Row-Level Multitenancy in Rails: Building a Bulletproof Tenant Isolation Layer from Scratch

Short summary

This tutorial builds a production-grade row-level multitenancy system in Rails from first principles, covering subdomain-based tenant resolution, CurrentAttributes-based request context, PostgreSQL row-level security, and safety patterns for background jobs. Includes complete code examples for middleware, migrations, and model concerns that prevent data leaks at both application and database layers. No gems required—just Rails, PostgreSQL, and architectural patterns for bulletproof tenant isolation.

• •Complete Rails multitenancy architecture from scratch with migrations, middleware, and model concerns
• •Dual-layer tenant isolation via application scoping and PostgreSQL row-level security
• •Safety patterns for background jobs, validations, and request-scoped context using ActiveSupport::CurrentAttributes

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