Merb plugin that provides support for Sequel and Sequel::Model.
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A plug-in for the Merb framework that provides support for Sequel models.

If you use my fork on please use again the official repository on I'm now updating the official repository.

Plug-in is compatible with Merb 0.9.9 and higher and Sequel 2.7.0 and higher including 2.x.x and 3.x.x.

Any issues please report to


Since 1.0.9 you can install official Merb gem:

gem install merb_sequel –source

Following gems are RETIRED!!!

Since version 1.0.6 I've moved gem hosting to Gemcutter. So now you need to install gem with:

gem install pk-merb_sequel –source

For versions <= 1.0.5 I used GitHub:

gem install pk-merb_sequel –source

Merb < 1.1

Add merb_sequel as a dependency to your config/dependencies.rb:

dependency 'merb_sequel'

Merb >= 1.1, add it as a dependency to your Gemfile:

gem 'merb_sequel'

Add Sequel as you ORM of choice to init.rb:

use_orm :sequel

Merb >= 1.2, add it as a dependency to your Gemfile:

gem 'merb_sequel'

To activate the gem and set all needed to use Sequel just use:

require 'merb_sequel'


Ruby 1.8.7:

Sequel 2.11.0

All pass

Sequel 2.12.0

All pass

Sequel 3.0.0

All pass

Sequel 3.5.0

All pass

Sequel 3.6.0

All pass

Ruby 1.9.1:

Sequel 2.11.0

All pass

Sequel 2.12.0

All pass

Sequel 3.0.0

All pass

Sequel 3.5.0

All pass

Sequel 3.6.0

All pass

ActiveModel compatibility

In Merb > 1.0.13 we use ActiveModel interface for the ORM plugins. merb_sequel now supports this for all versions of Sequel by including compatibilit layers by default or loading active model plugin when using Sequel > 3.5.0

You can use configuration to not load compatibility layer: Merb::Plugins.config[:load_activemodel_compatibility] = false

RSpec transactional examples

If you want to cut significantly runtime of your test suite which is using Sequel you can enable transactional examples. Just add following line to your spec_helper.rb or any spec you want to be transactional:

require 'merb_sequel/rspec/sequel'

Now each example is wrapped in a Sequel transaction and when example finishes Sequel::Error::Rollback is raised which cause transaction to rollback.

Connection options & Settings


  • :load_activemodel_compatibility. By default is set to true. If set to false, ActiveModelCompatibility is not loaded.

Merb Sequel plug-in uses config/database.yml for connection configuration.

Options are:

  • adapter. :sqlite is assumed by default.

  • database, default is “hey_dude_configure_your_database”. In case of SQLite this should be either :memory: or file path for SQLite.

  • db_type: default is nil. Use “mssql” to connect to MSSQL using ODBC.

  • encoding or charset, default is utf8.

  • host. localhost is assumed by default.

  • logger default is Merb.logger

  • password. WARNING: default password is an empty string.

  • socket Use socket to connect to DB.

  • username or user, default is an empty string


After you install the plug-in, merb-gen can generate Sequel models for you:

merb-gen model --orm=sequel Article

same with the resources

merb-gen resource --orm=sequel Article

Note that if you have specified that you use Sequel in init.rb or environment specific init file (for instance, environments/development.rb) via use_orm :sequel, you don't need to specify –orm option explicitly when using merb-gen.


Originally written by Duane Johnson (canadaduane at

Contributions by:

  • Wayne E. Seguin

  • Lance Carlson

  • Jacob Dunphy

  • Lori Holden

  • Pavel Kunc

  • e-mac

  • Piotr Usewicz

Maintained by Pavel Kunc (pavel.kunc at