Relations is a gem to generate associations between models in a Rails application. With a simple command you can generate the migration and add the associations to the models involved.

You can use relations gem with any rails version major to 3.0:

gem install relations

After you install Relations and add it to your Gemfile, you could use it in the following way:

rails generate relation model_one relation_type model_two

• Both models should be created before you can generate the relation.

• Both model’s names should be in the singular form.

• Sopported Relations types:

has_many
belongs_to
has_one
has_and_belongs_to_many

For instance:

rails g relation user has_many task

It should:

* generate a migration “db/migration/***_relate_users_to_tasks.rb”

* add “has_many :tasks” line to app/models/user.rb

* add “belongs_to :user” line to app/models/task.rb

• Alvaro Muhlethaler (github.com/vairix-amuhlethaler)

• Sebastián Sierra (github.com/vairix-ssierra)

MIT License. Copyright 2011 VAIRIX Software Development. www.vairix.com