Add SQLite support in Ruby (#67)

Adds SQLite support in Ruby that's compatible with the main River
project in the same way that Postgres is.

Author: brandur

CHANGELOG.md

@@ -7,6 +7,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- Add SQLite support to the ActiveRecord and Sequel drivers, including current River JSONB storage, atomic bulk inserts, unique jobs, and notification-outbox writes. [PR #67](https://github.com/riverqueue/riverqueue-ruby/pull/67).
+
+### Changed
+
+- Stop pulling in `pg` as a hard dependency of either driver. Applications now select their database adapter by including `pg` for PostgreSQL or `sqlite3` for SQLite. [PR #67](https://github.com/riverqueue/riverqueue-ruby/pull/67).
+
 ## [0.10.1] - 2026-04-09
 
 ### Fixed

Gemfile

@@ -9,8 +9,10 @@ end
 
 group :test do
   gem "debug"
+  gem "pg"
   gem "rspec-core"
   gem "rspec-expectations"
   gem "riverqueue-sequel", path: "driver/riverqueue-sequel"
   gem "simplecov", require: false
+  gem "sqlite3"
 end

Gemfile.lock

@@ -7,7 +7,6 @@ PATH
   remote: driver/riverqueue-sequel
   specs:
     riverqueue-sequel (0.10.1)
-      pg (> 0, < 1000)
       sequel (> 0, < 1000)
 
 GEM
@@ -125,6 +124,8 @@ GEM
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.13.2)
     simplecov_json_formatter (0.1.4)
+    sqlite3 (2.9.6-arm64-darwin)
+    sqlite3 (2.9.6-x86_64-linux-gnu)
     standard (1.54.0)
       language_server-protocol (~> 3.17.0.2)
       lint_roller (~> 1.0)
@@ -172,11 +173,13 @@ PLATFORMS
 
 DEPENDENCIES
   debug
+  pg
   riverqueue!
   riverqueue-sequel!
   rspec-core
   rspec-expectations
   simplecov
+  sqlite3
   standard
   steep
 

driver/riverqueue-activerecord/Gemfile

@@ -9,7 +9,9 @@ end
 
 group :test do
   gem "debug"
+  gem "pg"
   gem "rspec-core"
   gem "rspec-expectations"
   gem "simplecov", require: false
+  gem "sqlite3"
 end

driver/riverqueue-activerecord/Gemfile.lock

@@ -9,7 +9,6 @@ PATH
     riverqueue-activerecord (0.10.1)
       activerecord (> 0, < 1000)
       activesupport (> 0, < 1000)
-      pg (> 0, < 1000)
 
 GEM
   remote: https://rubygems.org/
@@ -115,6 +114,8 @@ GEM
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.13.2)
     simplecov_json_formatter (0.1.4)
+    sqlite3 (2.9.3-arm64-darwin)
+    sqlite3 (2.9.3-x86_64-linux-gnu)
     standard (1.54.0)
       language_server-protocol (~> 3.17.0.2)
       lint_roller (~> 1.0)
@@ -146,11 +147,13 @@ PLATFORMS
 
 DEPENDENCIES
   debug
+  pg
   riverqueue!
   riverqueue-activerecord!
   rspec-core
   rspec-expectations
   simplecov
+  sqlite3
   standard
 
 BUNDLED WITH

driver/riverqueue-activerecord/README.md

@@ -1,8 +1,3 @@
-# River Ruby bindings ActiveRecord driver
+# riverqueue-activerecord
 
-A future home for River's Ruby bindings. For now, the [Gem is registered](https://rubygems.org/gems/riverqueue), but nothing else is done.
-
-``` sh
-$ gem build riverqueue-activerecord.gemspec
-$ gem push riverqueue-activerecord-0.0.1.gem
-```
+See the [ActiveRecord driver documentation](./docs/README.md).

driver/riverqueue-activerecord/docs/README.md

@@ -1,22 +1,48 @@
-#  riverqueue-sequel [![Build Status](https://github.com/riverqueue/riverqueue-ruby-sequel/workflows/CI/badge.svg)](https://github.com/riverqueue/riverqueue-ruby-sequel/actions)
+# riverqueue-activerecord
 
-[ActiveRecord](https://github.com/jeremyevans/sequel) driver for [River](https://github.com/riverqueue/river)'s [`riverqueue` gem for Ruby](https://rubygems.org/gems/riverqueue).
+[ActiveRecord](https://guides.rubyonrails.org/active_record_basics.html) driver for [River](https://github.com/riverqueue/river)'s [`riverqueue` gem for Ruby](https://rubygems.org/gems/riverqueue). PostgreSQL and SQLite are supported.
 
-`Gemfile` should contain the core gem and a driver like this one:
+Add the core gem and this driver to `Gemfile`:
 
-``` yaml
+```ruby
 gem "riverqueue"
-gem "riverqueue-sequel"
+gem "riverqueue-activerecord"
+```
+
+Database adapters are optional dependencies. Add only the adapter used by your
+application.
+
+For PostgreSQL, add `pg` to `Gemfile`:
+
+```ruby
+gem "pg"
+```
+
+Then initialize a client with ActiveRecord's established connection:
+
+```ruby
+ActiveRecord::Base.establish_connection("postgres://localhost/my_app")
+client = River::Client.new(River::Driver::ActiveRecord.new)
+```
+
+For SQLite, add `sqlite3` to `Gemfile`:
+
+```ruby
+gem "sqlite3"
 ```
 
-Initialize a client with:
+Then initialize a client with an SQLite connection:
 
 ```ruby
-DB = ActiveRecord.connect("postgres://...")
-client = River::Client.new(River::Driver::ActiveRecord.new(DB))
+ActiveRecord::Base.establish_connection(
+  adapter: "sqlite3",
+  database: "storage/river.sqlite3",
+  timeout: 5_000
+)
+client = River::Client.new(River::Driver::ActiveRecord.new)
 ```
 
-See also [`rubyqueue`](https://github.com/riverqueue/riverqueue-ruby).
+Use current River migrations to create and update the SQLite database.
 
 ## Development