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The Ruby and Rails community linklog

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The Modular Monolith in Rails: Engines, Packwerk & Boundaries

by David Silva —

https://davidslv.uk/modular-monolith-rails/

A current (Rails 8, Zeitwerk) walk-through of enforcing boundaries inside a Rails monolith before reaching for microservices. It compares Engines vs Packwerk vs extracted gems vs services in a single matrix, covers what Zeitwerk does and doesn’t give you, sets out a safe incremental migration loop, and is honest about when not to bother. First-party runnable examples throughout. Written from the experience of decomposing a large production monolith into engines — feedback from people running this in anger is welcome. Disclosure: I wrote this and the free companion book it links to.

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