Merge pull request #227 from zzak/twir-2024-02-09

twir-2024-02-09

Author: zzak

_posts/2024-02-09-this-week-in-rails.markdown

@@ -0,0 +1,56 @@
+---
+layout: post
+title: "Rails Foundation Docs, Query Logs source_location, Dockerfile gets jemalloc"
+categories: news
+author: zzak
+og_image: assets/images/this-week-in-rails.png
+published: true
+date: 2024-02-09
+---
+
+
+Hi, it's [zzak](https://github.com/zzak). Let's explore this week's changes in the Rails codebase.
+
+[Rails Foundation Docs](https://github.com/rails/rails/pulls?q=is%3Apr+is%3Aopen+label%3A%22rails+foundation%22)  
+A team has been [formed](https://rubyonrails.org/2024/2/6/documentation-update-work-has-begun) to improve the existing Rails documentation. PRs from this project will stay open for one week for community review. Open this week:
+* ActiveJob.perform_all_later
+* Action Text
+* Action Mailbox
+
+More to come!
+
+[Properly synchronize `Mysql2Adapter#active?` and `TrilogyAdapter#active?`](https://github.com/rails/rails/pull/51012)  
+As well as `disconnect!` and `verify!`.  
+This generally isn't a big problem as connections must not be shared between threads, but is required when running transactional tests or system tests and could lead to a SEGV.
+
+[Implement "Rails::TestUnitReporter#prerecord"](https://github.com/rails/rails/pull/50984)  
+By adding this method to Rails TestUnitReporter class, Minitest will pick it up and invoke it before invoking the test, allowing to print the test name in advance.  
+This is useful to debug slow and stuck tests by turning on verbose mode. This way the stuck test name is printed before the process deadlocks.
+
+[Fix JSON-encoding ActiveStorage::Filename](https://github.com/rails/rails/pull/50982)  
+This PR fixes a bug where quotes were missing from the filename, generating invalid json.
+
+```ruby
+JSON.generate(foo: ActiveStorage::Filename.new("bar.pdf")) # => '{"foo":bar.pdf}'
+```
+
+[Support `:source_location` tag option for query log tags](https://github.com/rails/rails/pull/50969)  
+This PR adds support for showing where a query is defined the Rails logs when using [Active Record Query Logs](https://api.rubyonrails.org/classes/ActiveRecord/QueryLogs.html).
+
+```ruby
+# application.rb
+config.active_record.query_log_tags_enabled = true
+config.active_record.query_log_tags = [ :source_location ]
+```
+
+[Setup jemalloc in default Dockerfile to optimize memory allocation](https://github.com/rails/rails/pull/50943)  
+Ruby's use of `malloc` can create [memory fragmentation problems](https://www.speedshop.co/2017/12/04/malloc-doubles-ruby-memory.html), especially when using multiple threads like Puma does.  
+Switching to an allocator that uses different patterns to avoid fragmentation can decrease memory usage by a substantial margin.  
+
+
+_You can view the whole list of changes [here](https://github.com/rails/rails/compare/@%7B2024-02-02%7D...main@%7B2024-02-09%7D)._
+_We had [18 contributors](https://contributors.rubyonrails.org/contributors/in-time-window/20240202-20240209) 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._