Ruby on Rails documentation updates

ruby/sqlcommenter-ruby/README.md

@@ -1 +1,19 @@
-# sqlcommenter-ruby
+# SQLCommenter in Ruby
+
+## SQLCommenter support in Rails
+
+
+Support for [SQLCommenter](https://google.github.io/sqlcommenter/) in [Ruby on Rails](https://rubyonrails.org/) varies, depending on your versions of Rails.
+
+If you are on Rails version:
+
+ - **7.1 and above:** SQLCommenter is supported by default. Enable [query_log_tags](https://guides.rubyonrails.org/configuring.html#config-active-record-query-log-tags-enabled), and SQLCommenter formatting will be [enabled by default](https://edgeguides.rubyonrails.org/configuring.html#config-active-record-query-log-tags-format).
+ - **7.0:** Enable [query_log_tags](https://guides.rubyonrails.org/configuring.html#config-active-record-query-log-tags-enabled) and install the [PlanetScale SQLCommenter gem](https://github.com/planetscale/activerecord-sql_commenter#installation) for SQLCommenter support.
+ - **Below 7.0:** Refer to the [sqlcommenter_rails gem](https://github.com/google/sqlcommenter/tree/master/ruby/sqlcommenter-ruby/sqlcommenter_rails) in this directory for adding SQLCommenter support. Note that this requires additional work because you will have to install a fork of the [marginalia](https://github.com/basecamp/marginalia/) gem, which has since been consolidated into Rails 7.0 and up.
+
+## Tracing support in Rails
+
+Tracing support has been implemented in the [marginalia-opencensus gem]: https://github.com/google/sqlcommenter/tree/master/ruby/sqlcommenter-ruby/marginalia-opencensus. Note that this only works for Rails versions below 7.0, before the [marginalia](https://github.com/basecamp/marginalia/) gem was consolidated into Rails.
+
+Re-purposing that gem for Rails versions >=7.0 should only require minor modifications (contributions are welcome!).
+

ruby/sqlcommenter-ruby/sqlcommenter_rails/README.md

@@ -1,5 +1,7 @@
 # sqlcommenter_rails
 
+**If you are on Rails version 7.0 and up, refer to the [sqlcommenter-ruby README] instead**
+
 [sqlcommenter] for [Ruby on Rails].
 
 Powered by [marginalia] and [marginalia-opencensus].
@@ -8,6 +10,7 @@ Powered by [marginalia] and [marginalia-opencensus].
 [Ruby on Rails]: https://rubyonrails.org/
 [marginalia]: https://github.com/basecamp/marginalia/
 [marginalia-opencensus]: https://github.com/google/sqlcommenter/tree/master/ruby/sqlcommenter-ruby/marginalia-opencensus
+[sqlcommenter-ruby README]: https://github.com/google/sqlcommenter/tree/master/ruby/sqlcommenter-ruby
 
 ## Installation
 

ruby/sqlcommenter-ruby/sqlcommenter_rails_demo/README.md

@@ -1,9 +1,12 @@
 # sqlcommenter_rails demo
 
+**If you are on Rails version 7.0 and up, refer to the [sqlcommenter-ruby README] instead**
+
 This is a demo [Rails API] application to demonstrate [sqlcommenter_rails] integration.
 
 [Rails API]: https://guides.rubyonrails.org/api_app.html
 [sqlcommenter_rails]: https://github.com/google/sqlcommenter/ruby/sqlcommenter-ruby/sqlcommenter_rails
+[sqlcommenter-ruby README]: https://github.com/google/sqlcommenter/tree/master/ruby/sqlcommenter-ruby
 
 ## Setup