Found an answer. 
http://stackoverflow.com/questions/11605970/sequel-migrator-not-defined

On Thursday, November 22, 2012 8:57:05 PM UTC-6, venkat wrote:
>
> Hi
>
>      I am trying to create a rake task to run migrations. I was able to do 
> the following. But this is actually using the bin/sequel tool. 
>
>  sh %{sequel -m db/migrations 
> postgres://postgres:postgres@localhost:5432/bookmarks}
>
> Is there a way to run the migrations like ruby code ? I tried the 
> following, but it throws an error.
>
> Sequel::Migrator.run(DB, 'db/migrations')
>
> rake aborted!
> uninitialized constant Sequel::Migrator
> /home/venkat/Projects/bookmarks/Rakefile:14:in `block in <top (required)>'
> /home/venkat/.rvm/gems/ruby-1.9.3-p194/bin/ruby_noexec_wrapper:14:in `eval'
> /home/venkat/.rvm/gems/ruby-1.9.3-p194/bin/ruby_noexec_wrapper:14:in 
> `<main>'
> Tasks: TOP => migrate
> (See full trace by running task with --trace)
>
>
> Thanks in advance.
>
>
>

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