Hi, this is Greg, bringing you this week’s changes in the Rails codebase.

Support preloading associations with composite keys
This pull request adds support for Associations::Preloader to be able to preload associations associated by a composite foreign key (query_constraints) and by implication adds support for includes() relations.

SchemaCache#init_with skip deduplicate if specified
This is a very advanced API for people who use a custom Schema Cache serializer, and since the custom serializer might already deduplicate data, in which case going through deduplication again would be very wasteful.

Rename Dockerfile user to “rails”
While a tiny detail, this change lets anyone know who is using this container that they are in a “rails” image, as opposed to a generic “appuser” which may conflict with other images.

Add rake task to vendor guide javascript
The Rails guides were migrated from Turbolinks to Turbo, and this commit adds a rake task to automate the process of grabbing the turbo js file using Importmap::Packager, which is what importmap-rails uses for bin/importmap pin –download.

You can view the whole list of changes here.
We had 30 contributors to the Rails codebase this past week!

Until next time!