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alex shapalov Profile picture
alex shapalov
@alxshp
Building ActiveRabbit 🐇 open-source to $10k MRR — $529/mo 🚀 @Remotely_jobs 100k+ users • Daily vibe-coded builds & revenue • 🇺🇦→🇺🇸
Dec 3 • 9 tweets • 4 min read
37signals open-sourced Fizzy, their Kanban tracker for issues & ideas. @dhh

I went through the code and stole 10 patterns you can reuse in your own Rails / SaaS app 👇

github.com/basecamp/fizzy 1️⃣ Account slug multi-tenancy (no namespaced controllers)

Fizzy uses a rack middleware (AccountSlug::Extractor) that:

Pulls the numeric account id from the URL
Rewrites SCRIPT_NAME / PATH_INFO
Wraps the request in Current.with_account

Result: the whole app is effectively mounted at /{account_id} and controllers stay clean & non-multi-tenant-aware.Image