Rails 7 moves ActiveRecord::Base.logger to a class_attribute leading to a 7x speed improvementRails 7 utilized Ruby's cache for cvars to improve ActiveRecord::Base.logger performance 7x. Let's deep dive into this!
ActiveRecord::Calculations will now use column-based type castingRails 7 now harmonizes results of ActiveRecord::Calculations.average by applying column-based typecasting. Now, floating-point number columns will be aggregated as Float.
Rails 7 allows setting cache expiry, as an absolute timestampWith the introduction of expires_at to Rails Cache it is now possible to set absolute timestamps for cache expiry.
Rails 7 adds change tracking methods for belongs_to associationsRails 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.
Rails 7 allows loading nested locales in the engineRails 7 allows loading nested locales inside the `/locales` directory by default for better organization in larger apps.
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 valuesMySQL adapter in Rails 7 casts numbers and booleans to string to avoid security vulnerabilities.
Rails 7 adds previously_persisted? method to ActiveRecordRails 7 adds previously_persisted? method to check an object previously existed in the database and presently deleted.
Rails 7 adds AudioAnalyzer to ActiveStorageRails 7 adds AudioAnalyzer to ActiveStorage to extract audio duration and bit_rate.
Rails 7 generators will raise errors if an attribute type is invalidRails 7 generators will validate the type by checking if it is of a default migration type and will raise an error if it is invalid.