Drop mysql2 support, settle on postgresql

It's enough work to support one database, let's settle on
the defacto Rails default.

.dockerignore

@@ -1,7 +1,6 @@
 .bundle/cache
 .git/
 coverage/
-db/*.sqlite3
 Dockerfile
 docker-compose.*
 log/

.github/workflows/next-rails.yml

@@ -12,6 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     name: next-rails
     env:
+      OSEM_DB_HOST: localhost
       RAILS_ENV: test
     strategy:
       matrix:
@@ -29,7 +30,6 @@ jobs:
           bundler-cache: true
       - name: Prepare spec
         run: |
-          rm -f osem_test osem_development
           bundle exec rake db:setup --trace
           bundle exec bin/rails webdrivers:chromedriver:update
       - name: spec/${{ matrix.suite }}
@@ -40,3 +40,15 @@ jobs:
         with:
           project-token: ${{ secrets.CODACY_PROJECT_TOKEN }}
           coverage-reports: coverage/coverage.xml
+    services:
+      postgres:
+        image: postgres:16-alpine
+        env:
+          POSTGRES_PASSWORD: mysecretpassword
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+        ports:
+          - 5432:5432

.github/workflows/spec.yml

@@ -25,6 +25,7 @@ jobs:
     runs-on: ubuntu-latest
     name: spec
     env:
+      OSEM_DB_HOST: localhost
       RAILS_ENV: test
     strategy:
       matrix:
@@ -37,7 +38,6 @@ jobs:
           bundler-cache: true
       - name: Prepare spec
         run: |
-          rm -f osem_test osem_development
           bundle exec rake db:setup --trace
           bundle exec bin/rails webdrivers:chromedriver:update
           bundle exec rake factory_bot:lint RAILS_ENV=test
@@ -49,3 +49,15 @@ jobs:
         with:
           project-token: ${{ secrets.CODACY_PROJECT_TOKEN }}
           coverage-reports: coverage/coverage.xml
+    services:
+      postgres:
+        image: postgres:16-alpine
+        env:
+          POSTGRES_PASSWORD: mysecretpassword
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+        ports:
+          - 5432:5432

.gitignore

@@ -1,4 +1,3 @@
-/db/test.sqlite3-journal
 config/application.rb
 config/config.yml
 config/secrets.yml
@@ -18,7 +17,6 @@ capybara-*.html
 /vendor/bundle
 /log/*
 /tmp/*
-/db/*.sqlite3
 /public/system/*
 /coverage/
 /spec/tmp/*

.rubocop_todo.yml

@@ -1,6 +1,6 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config`
-# on 2024-06-06 14:55:31 UTC using RuboCop version 1.63.5.
+# on 2024-06-06 15:22:39 UTC using RuboCop version 1.63.5.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
@@ -1156,6 +1156,13 @@ Rails/Blank:
     - 'app/models/user.rb'
     - 'spec/factories/event_schedule.rb'
 
+# Offense count: 68
+# Configuration parameters: Database, Include.
+# SupportedDatabases: mysql, postgresql
+# Include: db/**/*.rb
+Rails/BulkChangeTable:
+  Enabled: false
+
 # Offense count: 1
 # This cop supports unsafe autocorrection (--autocorrect-all).
 Rails/CompactBlank:

Gemfile

@@ -22,8 +22,7 @@ gem 'puma'
 # http://edgeguides.rubyonrails.org/upgrading_ruby_on_rails.html#responders
 gem 'responders', '~> 3.0'
 
-# as supported databases
-gem 'mysql2'
+# as database
 gem 'pg'
 
 # for tracking data changes

Gemfile.lock

@@ -307,7 +307,6 @@ GEM
     multi_xml (0.7.1)
       bigdecimal (~> 3.1)
     multipart-post (2.4.1)
-    mysql2 (0.5.6)
     net-http (0.4.1)
       uri
     net-imap (0.4.11)
@@ -663,7 +662,6 @@ DEPENDENCIES
   mina
   mini_magick
   money-rails
-  mysql2
   next_rails
   omniauth
   omniauth-facebook

config/database.yml

@@ -1,14 +1,6 @@
-<%
-  encoding = 'unicode'
-  if ENV.fetch('OSEM_DB_ADAPTER', nil) == 'mysql2'
-    encoding = 'utf8'
-  end
-%>
-
-
 default: &default
-  adapter: <%= ENV.fetch('OSEM_DB_ADAPTER', 'postgresql') %>
-  encoding: <%= encoding %>
+  adapter: 'postgresql'
+  encoding: 'unicode'
   host: <%= ENV.fetch('OSEM_DB_HOST', 'database') %>
   port: <%= ENV.fetch('OSEM_DB_PORT', '5432')  %>
   username: <%= ENV.fetch('OSEM_DB_USER', 'postgres') %>
@@ -21,9 +13,6 @@ development:
   <<: *default
   database: osem_development
 
-# Warning: The database defined as "test" will be erased and
-# re-generated when you run "rake".
-# Do not set this db to the same as development or production.
 test:
   <<: *default
   database: osem_test

docker-compose.yml

@@ -2,7 +2,7 @@ version: "2.4"
 
 services:
   database:
-    image: postgres:12-alpine
+    image: postgres:16-alpine
     environment:
       PGDATA: /var/lib/postgresql/data/pgdata
       POSTGRES_PASSWORD: mysecretpassword

dotenv.example

@@ -9,9 +9,6 @@
 # bundle exec rake secret
 # SECRET_KEY_BASE=12345
 
-# The type of database to use (postgresql, mysql2, sqlite3)
-# OSEM_DB_ADAPTER=mysql2
-
 # The name of the host the database runs on
 # OSEM_DB_HOST=database