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.

# 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.

Contributing

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

Arjeno/leases