-1.9.2-p290@rails3.1.3/cache/json-1.6.5.gem (Gem::Package::FormatError)from /home/zj/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/site_ruby/1.9.1/rubygems/package/tar_input.rb:20:in `new'上网搜了一会，没有合适的结果。后来我就找到这个json-1.6.5.gem，发现旁边还有一个json-1.6.4.gem，而这个json-1.6.5.gem大小是286k,json-1.6.4.gem是415k,所以我觉得不太对劲，索性把它删了。再来bundle install，OK，它给我下载了一个完整的了，现在OK了。

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在production模式下，发现所有assets下面的css和js都无法访问了，原因是config.serve_static_assets = true这一句写成了false。

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