other

backend/models/PromotionUse.model.js

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+import mongoose from 'mongoose';
+
+const PromotionUseSchema = new mongoose.Schema(
+  {
+    promotionId: {
+      type: mongoose.Schema.Types.ObjectId,
+      ref: 'Promotion',
+      required: [true, 'Promotion ID is required']
+    },
+    orderId: {
+      type: mongoose.Schema.Types.ObjectId,
+      ref: 'Order',
+      required: [true, 'Order ID is required']
+    },
+    userId: {
+      type: mongoose.Schema.Types.ObjectId,
+      ref: 'User',
+      required: [true, 'User ID is required']
+    },
+    storeId: {
+      type: mongoose.Schema.Types.ObjectId,
+      ref: 'Store',
+      required: [true, 'Store ID is required']
+    },
+    code: {
+      type: String,
+      required: [true, 'Promotion code is required']
+    },
+    discountType: {
+      type: String,
+      enum: ['percentage', 'fixed'],
+      required: [true, 'Discount type is required']
+    },
+    discountValue: {
+      type: Number,
+      required: [true, 'Discount value is required']
+    },
+    discountAmount: {
+      type: Number,
+      required: [true, 'Discount amount is required']
+    },
+    orderTotal: {
+      type: Number,
+      required: [true, 'Order total is required']
+    }
+  },
+  {
+    timestamps: true
+  }
+);
+
+const PromotionUse = mongoose.model('PromotionUse', PromotionUseSchema);
+
+export default PromotionUse;