Add GameSystem model

app/models/game_system.rb

@@ -0,0 +1,3 @@
+class GameSystem < ApplicationRecord
+  validates :name, presence: true
+end

db/migrate/20240526084840_create_game_systems.rb

@@ -0,0 +1,9 @@
+class CreateGameSystems < ActiveRecord::Migration[7.1]
+  def change
+    create_table :game_systems do |t|
+      t.string :name, null: false
+
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -10,10 +10,16 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.1].define(version: 2024_04_14_122652) do
+ActiveRecord::Schema[7.1].define(version: 2024_05_26_084840) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
+  create_table "game_systems", force: :cascade do |t|
+    t.string "name", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
   create_table "users", force: :cascade do |t|
     t.string "username", limit: 20, null: false
     t.string "password_digest", limit: 200, null: false

test/fixtures/game_systems.yml

@@ -0,0 +1,2 @@
+troika:
+  name: Troika

test/models/game_system_test.rb

@@ -0,0 +1,7 @@
+require "test_helper"
+
+class GameSystemTest < ActiveSupport::TestCase
+  test "name must exist" do
+    assert_must_exist(game_systems(:troika), :name)
+  end
+end