Merge pull request rails#191 from rails/import-this-week-in-rails

import this week in Rails

_posts/2023-10-20-this-week-in-rails.markdown

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+---
+layout: post
+title: "Rails World talks online, fix of a 13 years old bug and more!"
+categories: news
+author: Greg Molnar
+published: true
+date: 2023-10-20
+---
+
+Hi, it's [Greg](https://greg.molnar.io), bringing you this week's changes in the Rails codebase.
+
+[Rails World talks are online](https://www.youtube.com/watch?v=9RZVdXyzwCw&list=PLHFP2OPUpCeY9IX3Ht727dwu5ZJ2BBbZP)  
+The talks from Rails World 2023 are now available to watch online!  You can watch all of them on the YouTube playlist.  
+Also, Amanda Perino wrote [a recap of Rails World](https://rubyonrails.org/2023/10/19/rails-world-2023-recap).
+
+[Do not memoize auto/eager load paths in engines](https://github.com/rails/rails/pull/49636)  
+This pull request fixes an issue from 13 years ago. In a Rails engine, if you manipulate the auto/eager load paths like this:
+```ruby
+config.eager_load_paths << "#{Rails.root}/extras"
+config.paths["app/helpers"] << "#{Rails.root}/custom/helpers"
+```
+Then custom/helpers would not end up in the autoload and eager load paths. In newly generated Rails 7.1 applications lib is pushed to to `config.eager_load_paths`. If they are used together with something that edits `config.paths` afterwards, that latent bug now surfaces. I guess this combination, while possible, was not happening much in practice until now.
+
+[Raise on _foreign_key:_ being passed as an array in associations](https://github.com/rails/rails/pull/49625)  
+Associations have never allowed nor supported `foreign_key` option being passed as an _Array_. This still holds true for Rails 7.1. However, with support for composite primary keys it may become more common for applications to mistakenly pass an array to `foreign_key:`. With this commit, an exception is raised when `foreign_key:` is passed as an array.
+
+[Fix _capture_ view helper for HAML and Slim](https://github.com/rails/rails/pull/49612)  
+When a blank string is captured in HAML or Slim (and possibly other template engines) it returns an entire buffer. This pull request fixes that.
+
+_You can view the whole list of changes [here](https://github.com/rails/rails/compare/@%7B2023-10-13%7D...main@%7B2023-10-20%7D)._  
+_We had [26 contributors](https://contributors.rubyonrails.org/contributors/in-time-window/20231013-20231020) to the Rails codebase this past week!_
+
+Until next time!
+
+_[Subscribe](https://world.hey.com/this.week.in.rails) to get these updates mailed to you._