リポジトリ

Gemfile

@@ -4,6 +4,7 @@ source "https://rubygems.org"
 
 git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
 
+gem 'activerecord'
 gem 'debase'
 gem 'guard'
 gem 'guard-minitest'
@@ -13,7 +14,9 @@ gem 'launchy'
 gem 'minitest'
 gem 'minitest-reporters'
 gem 'rake'
+gem 'rom'
+gem 'rom-sql'
 gem 'rubocop', require: false
 gem 'ruby-debug-ide'
-gem 'simplecov', require: false, group: :tes
+gem 'simplecov', require: false, group: :test
 gem 'sqlite3'

Gemfile.lock

@@ -1,16 +1,56 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    activemodel (6.0.2)
+      activesupport (= 6.0.2)
+    activerecord (6.0.2)
+      activemodel (= 6.0.2)
+      activesupport (= 6.0.2)
+    activesupport (6.0.2)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
+      minitest (~> 5.1)
+      tzinfo (~> 1.1)
+      zeitwerk (~> 2.2)
     addressable (2.7.0)
       public_suffix (>= 2.0.2, < 5.0)
     ansi (1.5.0)
     ast (2.4.0)
     builder (3.2.4)
     coderay (1.1.2)
+    concurrent-ruby (1.1.6)
     debase (0.2.4.1)
       debase-ruby_core_source (>= 0.10.2)
     debase-ruby_core_source (0.10.9)
     docile (1.3.2)
+    dry-configurable (0.11.5)
+      concurrent-ruby (~> 1.0)
+      dry-core (~> 0.4, >= 0.4.7)
+      dry-equalizer (~> 0.2)
+    dry-container (0.7.2)
+      concurrent-ruby (~> 1.0)
+      dry-configurable (~> 0.1, >= 0.1.3)
+    dry-core (0.4.9)
+      concurrent-ruby (~> 1.0)
+    dry-equalizer (0.3.0)
+    dry-inflector (0.2.0)
+    dry-initializer (3.0.3)
+    dry-logic (1.0.6)
+      concurrent-ruby (~> 1.0)
+      dry-core (~> 0.2)
+      dry-equalizer (~> 0.2)
+    dry-struct (1.3.0)
+      dry-core (~> 0.4, >= 0.4.4)
+      dry-equalizer (~> 0.3)
+      dry-types (~> 1.3)
+      ice_nine (~> 0.11)
+    dry-types (1.4.0)
+      concurrent-ruby (~> 1.0)
+      dry-container (~> 0.3)
+      dry-core (~> 0.4, >= 0.4.4)
+      dry-equalizer (~> 0.3)
+      dry-inflector (~> 0.1, >= 0.1.2)
+      dry-logic (~> 1.0, >= 1.0.2)
     ffi (1.12.2)
     ffi (1.12.2-x64-mingw32)
     formatador (0.2.5)
@@ -33,6 +73,9 @@ GEM
     guard-shell (0.7.1)
       guard (>= 2.0.0)
       guard-compat (~> 1.0)
+    i18n (1.8.2)
+      concurrent-ruby (~> 1.0)
+    ice_nine (0.11.2)
     jaro_winkler (1.5.4)
     launchy (2.4.3)
       addressable (~> 2.3)
@@ -63,6 +106,34 @@ GEM
     rb-fsevent (0.10.3)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
+    rom (5.2.4)
+      rom-changeset (~> 5.2, >= 5.2.3)
+      rom-core (~> 5.2, >= 5.2.3)
+      rom-repository (~> 5.2, >= 5.2.2)
+    rom-changeset (5.2.3)
+      dry-core (~> 0.4)
+      rom-core (~> 5.2)
+      transproc (~> 1.0, >= 1.1.0)
+    rom-core (5.2.3)
+      concurrent-ruby (~> 1.1)
+      dry-container (~> 0.7)
+      dry-core (~> 0.4)
+      dry-equalizer (~> 0.2)
+      dry-inflector (~> 0.1)
+      dry-initializer (~> 3.0, >= 3.0.1)
+      dry-struct (~> 1.0)
+      dry-types (~> 1.0)
+      transproc (~> 1.0, >= 1.1.0)
+    rom-repository (5.2.2)
+      dry-core (~> 0.4)
+      dry-initializer (~> 3.0, >= 3.0.1)
+      rom-core (~> 5.2, >= 5.2.2)
+    rom-sql (3.2.0)
+      dry-core (~> 0.4)
+      dry-equalizer (~> 0.2)
+      dry-types (~> 1.0)
+      rom-core (~> 5.2, >= 5.2.1)
+      sequel (>= 4.49)
     rubocop (0.79.0)
       jaro_winkler (~> 1.5.1)
       parallel (~> 1.10)
@@ -73,20 +144,27 @@ GEM
     ruby-debug-ide (0.7.0)
       rake (>= 0.8.1)
     ruby-progressbar (1.10.1)
+    sequel (5.33.0)
     shellany (0.0.1)
     simplecov (0.18.2)
       docile (~> 1.1)
       simplecov-html (~> 0.11)
     simplecov-html (0.12.0)
     sqlite3 (1.4.2)
     thor (1.0.1)
+    thread_safe (0.3.6)
+    transproc (1.1.1)
+    tzinfo (1.2.6)
+      thread_safe (~> 0.1)
     unicode-display_width (1.6.1)
+    zeitwerk (2.3.0)
 
 PLATFORMS
   ruby
   x64-mingw32
 
 DEPENDENCIES
+  activerecord
   debase
   guard
   guard-minitest
@@ -96,6 +174,8 @@ DEPENDENCIES
   minitest
   minitest-reporters
   rake
+  rom
+  rom-sql
   rubocop
   ruby-debug-ide
   simplecov

Rakefile

@@ -1,7 +1,9 @@
 # frozen_string_literal: true
 
+require 'active_record'
 require 'rake/testtask'
 require 'rubocop/rake_task'
+require './lib/db.rb'
 RuboCop::RakeTask.new
 
 task default: [:guard]
@@ -29,4 +31,18 @@ end
 desc 'Show Coverate Report'
 task :coverage_report do
   sh 'launchy ./coverage/index.html'
+end
+
+namespace :db do
+  DB.connect
+
+  desc 'CreateDatabase'
+  task :create do
+    DB.create
+  end
+
+  desc 'DropDatabase'
+  task :drop do
+    DB.destroy
+  end
 end

lib/db.rb

@@ -0,0 +1,43 @@
+# frozen_string_literal: true
+
+class InitialSchema < ActiveRecord::Migration[4.2]
+  def self.up
+    create_table :users do |t|
+      t.string :name
+    end
+  end
+
+  def self.down
+    drop_table :users
+  end
+end
+
+class DB
+  class << self
+    def connect
+      ActiveRecord::Base.establish_connection(
+        adapter: 'sqlite3',
+        database: 'sns.db'
+      )
+    end
+
+    def create
+      InitialSchema.migrate(:up)
+    end
+
+    def destroy
+      InitialSchema.migrate(:down)
+    end
+  end
+end
+
+class TestDB < DB
+  class << self
+    def connect
+      ActiveRecord::Base.establish_connection(
+        adapter: 'sqlite3',
+        database: ':memory:'
+      )
+    end
+  end
+end

lib/sns.rb

@@ -1,8 +1,13 @@
 # frozen_string_literal: true
 
+require 'active_record'
+require 'sqlite3'
+require 'securerandom'
+require './lib/db.rb'
 require './lib/user_id.rb'
 require './lib/user_name.rb'
 require './lib/user.rb'
 require './lib/user_service.rb'
-require 'sqlite3'
-require 'securerandom'
+require './lib/user_repository.rb'
+
+DB.connect

lib/user.rb

@@ -1,29 +1,17 @@
 # frozen_string_literal: true
 
 # User
-class User
-  attr_reader :id, :name
-
-  def initialize(user_name:)
-    @id = UserId.new(SecureRandom.uuid.to_str)
-    @name = user_name
-  end
-
-  def change_name(name)
-    raise if name.nil?
-
-    @name = name
-  end
-
-  def eql?(other)
-    @id == other.id
+class User < ActiveRecord::Base
+  def user_name
+    @user_name = UserName.new(name)
   end
 
-  def ==(other)
-    other.equal?(self) || other.instance_of?(self.class) && other.id == id
+  def user_name=(user_name)
+    self.name = user_name.value
+    @user_name = user_name
   end
 
-  def hash
-    id.hash
+  def change_name(name)
+    self.name = name
   end
 end

lib/user_repository.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+class InitialSchema < ActiveRecord::Migration[4.2]
+  def self.up
+    create_table :users do |t|
+      t.string :name
+    end
+  end
+
+  def self.down
+    drop_table :users
+  end
+end
+
+class UserRepository
+  def initialize; end
+
+  def save(user)
+    user.save
+  end
+
+  def find(user)
+    User.find_by(name: user.name)
+  end
+
+  def destroy; end
+end

lib/user_service.rb

@@ -2,10 +2,12 @@
 
 # UserService
 class UserService
+  def initialize(user_repository:)
+    @repository = user_repository
+  end
+
   def exist?(user)
-    db = SQLite3::Database.new('sns.db')
-    sql = 'SELECT * FROM USERS WHERE name = :name'
-    result = db.execute(sql, name: user.name.value)
-    !result.empty?
+    result = @repository.find(user)
+    result.present?
   end
 end

main.rb

@@ -1 +1,6 @@
-require './test/user_test.rb'
+# frozen_string_literal: true
+
+require './test/user_test'
+require './test/user_service_test'
+require './test/activerecord_test'
+require './test/rom_test'

test/activerecord_test.rb

@@ -0,0 +1,43 @@
+# frozen_string_literal: true
+
+require './test/test_helper'
+require './lib/sns.rb'
+
+class ActiverecordTest < Minitest::Test
+  describe '学習用テスト' do
+    def setup
+      TestDB.connect
+      TestDB.create
+    end
+
+    def test_ユーザーを登録する
+      User.create(user_name: UserName.new('Bob'))
+      user = User.find_by(name: 'Bob')
+
+      assert_equal 'Bob', user.name
+    end
+
+    def test_ユーザーを更新する
+      User.create(user_name: UserName.new('Bob'))
+      user = User.find_by(name: 'Bob')
+      user.name = 'Alice'
+      user.save
+      user = User.find_by(name: 'Alice')
+
+      assert_equal 'Alice', user.name
+    end
+
+    def test_ユーザーを削除する
+      User.create(user_name: UserName.new('Bob'))
+      user = User.find_by(name: 'Bob')
+      user.destroy
+      user = User.find_by(name: 'Bob')
+
+      assert user.nil?
+    end
+
+    def teardown
+      TestDB.destroy
+    end
+  end
+end