heroku run rake db:migrate 出错 - Errno::ENOENT: 没有这样的文件或目录 - /app/db/schema.rb答案

【问题标题】：Error with heroku run rake db:migrate - Errno::ENOENT: No such file or directory - /app/db/schema.rbheroku run rake db:migrate 出错 - Errno::ENOENT: 没有这样的文件或目录 - /app/db/schema.rb
【发布时间】：2015-05-08 05:38:39
【问题描述】：

我试图让我的项目在 Heroku 上运行，但是当我尝试运行“rake db:migrate”时得到以下结果

有什么想法吗？？？？

谢谢:)

P.D：我认为问题就在这里

** Execute db:schema:dump
rake aborted!

因为

写入磁盘的 Rake 任务，例如 rake db:schema:dump，与 Heroku 的临时文件系统不兼容。

   PS C:\Users\siel3\Documents\nimbus> heroku run rake db:migrate --trace
Running `rake db:migrate --trace` attached to terminal... up, run.6524
** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** Execute environment
** Invoke db:load_config (first_time)
** Execute db:load_config
** Execute db:migrate
** Invoke db:_dump (first_time)
** Execute db:_dump
** Invoke db:schema:dump (first_time)
** Invoke environment
** Invoke db:load_config
** Execute db:schema:dump
rake aborted!
Errno::ENOENT: No such file or directory - /app/db/schema.rb
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.2/lib/active_record/railties/databases.rake:243:in `initialize'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.2/lib/active_record/railties/databases.rake:243:in `open'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.2/lib/active_record/railties/databases.rake:243:in `block (3 levels)
 in <top (required)>'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:240:in `call'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:240:in `block in execute'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:235:in `each'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:235:in `execute'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:179:in `block in invoke_with_call_chain'
/app/vendor/ruby-2.0.0/lib/ruby/2.0.0/monitor.rb:211:in `mon_synchronize'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:172:in `invoke_with_call_chain'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:165:in `invoke'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.2/lib/active_record/railties/databases.rake:50:in `block (2 levels)
in <top (required)>'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:240:in `call'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:240:in `block in execute'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:235:in `each'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:235:in `execute'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:179:in `block in invoke_with_call_chain'
/app/vendor/ruby-2.0.0/lib/ruby/2.0.0/monitor.rb:211:in `mon_synchronize'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:172:in `invoke_with_call_chain'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:165:in `invoke'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.2/lib/active_record/railties/databases.rake:45:in `block (2 levels)
in <top (required)>'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:240:in `call'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:240:in `block in execute'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:235:in `each'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:235:in `execute'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:179:in `block in invoke_with_call_chain'
/app/vendor/ruby-2.0.0/lib/ruby/2.0.0/monitor.rb:211:in `mon_synchronize'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:172:in `invoke_with_call_chain'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:165:in `invoke'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:150:in `invoke_task'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:106:in `block (2 levels) in top_level'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:106:in `each'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:106:in `block in top_level'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:115:in `run_with_threads'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:100:in `top_level'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:78:in `block in run'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:176:in `standard_exception_handling'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:75:in `run'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/bin/rake:33:in `<top (required)>'
/app/vendor/bundle/ruby/2.0.0/bin/rake:23:in `load'
/app/vendor/bundle/ruby/2.0.0/bin/rake:23:in `<main>'
Tasks: TOP => db:schema:dump

【问题讨论】：

标签： ruby-on-rails heroku rake migrate

【解决方案1】：

您的应用程序中没有 db/schema.rb 文件吗？该文件应该在 ApplicationName/db/schema.rb 如果这是您第一次上传到 heroku，可以尝试先运行 rake db:seed 来创建模式文件，然后再进行迁移。

【讨论】：

是的，文件在那里，应用程序在本地运行没有问题。我之前尝试运行“heroku run rake db:seed”，但错误保持不变。

【解决方案2】：

问题是 Windows...

Windows 将 /db 文件夹重命名为 /DB，如果发生这种情况，heroku 会中断。

【讨论】：