Moderne is an open-source company building automated source code transformations for framework migrations, vulnerability patches, and API migrations. Explore the platform here.

OpenRewrite is a community-driven open source project that consists of an auto-refactoring engine that runs prepackaged refactoring recipes for common framework migrations, security fixes, and stylistic consistency tasks.

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Props to Stack Overflow user Benjamin Atkin, who earned a Populist badge by offering up some wisdom on Rails - How to refresh an association after a save.