add skeleton for models

.ruby-version

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+3.1

Gemfile

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+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
+
+gem "sequel"
+gem "sqlite3"
+
+group :development do
+  gem "minitest"
+  gem "rake"
+  gem "steep"
+  gem "typeprof"
+end

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    activesupport (7.0.4)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      tzinfo (~> 2.0)
+    ast (2.4.2)
+    concurrent-ruby (1.1.10)
+    csv (3.2.5)
+    ffi (1.15.5)
+    fileutils (1.6.0)
+    i18n (1.12.0)
+      concurrent-ruby (~> 1.0)
+    json (2.6.2)
+    language_server-protocol (3.17.0.1)
+    listen (3.7.1)
+      rb-fsevent (~> 0.10, >= 0.10.3)
+      rb-inotify (~> 0.9, >= 0.9.10)
+    logger (1.5.1)
+    minitest (5.16.3)
+    parallel (1.22.1)
+    parser (3.1.2.1)
+      ast (~> 2.4.1)
+    rainbow (3.1.1)
+    rake (13.0.6)
+    rb-fsevent (0.11.2)
+    rb-inotify (0.10.1)
+      ffi (~> 1.0)
+    rbs (2.7.0)
+    securerandom (0.2.0)
+    sequel (5.62.0)
+    sqlite3 (1.5.3-arm64-darwin)
+    steep (1.2.1)
+      activesupport (>= 5.1)
+      csv (>= 3.0.9)
+      fileutils (>= 1.1.0)
+      json (>= 2.1.0)
+      language_server-protocol (>= 3.15, < 4.0)
+      listen (~> 3.0)
+      logger (>= 1.3.0)
+      parallel (>= 1.0.0)
+      parser (>= 3.1)
+      rainbow (>= 2.2.2, < 4.0)
+      rbs (>= 2.7.0)
+      securerandom (>= 0.1)
+      strscan (>= 1.0.0)
+      terminal-table (>= 2, < 4)
+    strscan (3.0.4)
+    terminal-table (3.0.2)
+      unicode-display_width (>= 1.1.1, < 3)
+    typeprof (0.21.3)
+      rbs (>= 1.8.1)
+    tzinfo (2.0.5)
+      concurrent-ruby (~> 1.0)
+    unicode-display_width (2.3.0)
+
+PLATFORMS
+  arm64-darwin-21
+
+DEPENDENCIES
+  minitest
+  rake
+  sequel
+  sqlite3
+  steep
+  typeprof
+
+BUNDLED WITH
+   2.3.18

Rakefile

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+require "minitest/test_task"
+require "sequel"
+
+task default: :test
+
+namespace :db do
+  desc "Run migrations"
+  task :migrate, [:version] do |t, args|
+    require "sequel/core"
+    Sequel.extension :migration
+    version = args[:version].to_i if args[:version]
+    Sequel.connect(ENV.fetch("DATABASE_URL")) do |db|
+      Sequel::Migrator.run(db, "db/migrations", target: version)
+    end
+  end
+end
+
+Minitest::TestTask.create(:test) do |t|
+  t.test_globs = ["test/**/test_*.rb"]
+end
+
+namespace :test do
+  desc "Run tests on Ruby file changes"
+  task :watch do
+    sh "fd .*.rb | entr -d rake test"
+  end
+end

Steepfile

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+# D = Steep::Diagnostic
+#
+# target :lib do
+#   signature "sig"
+#
+#   check "lib"                       # Directory name
+#   check "Gemfile"                   # File name
+#   check "app/models/**/*.rb"        # Glob
+#   # ignore "lib/templates/*.rb"
+#
+#   # library "pathname", "set"       # Standard libraries
+#   # library "strong_json"           # Gems
+#
+#   # configure_code_diagnostics(D::Ruby.strict)       # `strict` diagnostics setting
+#   # configure_code_diagnostics(D::Ruby.lenient)      # `lenient` diagnostics setting
+#   # configure_code_diagnostics do |hash|             # You can setup everything yourself
+#   #   hash[D::Ruby::NoMethod] = :information
+#   # end
+# end
+
+# target :test do
+#   signature "sig", "sig-private"
+#
+#   check "test"
+#
+#   # library "pathname", "set"       # Standard libraries
+# end

db/migrations/001_init.rb

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+Sequel.migration do
+  change do
+    create_table(:pools) do
+      primary_key :id
+
+      String :name, null: false
+
+      DateTime :created_at, null: false
+      DateTime :updated_at, null: false
+    end
+
+    create_table(:items) do
+      primary_key :id
+
+      foreign_key :pool_id, :pools
+
+      String :title, null: false
+      String :body, null: false
+
+      DateTime :created_at, null: false
+      DateTime :updated_at, null: false
+    end
+
+    create_table(:axes) do
+      primary_key :id
+
+      foreign_key :pool_id, :pools
+
+      String :name, null: false
+      String :better_legend, null: false
+      String :worse_legend, null: false
+
+      DateTime :created_at, null: false
+      DateTime :updated_at, null: false
+    end
+
+    create_table(:ratings) do
+      primary_key :id
+
+      foreign_key :axis_id, :axes
+      foreign_key :winner_id, :items
+      foreign_key :loser_id, :items
+
+      DateTime :created_at, null: false
+      DateTime :updated_at, null: false
+    end
+
+    create_table(:rankings) do
+      primary_key :id
+
+      foreign_key :axis_id, :axes
+      foreign_key :item_id, :items
+
+      Float :mu, null: false
+      Float :sigma, null: false
+
+      DateTime :created_at, null: false
+      DateTime :updated_at, null: false
+    end
+  end
+end

lib/rank_king.rb

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+require "sequel"
+
+Sequel::Model.plugin :timestamps, update_on_create: true
+
+module RankKing
+  DB = Sequel.connect(ENV.fetch("DATABASE_URL"))
+
+  class Pool < Sequel::Model
+  end
+
+  class Item < Sequel::Model
+  end
+
+  class Axis < Sequel::Model(:axes)
+  end
+
+  def self.rate(axis:, winner:, loser:)
+  end
+end

test/test_rank_king.rb

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+require "minitest/autorun"
+
+require "rank_king"
+
+module RankKing
+  class TestRankKing < Minitest::Test
+    def test_rank_king
+      pool = Pool.create(name: "Ping Pong")
+
+      alice = Item.create(title: "Alice", body: "")
+      bob = Item.create(title: "Bob", body: "")
+      eve = Item.create(title: "Eve", body: "")
+      mallory = Item.create(title: "Mallory", body: "")
+
+      axis = Axis.create(name: "Rank", better_legend: "Better", worse_legend: "Worse")
+
+      RankKing.rate(axis:, winner: alice, loser: bob)
+    end
+  end
+end