Rails 7 introduces ActiveModel::APIActiveModel::API allows adding more functionality to ActiveModel::Model and makes itself a minimum API to interact with Action Pack and Action View.
Rails 7 supports NullsFirst for all databasesDevelopers can now access Arel methods for null column ordering.
ECMAScript2021 adds new features WeakRef and FinalizationRegistryECMAScript2021 introduces new features WeakRef and FinalizationRegistry to manage garbage collection.
Rails 7 adds SSL support for postgresql in bin/rails dbconsoleRails 7 added PGSSLMODE, PGSSLCERT, PGSSLKEY, and PGSSLROOTCERT to DBConsole class to load SSL-related environment variables from database config when running bin/rails dbconsole with postgresql.
Rails 7 adds ActiveRecord::QueryMethods#in_order_of to return query results in a particular sequenceStarting with Rails 7, we can return ActiveRecord::Relation results in provided series using the in_order_of method.
React DevTools adds a feature to trigger an error boundary, making testing easierA new enhancement in React DevTools provides a toggle error button to test Error Boundaries.
Rails 7 replaced byebug with ruby/debugRails 7 removed byebug from their default debugger and replaced it with ruby/debug.
Ruby 3.1 allows value omission in hash literalsRuby 3.1 adds the ability to use hash literals without having a value.
Normalizing Redux state to ensure good performance in React appsIn complex applications, client apps have to store and manage a large amount of nested data, and if the data is not normalized, it can be incredibly time-consuming for a program to lookup nested data which could become a performance concern.