Enable test runs on CI and small edits to README

.github/workflows/test.yml

@@ -0,0 +1,36 @@
+on: [push]
+env:
+  # Sets the superuser username and password for PostgreSQL.
+  POSTGRES_USER: github
+  POSTGRES_PASSWORD: oiz5FeebOosh6aet
+jobs:
+  build:
+    strategy:
+      matrix:
+        ruby_version: ["3.4", "3.3"]
+    runs-on: ubuntu-latest
+    services:
+      postgres:
+        image: postgres:17
+        env:
+          # Default database that is created when the image is first started.
+          POSTGRES_DB: active_record_collation_test
+          # This is so dumb…
+          POSTGRES_USER: ${{ env.POSTGRES_USER }}
+          POSTGRES_PASSWORD: ${{ env.POSTGRES_PASSWORD }}
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+        ports:
+          - 5432:5432
+    steps:
+      - uses: actions/checkout@v5
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby_version }}
+          bundler-cache: true
+      - run: bundle exec rubocop
+      - run: cd test/dummy && rm -f db/schema.rb && RAILS_ENV=test bundle exec rake db:drop db:create db:migrate
+      - run: bundle exec rake test

.rubocop.yml

@@ -4,6 +4,7 @@ AllCops:
   TargetRubyVersion: 3.3
   Exclude:
     - test/dummy/db/schema.rb
+    - vendor/**/*
 Layout/LineLength:
   Max: 100
 Metrics/BlockLength:

README.md

@@ -18,17 +18,17 @@ See [Postgres collation documentation](https://www.postgresql.org/docs/current/c
 
 ## Setup
 
-Add `activerecord-collations` to your dependencies. If you also want the `collate` class method on your model you also include the collation module:
+Add `activerecord-collations` to your dependencies. Include the collation concern into your models to get access to the `collate` class method.
 
 ```ruby
 class ApplicationRecord < ActiveRecord::Base
-  self.abstract_class = true
+  primary_abstract_class
 
   include ActiveRecord::Collation
 end
 ```
 
-The collate method creates an ARel expression for the column with a certain collation.
+The `collate` method creates an ARel expression for the column with a certain collation.
 
 ```ruby
 scope :ordered, -> { order(collate(:title, "natural_#{I18n.locale}") }
@@ -45,11 +45,11 @@ Arel::Nodes::InfixOperation.new(
 )
 ```
 
-## Testing
+## Development
 
-The Dummy application uses the gem so you can load the schema and run migrations there:
+Run tests in this repository with `rake`. Migrations are exercised by running them in the dummy application.
 
 ```
 cd test/dummy
-RAILS_ENV=test rake db:migrate
+rm -f db/schema.rb && RAILS_ENV=test rake db:drop db:create db:migrate
 ```

test/dummy/config/database.yml

@@ -4,3 +4,5 @@ test:
   host: localhost
   pool: 16
   database: active_record_collation_test
+  user: <%= ENV.fetch("POSTGRES_USER", nil) %>
+  password: <%= ENV.fetch("POSTGRES_PASSWORD", nil) %>