Leases

Database multi-tenancy for Rails.

Supported Rails versions

• Rails 3.2.x
• Rails 4.0.x
• Rails 4.1.x
• Rails 4.2.x

Supported Ruby versions

• Ruby 2.0.0
• Ruby 2.1.1
• Ruby 2.2.1

Installation

Add this line to your Gemfile and run bundle.

gem 'leases'

Usage

# app/models/account.rb
class Account < ActiveRecord::Base
  leases
end

# app/controllers/application_controller.rb
class ApplicationController < ActionController::Base
  visit_as :current_account

  protected

  def current_account
    Account.find(params[:account_id])
  end
end

That's it. Now you have a fully multi-tenant app.

More

# app/models/account.rb
class Account < ActiveRecord::Base

  # Customize the leaser name (used for the database name)
  leases :name => :slug
  leases :name => Proc.new { |c| "acount_#{c.id}" }

  # Callbacks
  on_enter :set_something     # => Called on :enter (part of visit)
  on_leave :clear_something   # => Called on :leave (part of visit)

  on_lease :create_something  # => Called on new lease
  on_break :delete_something  # => Called on break of lease

end

account = Account.create :name => 'John Doe' # => Calls account.lease! and sets up database 'account-1'

account.enter # => Switches to database 'account-1'
account.leave # => Switches back to regular database

account.visit do
  # You are now in account database context
  # Context is automatically cleared after visit
end

account.destroy # => Calls account.break! and deletes leaser database

Shared models

By default only the leaser model is a shared model. The rest is stored in a separate database. There may be situations in which you want to have more shared models, such as a User model. You can configure this as such:

# app/models/user.rb
class User < ActiveRecord::Base
  shared_by_leasers
end

Under the hood

We're using apartment for managing and switching databases. This is a fantastic gem that you should check out: https://github.com/influitive/apartment. Apartment supports MySQL and PostgreSQL.

Background processing

We recommend using apartment-sidekiq to process background jobs (https://github.com/influitive/apartment-sidekiq). This is a zero-configuration gem that enables background processing in a tenant context.

Doing it yourself is also possible, here is a simple example:

class SomeWorker
  def some_process(account_id)
    Account.find(account_id).visit do
      # Your processing here
    end
  end
end

Migrating

rake apartment:migrate

This will migrate all leaser databases.

Other solutions

If you're looking for multi-tenancy without having multiple databases then you should check out acts_as_tenant: https://github.com/ErwinM/acts_as_tenant.

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request