title: yaml_db Not Working When Dumping the Database
body: <p>I'm trying to convert  my rubyonrails project from sqlite3 to MySQL by following:</p>
  
  <ul>
  <li><a href="https://stackoverflow.com/questions/1670154/convert-a-ruby-on-rails-app-from-sqlite-to-mysql">Convert a Ruby on Rails app from sqlite to MySQL?</a></li>
  <li><a href="https://github.com/ludicast/yaml_db" rel="nofollow noreferrer">https://github.com/ludicast/yaml_db</a></li>
  </ul>
  
  <p>Here is the command line log:</p>
  
  <pre><code>plee@sos:~/rubyonrails/blog$ gem install yaml_db
  Successfully installed yaml_db-0.2.3
  1 gem installed
  Installing ri documentation for yaml_db-0.2.3...
  Installing RDoc documentation for yaml_db-0.2.3...
  
  plee@sos:~/rubyonrails/blog$ gem list | grep yaml_db
  yaml_db (0.2.3)
  
  plee@sos:~/rubyonrails/blog$ rake db:data:dump
  rake aborted!
  Don't know how to build task 'db:data:dump'
  
  (See full trace by running task with --trace)
  
  plee@sos:~/rubyonrails/blog$ rake db:dump
  rake aborted!
  Don't know how to build task 'db:dump'
  
  (See full trace by running task with --trace)
  plee@sos:~/rubyonrails/blog$ 
  </code></pre>
  
  <p>and my OS info:</p>
  
  <pre><code>plee@sos:~/rubyonrails/blog$ uname -a
  Linux sos 2.6.38-15-generic-pae #60-Ubuntu SMP Tue May 22 11:48:17 UTC 2012 i686 i686 i386 GNU/Linux
  plee@sos:~/rubyonrails/blog$ lsb_release -a
  No LSB modules are available.
  Distributor ID: Ubuntu
  Description:    Ubuntu 11.04
  Release:    11.04
  Codename:   natty
  </code></pre>