Rack Domain Filter

Prerequisites

• Ruby 2.1+

Installation

Put this into Gemfile:

gem 'rack-domain-filter'

Then run bundle.

Builder API

See Yarddoc for more information.

Usage

Suppose you have Company model. In Rails, you can do like this:

# Put this inside application.rb, or
# any environment file in config/environments/*.rb

Rack::DomainFilter.configure do |config|
  config.filter_for /(.+).local.dev/ do |slug|
    Thread.current[:company] = Company.find_by!(slug)
  end

  config.filter_for /(.+).peentar.id/ do |slug|
    Thread.current[:company] = Company.find_by!(slug)
  end

  config.filter_for /tenant-onpremise.ourclients.com/ do
    Thread.current[:company] = Company.find_by!(slug: 'tenant-onpremise.ourclients.com')
  end

  config.catch ActiveRecord::NotFound do
    [404, {}, "Not Found"]
  end

  config.no_match do
    [404, {}, "No slug found"]
  end

  config.after_request do
    Thread.current[:company] = nil
  end
end

config.middleware.use Rack::DomainFilter

In your controller, you can get your current company with this syntax:

class ApplicationController < ActionController::Base
  def current_company
    Thread.current[:company]
  end
end

def ApplicationHelper
  def current_company
    Thread.current[:company]
  end
end

You may want to put this into global filter. This is quick but dirty solution.

class ApplicationRecord < ActiveRecord::Base
  default_scope do
    if Thread.current[:company]
      where(company_id: Thread.current[:company].id)
    else
      nil
    end
  end
end

The best way to use this is to explictly ask Model to search in current company scope

class ApplicationRecord < ActiveRecord::Base
  scope :in_current_company, -> { where(company: Thread.current[:company]) }
end

class Manager < ApplicationRecord; end

@managers = Manager.in_current_company