Rails

ActiveStorage now raises a PreviewError when previews fail to generate

Before this update, a failed preview generation would result in a 0-byte file being created – leading to disastrous outcomes in the views.

Rails 7 moves ActiveRecord::Base.logger to a class_attribute leading to a 7x speed improvement

Rails 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 casting

Rails 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 timestamp

With 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 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.

Rails 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 values

MySQL adapter in Rails 7 casts numbers and booleans to string to avoid security vulnerabilities.

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.

Rails 7 adds AudioAnalyzer to ActiveStorage

Rails 7 adds AudioAnalyzer to ActiveStorage to extract audio duration and bit_rate.