Use the friendly ID gem for contest slugs

db/migrate/20250326162646_remove_slug_from_contests.rb

@@ -0,0 +1,5 @@
+class RemoveSlugFromContests < ActiveRecord::Migration[8.0]
+  def change
+    remove_column :contests, :slug, :string
+  end
+end

db/migrate/20250326162828_add_slug_to_contests.rb

@@ -0,0 +1,6 @@
+class AddSlugToContests < ActiveRecord::Migration[8.0]
+  def change
+    add_column :contests, :slug, :string
+    add_index :contests, :slug, unique: true
+  end
+end

db/migrate/20250326162920_create_friendly_id_slugs.rb

@@ -0,0 +1,21 @@
+MIGRATION_CLASS =
+  if ActiveRecord::VERSION::MAJOR >= 5
+    ActiveRecord::Migration["#{ActiveRecord::VERSION::MAJOR}.#{ActiveRecord::VERSION::MINOR}"]
+  else
+    ActiveRecord::Migration
+  end
+
+class CreateFriendlyIdSlugs < MIGRATION_CLASS
+  def change
+    create_table :friendly_id_slugs do |t|
+      t.string :slug, null: false
+      t.integer :sluggable_id, null: false
+      t.string :sluggable_type, limit: 50
+      t.string :scope
+      t.datetime :created_at
+    end
+    add_index :friendly_id_slugs, [ :sluggable_type, :sluggable_id ]
+    add_index :friendly_id_slugs, [ :slug, :sluggable_type ], length: { slug: 140, sluggable_type: 50 }
+    add_index :friendly_id_slugs, [ :slug, :sluggable_type, :scope ], length: { slug: 70, sluggable_type: 50, scope: 70 }, unique: true
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.0].define(version: 2025_03_26_153736) do
+ActiveRecord::Schema[8.0].define(version: 2025_03_26_162920) do
   create_table "active_storage_attachments", force: :cascade do |t|
     t.string "name", null: false
     t.string "record_type", null: false
@@ -71,9 +71,21 @@ ActiveRecord::Schema[8.0].define(version: 2025_03_26_153736) do
     t.boolean "team", default: false
     t.boolean "allow_registration", default: false
     t.string "slug"
+    t.index ["slug"], name: "index_contests_on_slug", unique: true
     t.index ["user_id"], name: "index_contests_on_user_id"
   end
 
+  create_table "friendly_id_slugs", force: :cascade do |t|
+    t.string "slug", null: false
+    t.integer "sluggable_id", null: false
+    t.string "sluggable_type", limit: 50
+    t.string "scope"
+    t.datetime "created_at"
+    t.index ["slug", "sluggable_type", "scope"], name: "index_friendly_id_slugs_on_slug_and_sluggable_type_and_scope", unique: true
+    t.index ["slug", "sluggable_type"], name: "index_friendly_id_slugs_on_slug_and_sluggable_type"
+    t.index ["sluggable_type", "sluggable_id"], name: "index_friendly_id_slugs_on_sluggable_type_and_sluggable_id"
+  end
+
   create_table "puzzles", force: :cascade do |t|
     t.string "name"
     t.datetime "created_at", null: false