The Little Engines That Could
summary
A mountable Rails engine called critic is bootstrapped with the plugin generator, producing lib/critics.rb and lib/critic/engine.rb, a critics.gemspec, namespaced models under critic/models, and a bare‑bones test app for isolated specs. Tests set routes to the engine, and the host includes the engine in its Gemfile (or local path) then mounts it at /reviews. Engines run only inside hosts, help reduce cognitive load and shrink test scope, and differ from gems and plugins by containing Rails MVC pieces and using an isolated namespace when mountable.
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