Upgrading

2.7 to 3.0
2.3 to 2.4

2.7 to 3.0

Keep your react_ujs up to date: yarn upgrade
Drop support for Webpacker: Before any ReactRails upgrade, make sure upgrading from Webpacker to Shakapacker 7. For more information check out Shakapacker
SSR: ReactRails 3.x requires separate compilations for server & client bundles. See Webpack config directory in the dummy app to addapt the new implementation.

2.3 to 2.4

Keep your react_ujs up to date, yarn upgrade

React-Rails 2.4.x uses React 16+ which no longer has React Addons. Therefore the pre-bundled version of react no longer has an addons version, if you need addons still, there is the 2.3.1+ version of the gem that still has addons.

If you need to make changes in your components for the prebundled react, see the migration docs here:

https://reactjs.org/blog/2016/11/16/react-v15.4.0.html
https://reactjs.org/blog/2017/04/07/react-v15.5.0.html
https://reactjs.org/blog/2017/06/13/react-v15.6.0.html

For the vast majority of cases this will get you most of the migration:

global find+replace React.Prop -> Prop
add import PropTypes from 'prop-types' (Webpacker only)
re-run bundle exec rails webpacker:install:react to update npm packages (Webpacker only)

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