Rails 7 adds change tracking methods for belongs_to associations
Rails 7 adds the ability to track if an association has been pointed to a new target record in the previous save and whether it will point to a new target record in the next save.
React 18 adds automatic batching
React 18 adds out-of-the-box performance improvements by doing more batching by default.
Rails 7 allows loading nested locales in the engine
Rails 7 allows loading nested locales inside the `/locales` directory by default for better organization in larger apps.
React 18 introduces new root API ( ReactDOM.createRoot )
React 18 adds the new root API that comes up with the new out-of-the-box improvements.
Rails 7 adds support for `if_exists/if_not_exists` on `remove_foreign_key/add_foreign_key`
Rails 7 adds support for `if_exists/if_not_exists` on `remove_foreign_key/add_foreign_key` in migrations to silently ignore raised exceptions.
Rails 7 MySQL adapter improves the security of untyped bound values
MySQL adapter in Rails 7 casts numbers and booleans to string to avoid security vulnerabilities.
React 17 attaches events to the root DOM container instead of the document node
React 17 delegates events to the root node instead of the document node, making it easier to embed React into apps built with other technologiesRuby 3.1 introduces pattern matching pin operator against expression
Ruby 3.1 adds support for the expression and range when using the pattern matching pin operator.
Rails 7 adds previously_persisted? method to ActiveRecord
Rails 7 adds previously_persisted? method to check an object previously existed in the database and presently deleted.
React 17 introduces new JSX transform
React 17 introduces jsx-runtime and jsx-dev-runtime that enables the user to write JSX without importing React.