feat(promotion code): Promotion code system done

I added the features for users to use promotion code
and for promoters to create on their events.
May be rewrite to discount code?

db/migrate/20250823170409_create_orders.rb

@@ -1,14 +1,15 @@
 class CreateOrders < ActiveRecord::Migration[8.0]
   def change
     create_table :orders do |t|
-      t.references :user, null: false, foreign_key: false
-      t.references :event, null: false, foreign_key: false
       t.string :status, null: false, default: "draft"
       t.integer :total_amount_cents, null: false, default: 0
       t.integer :payment_attempts, null: false, default: 0
       t.timestamp :expires_at
       t.timestamp :last_payment_attempt_at
 
+      t.references :user, null: false, foreign_key: false
+      t.references :event, null: false, foreign_key: false
+
       t.timestamps
     end
 

db/migrate/20250928180837_create_promotion_codes.rb

@@ -7,8 +7,12 @@ class CreatePromotionCodes < ActiveRecord::Migration[8.0]
       t.boolean :active, default: true, null: false
       t.integer :usage_limit, default: nil
       t.integer :uses_count, default: 0, null: false
-      t.datetime :created_at, null: false
-      t.datetime :updated_at, null: false
+
+      # Reference user(promoter) who has created the promotion code
+      t.references :user, null: false, foreign_key: true
+      t.references :event, null: false, foreign_key: true
+
+      t.timestamps
     end
 
     # Unique index for code

db/schema.rb

@@ -44,13 +44,13 @@ ActiveRecord::Schema[8.0].define(version: 2025_09_28_181311) do
   end
 
   create_table "orders", charset: "utf8mb4", collation: "utf8mb4_uca1400_ai_ci", force: :cascade do |t|
-    t.bigint "user_id", null: false
-    t.bigint "event_id", null: false
     t.string "status", default: "draft", null: false
     t.integer "total_amount_cents", default: 0, null: false
     t.integer "payment_attempts", default: 0, null: false
     t.timestamp "expires_at"
     t.timestamp "last_payment_attempt_at"
+    t.bigint "user_id", null: false
+    t.bigint "event_id", null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.index ["event_id", "status"], name: "idx_orders_event_status"
@@ -67,9 +67,13 @@ ActiveRecord::Schema[8.0].define(version: 2025_09_28_181311) do
     t.boolean "active", default: true, null: false
     t.integer "usage_limit"
     t.integer "uses_count", default: 0, null: false
+    t.bigint "user_id", null: false
+    t.bigint "event_id", null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.index ["code"], name: "index_promotion_codes_on_code", unique: true
+    t.index ["event_id"], name: "index_promotion_codes_on_event_id"
+    t.index ["user_id"], name: "index_promotion_codes_on_user_id"
   end
 
   create_table "ticket_types", charset: "utf8mb4", collation: "utf8mb4_uca1400_ai_ci", force: :cascade do |t|
@@ -128,4 +132,6 @@ ActiveRecord::Schema[8.0].define(version: 2025_09_28_181311) do
 
   add_foreign_key "order_promotion_codes", "orders"
   add_foreign_key "order_promotion_codes", "promotion_codes"
+  add_foreign_key "promotion_codes", "events"
+  add_foreign_key "promotion_codes", "users"
 end

db/seeds.rb

@@ -280,3 +280,26 @@ TicketType.find_or_create_by!(event: belle_epoque_october_event, name: "Entry 10
 end
 
 puts "Created 3 additional events from Bizouk with ticket types"
+
+# Create promotion codes for events
+# Promotion code for belle_epoque_event
+PromotionCode.find_or_create_by!(code: "BELLE10") do |pc|
+  pc.discount_amount_cents = 1000  # 10€ discount
+  pc.expires_at = belle_epoque_event.start_time + 1.day
+  pc.active = true
+  pc.usage_limit = 20
+  pc.user = promoter
+  pc.event = belle_epoque_october_event
+end
+
+# Promotion code for belle_epoque_october_event
+PromotionCode.find_or_create_by!(code: "OCTOBRE5") do |pc|
+  pc.discount_amount_cents = 500  # 5€ discount
+  pc.expires_at = belle_epoque_october_event.start_time + 1.day
+  pc.active = true
+  pc.usage_limit = 30
+  pc.user = promoter
+  pc.event = belle_epoque_october_event
+end
+
+puts "Created promotion codes for events"