WIP

.github/workflows/main.yml

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+name: Test
+on: [push, pull_request]
+
+jobs:
+  # Run the linter first for rapid feedback if some trivial stylistic issues
+  # slipped through the cracks.
+  lint:
+    runs-on: ubuntu-latest
+    env:
+      # When running in CI the gemspec does NOT pull rubocop as a dependency
+      # to avoid conflicting with various Ruby/Rails setups. We need to
+      # set LINT to explicitly request rubocop as a dependency.
+      LINT: true
+    steps:
+      - uses: actions/checkout@v3
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 3.2
+          bundler-cache: true
+      - run: bundle exec rake rubocop
+
+  test-latest-against-postgresql:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        # We can't test against previous versions of Ruby without extra
+        # effort to make mysql2 work. See the link above for more information
+        # about the issue we run into:
+        #
+        #   https://github.com/ruby/setup-ruby/issues/150
+        include:
+          - ruby: 2.6
+            rubygems: 3.2.3
+            active_record: 4.2
+            bundler: 1.17.3
+          - ruby: 2.7
+            active_record: 5.0
+          - ruby: 2.7
+            active_record: 5.1
+          - ruby: 2.7
+            active_record: 5.2
+          - ruby: 3.2
+            active_record: 6.1
+          - ruby: 3.2
+            active_record: 6.1
+          - ruby: 3.2
+            active_record: 7.0
+    steps:
+      - uses: ./.github/workflows/postgresql
+        with:
+          ruby: ${{ matrix.ruby }}
+          active_record: ${{ matrix.active_record }}
+          rubygems: ${{ matrix.rubygems }}
+          bundler: ${{ matrix.bundler }}
+
+  test-latest-against-mysql:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        # We can't test against previous versions of Ruby without extra
+        # effort to make mysql2 work. See the link above for more information
+        # about the issue we run into:
+        #
+        #   https://github.com/ruby/setup-ruby/issues/150
+        include:
+          - ruby: 2.6
+            rubygems: 3.2.3
+            active_record: 4.2
+            bundler: 1.17.3
+          - ruby: 2.7
+            active_record: 5.0
+          - ruby: 2.7
+            active_record: 5.1
+          - ruby: 2.7
+            active_record: 5.2
+          - ruby: 3.2
+            active_record: 6.1
+          - ruby: 3.2
+            active_record: 6.1
+          - ruby: 3.2
+            active_record: 7.0
+    steps:
+      - uses: ./.github/workflows/mysql
+        with:
+          ruby: ${{ matrix.ruby }}
+          active_record: ${{ matrix.active_record }}
+          rubygems: ${{ matrix.rubygems }}
+          bundler: ${{ matrix.bundler }}
+
+  test-remaining-against-postgresql:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        # We can't test against previous versions of Ruby without extra
+        # effort to make mysql2 work. See the link above for more information
+        # about the issue we run into:
+        #
+        #   https://github.com/ruby/setup-ruby/issues/150
+        include:
+          - ruby: 2.4
+            rubygems: 3.2.3
+            active_record: 4.2
+            bundler: 1.17.3
+          - ruby: 2.5
+            rubygems: 3.2.3
+            active_record: 4.2
+            bundler: 1.17.3
+
+          - ruby: 2.4
+            rubygems: 3.2.3
+            active_record: 5.0
+          - ruby: 2.5
+            rubygems: 3.2.3
+            active_record: 5.0
+          - ruby: 2.6
+            rubygems: 3.2.3
+            active_record: 5.0
+
+          - ruby: 2.4
+            rubygems: 3.2.3
+            active_record: 5.1
+          - ruby: 2.5
+            rubygems: 3.2.3
+            active_record: 5.1
+          - ruby: 2.6
+            rubygems: 3.2.3
+            active_record: 5.1
+
+          - ruby: 2.4
+            rubygems: 3.2.3
+            active_record: 5.2
+          - ruby: 2.5
+            rubygems: 3.2.3
+            active_record: 5.2
+          - ruby: 2.6
+            rubygems: 3.2.3
+            active_record: 5.2
+
+          - ruby: 2.5
+            rubygems: 3.2.3
+            active_record: 6.0
+          - ruby: 2.6
+            rubygems: 3.2.3
+            active_record: 6.0
+          - ruby: 2.7
+            active_record: 6.0
+          - ruby: 3.0
+            active_record: 6.0
+          - ruby: 3.1
+            active_record: 6.1
+
+          - ruby: 2.5
+            rubygems: 3.2.3
+            active_record: 6.1
+          - ruby: 2.6
+            rubygems: 3.2.3
+            active_record: 6.1
+          - ruby: 2.7
+            active_record: 6.1
+          - ruby: 3.0
+            active_record: 6.1
+          - ruby: 3.1
+            active_record: 6.1
+
+          - ruby: 2.7
+            active_record: 7.0
+          - ruby: 3.0
+            active_record: 7.0
+          - ruby: 3.1
+            active_record: 7.0
+    steps:
+      - uses: ./.github/workflows/postgresql
+        with:
+          ruby: ${{ matrix.ruby }}
+          active_record: ${{ matrix.active_record }}
+          rubygems: ${{ matrix.rubygems }}
+          bundler: ${{ matrix.bundler }}
+
+  test-remaining-against-mysql:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        # We can't test against previous versions of Ruby without extra
+        # effort to make mysql2 work. See the link above for more information
+        # about the issue we run into:
+        #
+        #   https://github.com/ruby/setup-ruby/issues/150
+        include:
+          - ruby: 2.4
+            rubygems: 3.2.3
+            active_record: 4.2
+            bundler: 1.17.3
+          - ruby: 2.5
+            rubygems: 3.2.3
+            active_record: 4.2
+            bundler: 1.17.3
+
+          - ruby: 2.4
+            rubygems: 3.2.3
+            active_record: 5.0
+          - ruby: 2.5
+            rubygems: 3.2.3
+            active_record: 5.0
+          - ruby: 2.6
+            rubygems: 3.2.3
+            active_record: 5.0
+
+          - ruby: 2.4
+            rubygems: 3.2.3
+            active_record: 5.1
+          - ruby: 2.5
+            rubygems: 3.2.3
+            active_record: 5.1
+          - ruby: 2.6
+            rubygems: 3.2.3
+            active_record: 5.1
+
+          - ruby: 2.4
+            rubygems: 3.2.3
+            active_record: 5.2
+          - ruby: 2.5
+            rubygems: 3.2.3
+            active_record: 5.2
+          - ruby: 2.6
+            rubygems: 3.2.3
+            active_record: 5.2
+
+          - ruby: 2.5
+            rubygems: 3.2.3
+            active_record: 6.0
+          - ruby: 2.6
+            rubygems: 3.2.3
+            active_record: 6.0
+          - ruby: 2.7
+            active_record: 6.0
+          - ruby: 3.0
+            active_record: 6.0
+          - ruby: 3.1
+            active_record: 6.1
+
+          - ruby: 2.5
+            rubygems: 3.2.3
+            active_record: 6.1
+          - ruby: 2.6
+            rubygems: 3.2.3
+            active_record: 6.1
+          - ruby: 2.7
+            active_record: 6.1
+          - ruby: 3.0
+            active_record: 6.1
+          - ruby: 3.1
+            active_record: 6.1
+
+          - ruby: 2.7
+            active_record: 7.0
+          - ruby: 3.0
+            active_record: 7.0
+          - ruby: 3.1
+            active_record: 7.0
+    steps:
+      - uses: ./.github/workflows/mysql
+        with:
+          ruby: ${{ matrix.ruby }}
+          active_record: ${{ matrix.active_record }}
+          rubygems: ${{ matrix.rubygems }}
+          bundler: ${{ matrix.bundler }}

.github/workflows/mysql/action.yml

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+name: Test specified versions of Ruby and Active Record against MySQL
+
+on:
+  workflow_call:
+    inputs:
+      ruby:
+        required: true
+        type: string
+      active_record:
+        required: true
+        type: string
+      rubygems:
+        required: false
+        type: string
+      bundler:
+        required: false
+        type: string
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    services:
+      mysql:
+        image: mysql
+        env:
+          MYSQL_ROOT_PASSWORD: github
+          MYSQL_USER: github
+          MYSQL_PASSWORD: github
+          MYSQL_DATABASE: active_record_doctor_primary
+        options: >-
+          --health-cmd "mysqladmin ping -h 127.0.0.1"
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+        ports:
+          - 3306:3306
+    env:
+      BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/Gemfile.activerecord-${{ inputs.active_record }}.x
+    steps:
+      - uses: actions/checkout@v3
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ inputs.ruby }}
+          rubygems: ${{ inputs.rubygems }}
+          bundler: ${{ inputs.bundler }}
+          bundler-cache: true
+      - name: Prepare MySQL
+        run: |
+          mysqladmin -h127.0.0.1 -uroot -pgithub create active_record_doctor_secondary
+          mysql -h127.0.0.1 -uroot -pgithub -e "GRANT ALL PRIVILEGES ON active_record_doctor_secondary.* TO 'github'"
+      - name: Run the test suite against MySQL
+        run: bundle exec rake test:mysql2
+        env:
+          # We can't use localhost because that makes the MySQL client try
+          # connecting via a Unix socket instead of TCP.
+          DATABASE_HOST: 127.0.0.1
+          DATABASE_PORT: 3306
+          DATABASE_USERNAME: github
+          DATABASE_PASSWORD: github

.github/workflows/postgresql/action.yml

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+name: Test specified versions of Ruby and Active Record against MySQL
+
+on:
+  workflow_call:
+    inputs:
+      ruby:
+        required: true
+        type: string
+      active_record:
+        required: true
+        type: string
+      rubygems:
+        required: false
+        type: string
+      bundler:
+        required: false
+        type: string
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    services:
+      postgres:
+        image: postgres
+        env:
+          POSTGRES_DB: active_record_doctor_primary
+          POSTGRES_USER: github
+          POSTGRES_PASSWORD: github
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+        ports:
+          - 5432:5432
+    env:
+      BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/Gemfile.activerecord-${{ inputs.active_record }}.x
+    steps:
+      - uses: actions/checkout@v3
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ inputs.ruby }}
+          rubygems: ${{ inputs.rubygems }}
+          bundler: ${{ inputs.bundler }}
+          bundler-cache: true
+      - name: Prepare PostgreSQL
+        run: createdb active_record_doctor_secondary
+        env:
+          PGHOST: localhost
+          PGPORT: 5432
+          PGUSER: github
+          PGPASSWORD: github
+          PGDATABASE: postgres
+      - name: Run the test suite against PostgreSQL
+        run: bundle exec rake test:postgresql
+        env:
+          DATABASE_HOST: localhost
+          DATABASE_PORT: 5432
+          DATABASE_USERNAME: github
+          DATABASE_PASSWORD: github