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Editorial Team
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Asked: 2026-06-08T06:57:47+00:00

I’m trying to run some migrations on a database via Sequel’s Sequel::Migrator . However,

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I’m trying to run some migrations on a database via Sequel’s Sequel::Migrator. However, when I run…

DB = Sequel.sqlite
Sequel::Migrator.apply DB, 'db/migrations'

I got the following error.

uninitialized constant Sequel::Migrator

What gives?

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1 Answer

  1. Editorial Team

    Nowadays Sequel::Migrator is not included by default. This means that you just can’t require 'sequel' and be able to start using Sequel::Migrator right away.

    Instead you have to load the migration and core extensions provided by Sequel like so.

    Sequel.extension :migration, :core_extensions

    Now if you check whether Sequel::Migrator is defined Ruby should return "constant".

    1.9.3 :001 > Sequel.extension :migration, :core_extensions
 => [:migration, :core_extensions]
1.9.3 :002 > defined? Sequel::Migrator
 => "constant"
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