如何将Heroku应用程序从MySql切换到PostgreSql

Question

我在MySql数据库上运行Heroku应用程序。 现在由于某种原因我想切换到PostgreSql。为此，我更改了database.yml并根据PostgreSql的要求更改了我的迁移文件。 我还为同一应用程序更改了DATABASE_URL和SHARED_DATABASE_URL。 但是，当我转到应用程序时，它崩溃了。

Heroku：显示以下错误的日志

/disk1/home/slugs/181380_0fa1c59_dfd1-7eadaa54-533c-4617-b1de-bf74852a7afe/mnt/config/../vendor/rails/railties/lib/initializer.rb:271:in `require_frameworks': can't activate rack (~> 1.0.0, runtime) for [], already activated rack-1.1.0 for ["thin-1.2.6"] (RuntimeError)
    from /disk1/home/slugs/181380_0fa1c59_dfd1-7eadaa54-533c-4617-b1de-bf74852a7afe/mnt/config/../vendor/rails/railties/lib/initializer.rb:134:in `process'
    from /disk1/home/slugs/181380_0fa1c59_dfd1-7eadaa54-533c-4617-b1de-bf74852a7afe/mnt/config/../vendor/rails/railties/lib/initializer.rb:113:in `send'
    from /disk1/home/slugs/181380_0fa1c59_dfd1-7eadaa54-533c-4617-b1de-bf74852a7afe/mnt/config/../vendor/rails/railties/lib/initializer.rb:113:in `run'
    from /disk1/home/slugs/181380_0fa1c59_dfd1-7eadaa54-533c-4617-b1de-bf74852a7afe/mnt/config/environment.rb:9
    from /usr/ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
    from /usr/ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
    from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/thin-1.2.6/lib/rack/adapter/rails.rb:42:in `load_application'
    from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/thin-1.2.6/lib/rack/adapter/rails.rb:23:in `initialize'
    from /home/heroku_rack/heroku.ru:29:in `new'
    from /home/heroku_rack/heroku.ru:29
    from /home/slugs/181380_0fa1c59_dfd1-7eadaa54-533c-4617-b1de-bf74852a7afe/mnt/.gems/gems/rack-1.1.0/lib/rack/builder.rb:46:in `instance_eval'
    from /home/slugs/181380_0fa1c59_dfd1-7eadaa54-533c-4617-b1de-bf74852a7afe/mnt/.gems/gems/rack-1.1.0/lib/rack/builder.rb:46:in `initialize'
    from /home/slugs/181380_0fa1c59_dfd1-7eadaa54-533c-4617-b1de-bf74852a7afe/mnt/.gems/gems/rack-1.1.0/lib/rack/builder.rb:63:in `new'
    from /home/slugs/181380_0fa1c59_dfd1-7eadaa54-533c-4617-b1de-bf74852a7afe/mnt/.gems/gems/rack-1.1.0/lib/rack/builder.rb:63:in `map'
    from /home/heroku_rack/heroku.ru:18
    from /home/slugs/181380_0fa1c59_dfd1-7eadaa54-533c-4617-b1de-bf74852a7afe/mnt/.gems/gems/rack-1.1.0/lib/rack/builder.rb:46:in `instance_eval'
    from /home/slugs/181380_0fa1c59_dfd1-7eadaa54-533c-4617-b1de-bf74852a7afe/mnt/.gems/gems/rack-1.1.0/lib/rack/builder.rb:46:in `initialize'
    from /home/heroku_rack/heroku.ru:11:in `new'
    from /home/heroku_rack/heroku.ru:11
    from /home/slugs/181380_0fa1c59_dfd1-7eadaa54-533c-4617-b1de-bf74852a7afe/mnt/.gems/gems/rack-1.1.0/lib/rack/builder.rb:46:in `instance_eval'
    from /home/slugs/181380_0fa1c59_dfd1-7eadaa54-533c-4617-b1de-bf74852a7afe/mnt/.gems/gems/rack-1.1.0/lib/rack/builder.rb:46:in `initialize'
    from /home/heroku_rack/heroku.ru:1:in `new'
    from /home/heroku_rack/heroku.ru:1

==> dyno-1284675.log (crash) <==
/disk1/home/slugs/181380_0fa1c59_dfd1-7eadaa54-533c-4617-b1de-bf74852a7afe/mnt/config/../vendor/rails/railties/lib/initializer.rb:271:in `require_frameworks': can't activate rack (~> 1.0.0, runtime) for [], already activated rack-1.1.0 for ["thin-1.2.6"] (RuntimeError)
    from /disk1/home/slugs/181380_0fa1c59_dfd1-7eadaa54-533c-4617-b1de-bf74852a7afe/mnt/config/../vendor/rails/railties/lib/initializer.rb:134:in `process'
    from /disk1/home/slugs/181380_0fa1c59_dfd1-7eadaa54-533c-4617-b1de-bf74852a7afe/mnt/config/../vendor/rails/railties/lib/initializer.rb:113:in `send'
    from /disk1/home/slugs/181380_0fa1c59_dfd1-7eadaa54-533c-4617-b1de-bf74852a7afe/mnt/config/../vendor/rails/railties/lib/initializer.rb:113:in `run'
    from /disk1/home/slugs/181380_0fa1c59_dfd1-7eadaa54-533c-4617-b1de-bf74852a7afe/mnt/config/environment.rb:9
    from /usr/ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
    from /usr/ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
    from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/thin-1.2.6/lib/rack/adapter/rails.rb:42:in `load_application'
    from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/thin-1.2.6/lib/rack/adapter/rails.rb:23:in `initialize'
    from /home/heroku_rack/heroku.ru:29:in `new'-----> Heroku receiving push
-----> Rails app detected
       Compiled slug size is 15.3MB
-----> Launching.... done
    from /home/heroku_rack/heroku.ru:29
    from /home/slugs/181380_0fa1c59_dfd1-7eadaa54-533c-4617-b1de-bf74852a7afe/mnt/.gems/gems/rack-1.1.0/lib/rack/builder.rb:46:in `instance_eval'
    from /home/slugs/181380_0fa1c59_dfd1-7eadaa54-533c-4617-b1de-bf74852a7afe/mnt/.gems/gems/rack-1.1.0/lib/rack/builder.rb:46:in `initialize'
    from /home/slugs/181380_0fa1c59_dfd1-7eadaa54-533c-4617-b1de-bf74852a7afe/mnt/.gems/gems/rack-1.1.0/lib/rack/builder.rb:63:in `new'
    from /home/slugs/181380_0fa1c59_dfd1-7eadaa54-533c-4617-b1de-bf74852a7afe/mnt/.gems/gems/rack-1.1.0/lib/rack/builder.rb:63:in `map'
    from /home/heroku_rack/heroku.ru:18
    from /home/slugs/181380_0fa1c59_dfd1-7eadaa54-533c-4617-b1de-bf74852a7afe/mnt/.gems/gems/rack-1.1.0/lib/rack/builder.rb:46:in `instance_eval'
    from /home/slugs/181380_0fa1c59_dfd1-7eadaa54-533c-4617-b1de-bf74852a7afe/mnt/.gems/gems/rack-1.1.0/lib/rack/builder.rb:46:in `initialize'
    from /home/heroku_rack/heroku.ru:11:in `new'
    from /home/heroku_rack/heroku.ru:11
    from /home/slugs/181380_0fa1c59_dfd1-7eadaa54-533c-4617-b1de-bf74852a7afe/mnt/.gems/gems/rack-1.1.0/lib/rack/builder.rb:46:in `instance_eval'
    from /home/slugs/181380_0fa1c59_dfd1-7eadaa54-533c-4617-b1de-bf74852a7afe/mnt/.gems/gems/rack-1.1.0/lib/rack/builder.rb:46:in `initialize'
    from /home/heroku_rack/heroku.ru:1:in `new'
    from /home/heroku_rack/heroku.ru:1

-----> An error happened during the initialization of your app.

       This may be due to a typo, wrong number of arguments, or calling a
       function that doesn't exist.

       Make sure the app is working locally in production mode, by running it
       with RAILS_ENV (for Rails apps) or RACK_ENV (for Sinatra or other rack
       apps) set to production. e.g. RAILS_ENV=production script/server.

       Examine the backtrace above this message to debug.

==> cron-2153255.log (crash) <==
(in /disk1/home/slugs/181380_b09ba5c_aaf3-ed376a4c-936a-459f-b8c8-3111c45124e1/mnt)
config.gem: Unpacked gem CVS in vendor/gems has no specification file. Run 'rake gems:refresh_specs' to fix this.
config.gem: Unpacked gem CVS in vendor/gems not in a versioned directory. Giving up.
rake aborted!
undefined method `serve_static_assets=' for #<Rails::Configuration:0x2aec8dff9cc8>

(See full trace by running task with --trace)

-----> Your application crashed.

       Examine the backtrace above this message to debug.

我希望在通过数据库切换Heroku或如何避免上述错误时要遵循的步骤。

编辑：-

我的.gems文件如下

rails -v 2.3.8
spreadsheet --version 0.6.4
spreadsheet-excel --version 0.3.5.1
rack --version 1.1.0
money --version 2.2.0
fastercsv --version 1.5.3
xml-mapping --version 0.8.1

当我更改``机架-版本1.1.0''或``机架-版本1.0.0''时，它会给出相同的错误

问候，

萨里尔·盖克瓦德（Salil Gaikwad）

Answer 1

我不知道为什么，但是在config / environments / production.rb中的以下行注释掉后，它可以工作

config.serve_static_assets = true

现在我想知道注释是否会在将来出现问题？ 并且该代码的用途是什么？