Mongoid + MongoHQ + Heroku错误

Question

您好，这是我第一次使用mongoid + mongoHQ在heroku上部署应用程序

我设法推送到heroku，但我的应用程序有一个错误，我检查了heroku日志，结果如下所示

    2012-12-02T05:36:43+00:00 app[web.1]: Processing by HomeController#index as HTML
2012-12-02T05:36:43+00:00 app[web.1]:   Rendered home/_store_search.html.erb (1.4ms)
2012-12-02T05:36:43+00:00 app[web.1]:     7: 
2012-12-02T05:36:43+00:00 app[web.1]:     9:        <div class="store">
2012-12-02T05:36:43+00:00 app[web.1]: 
2012-12-02T05:36:43+00:00 app[web.1]: 
2012-12-02T05:36:43+00:00 app[web.1]: ActionView::Template::Error (undefined method `[]' for nil:NilClass):
2012-12-02T05:36:43+00:00 app[web.1]:     6:    <h4 align="center">Best of Yelp Stores </h4>
2012-12-02T05:36:43+00:00 heroku[router]: at=info method=GET path=/ host=evening-bayou-5137.herokuapp.com fwd=128.54.34.17 dyno=web.1 queue=0 wait=0ms connect=1ms service=332ms status=500 bytes=643
2012-12-02T05:36:43+00:00 app[web.1]:     11:           
2012-12-02T05:36:43+00:00 app[web.1]:   Rendered home/index.html.erb within layouts/application (102.9ms)
2012-12-02T05:36:43+00:00 app[web.1]:   app/views/home/index.html.erb:8:in `sort_by'
2012-12-02T05:36:43+00:00 app[web.1]: 
2012-12-02T05:36:43+00:00 app[web.1]:     5: 
2012-12-02T05:36:43+00:00 app[web.1]: Completed 500 Internal Server Error in 180ms
2012-12-02T05:36:43+00:00 app[web.1]:     8:    <% @stores.sort_by{ |store| store.avg_rating || 0}.reverse.each.with_index do |store, index| %>
2012-12-02T05:36:43+00:00 app[web.1]:     10:           
2012-12-02T05:36:43+00:00 app[web.1]:   app/views/home/index.html.erb:8:in `_app_views_home_index_html_erb__1734857390086193972_44325160'
2012-12-02T05:36:44+00:00 heroku[router]: at=info method=GET path=/favicon.ico host=evening-bayou-5137.herokuapp.com fwd=128.54.34.17 dyno=web.1 queue=0 wait=0ms connect=0ms service=7ms status=200 bytes=0
2012-12-02T05:41:38+00:00 heroku[api]: Starting process with command `bundle exec rails console` by jsabilla@ucsd.edu
2012-12-02T05:41:45+00:00 heroku[run.9005]: Starting process with command `bundle exec rails console`
2012-12-02T05:41:45+00:00 heroku[run.9005]: Awaiting client
2012-12-02T05:41:45+00:00 heroku[run.9005]: State changed from starting to up
2012-12-02T05:46:25+00:00 heroku[run.9005]: Client connection closed. Sending SIGHUP to all processes
2012-12-02T05:46:26+00:00 heroku[run.9005]: Process exited with status 0
2012-12-02T05:46:26+00:00 heroku[run.9005]: State changed from up to complete
2012-12-02T05:46:35+00:00 heroku[api]: Starting process with command `bundle exec rake db:setup` by jsabilla@ucsd.edu
2012-12-02T05:46:40+00:00 heroku[run.8128]: State changed from starting to up
2012-12-02T05:46:55+00:00 heroku[run.8128]: State changed from up to complete
2012-12-02T05:47:01+00:00 heroku[api]: Starting process with command `bundle exec rake db:setup --trace` by jsabilla@ucsd.edu
2012-12-02T05:47:09+00:00 heroku[run.7343]: Awaiting client
2012-12-02T05:47:09+00:00 heroku[run.7343]: Starting process with command `bundle exec rake db:setup --trace`
2012-12-02T05:47:10+00:00 heroku[run.7343]: State changed from starting to up
2012-12-02T05:47:25+00:00 heroku[run.7343]: Process exited with status 1
2012-12-02T05:47:25+00:00 heroku[run.7343]: State changed from up to complete

最初我认为这是因为我的db是空的，所以我尝试运行: heroku运行db:seed，它给了我一个未定义的错误nil类

在这一点上，任何输入都会有所帮助。谢谢你

Answer 1

Mongoid在Ruby 1.9.2上运行时会抛出这个异常。你需要告诉Heroku使用1.9.3，只要把这个放到你的Gemfile里

ruby "1.9.3"