When designing a multi-tenant architecture for your SaaS app, you need to provide a safe solution for tenants. In other words, you need to safely separate each tenant’s data. We’ll describe how to design the database layer and what Ruby gems you can use for multi-tenant Software as a Service applications. https://rubygarage.org/blog/three-database-architectures-for-a-multi-tenant-rails-based-saas-app