SQLite3 as the database

.gitignore

@@ -17,3 +17,6 @@ tmp
 _yardoc
 doc/
 .DS_Store
+
+# SQLite database
+/storage/*

Gemfile

@@ -3,7 +3,7 @@
 source 'https://rubygems.org/'
 ruby file: '.ruby-version'
 
-gem 'sequel'
+gem 'sequel', github: 'jeremyevans/sequel'
 gem 'pg'
 gem 'sequel_pg', require: 'sequel'
 gem 'sinatra'
@@ -26,6 +26,7 @@ gem 'rake'
 gem 'rubocop', '~> 1.64.1', require: false
 gem 'dyno_metadata'
 gem 'localhost'
+gem 'sqlite3'
 
 group :test do
   gem 'climate_control'

Gemfile.lock

@@ -1,3 +1,10 @@
+GIT
+  remote: https://github.com/jeremyevans/sequel.git
+  revision: 7b748b5c89b1448fb6e1c42037b741421fa32101
+  specs:
+    sequel (5.81.0)
+      bigdecimal
+
 GEM
   remote: https://rubygems.org/
   specs:
@@ -43,6 +50,7 @@ GEM
     mime-types (3.3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2020.1104)
+    mini_portile2 (2.8.7)
     minitest (5.23.1)
     multi_json (1.15.0)
     mustermann (3.0.0)
@@ -112,8 +120,6 @@ GEM
     selma (0.2.2-x86_64-linux)
     sentry-ruby (5.16.1)
       concurrent-ruby (~> 1.0, >= 1.0.2)
-    sequel (5.81.0)
-      bigdecimal
     sequel_pg (1.17.1)
       pg (>= 0.18.0, != 1.2.0)
       sequel (>= 4.38.0)
@@ -130,6 +136,11 @@ GEM
       sinatra (= 4.0.0)
       tilt (~> 2.0)
     spinels-rack-ssl-enforcer (0.3.0)
+    sqlite3 (2.0.2)
+      mini_portile2 (~> 2.8.0)
+    sqlite3 (2.0.2-aarch64-linux-gnu)
+    sqlite3 (2.0.2-arm64-darwin)
+    sqlite3 (2.0.2-x86_64-linux-gnu)
     strscan (3.1.0)
     temple (0.10.3)
     thor (1.3.0)
@@ -175,11 +186,12 @@ DEPENDENCIES
   rest-client
   rubocop (~> 1.64.1)
   sentry-ruby
-  sequel
+  sequel!
   sequel_pg
   sinatra
   sinatra-contrib
   spinels-rack-ssl-enforcer
+  sqlite3
   wait_for_it
   warning
   webmock

Rakefile

@@ -24,14 +24,16 @@ namespace(:db) do
   desc "Run migrations"
   task :migrate, [:version] do |t, args|
     require 'sequel'
+    require_relative 'config/database' # creates DB
+
     Sequel.extension(:migration)
-    db = Sequel.connect(ENV.fetch('DATABASE_URL', 'postgres://localhost/wikimum'))
+
     if args[:version]
       puts "Migrating to version #{args[:version]}"
-      Sequel::Migrator.run(db, 'migrations', target: args[:version].to_i)
+      Sequel::Migrator.run(DB, 'migrations', target: args[:version].to_i)
     else
       puts "Migrating to latest"
-      Sequel::Migrator.run(db, 'migrations')
+      Sequel::Migrator.run(DB, 'migrations')
     end
   end
 end

config/app.rb

@@ -4,13 +4,7 @@
 require 'sequel'
 
 require_relative '../lib/app'
-
-DB = Sequel.connect(ENV.fetch('DATABASE_URL', 'postgres://localhost/wikimum'))
-
-# https://github.com/Starkast/wikimum/issues/412
-# https://sequel.jeremyevans.net/rdoc-plugins/files/lib/sequel/extensions/connection_validator_rb.html
-DB.extension(:connection_validator)
-DB.pool.connection_validation_timeout = 60 * 5
+require_relative 'database'
 
 if App.development?
   require 'logger'

config/database.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+database_url = ENV.fetch("DATABASE_URL", "sqlite://storage/wiki.db")
+DB = Sequel.connect(database_url)
+
+# https://github.com/Starkast/wikimum/issues/412
+# https://sequel.jeremyevans.net/rdoc-plugins/files/lib/sequel/extensions/connection_validator_rb.html
+DB.extension(:connection_validator)
+DB.pool.connection_validation_timeout = 60 * 5

migrations/11_page_search.rb

@@ -1,9 +1,21 @@
 # frozen_string_literal: true
 
 Sequel.migration do
-  change do
+  up do
+    # SQLite is not using indexes for full text search
+    # https://sqlite.org/fts5.html
+    next if database_type == :sqlite
+
     alter_table(:pages) do
       add_full_text_index %i(title content description)
     end
   end
+
+  down do
+    next if database_type == :sqlite
+
+    alter_table(:pages) do
+      drop_index %i(title content description)
+    end
+  end
 end