feat: prevent coupon usage if maximum limit is exceeded

models/baseModels/AppliedCouponCodes/AppliedCouponCodes.ts

@@ -23,10 +23,18 @@ export class AppliedCouponCodes extends InvoiceItem {
           'pricingRule',
           'validFrom',
           'validTo',
+          'maximumUse',
+          'used',
         ],
         filters: { name: value as string },
       });
 
+      if ((coupon[0]?.maximumUse as number) <= (coupon[0]?.used as number)) {
+        throw new ValidationError(
+          'Coupon code has been used maximum number of times'
+        );
+      }
+
       const applicableCouponCodesNames = await getApplicableCouponCodesName(
         value as string,
         this.parentdoc as SalesInvoice

models/baseModels/Invoice/Invoice.ts

@@ -236,6 +236,10 @@ export abstract class Invoice extends Transactional {
 
     await this._updateIsItemsReturned();
     await this._createLoyaltyPointEntry();
+
+    if (this.schemaName === ModelNameEnum.SalesInvoice) {
+      this.updateUsedCountOfCoupons();
+    }
   }
 
   async afterCancel() {
@@ -553,6 +557,17 @@ export abstract class Invoice extends Transactional {
     return newReturnDoc;
   }
 
+  updateUsedCountOfCoupons() {
+    this.coupons?.map(async (coupon) => {
+      const couponDoc = await this.fyo.doc.getDoc(
+        ModelNameEnum.CouponCode,
+        coupon.coupons
+      );
+
+      await couponDoc.setAndSync({ used: (couponDoc.used as number) + 1 });
+    });
+  }
+
   async _updateIsItemsReturned() {
     if (!this.isReturn || !this.returnAgainst || this.isQuote) {
       return;