Tweak makeBid to upsert instead of create

backend/src/api/bid/services/bid.ts

@@ -5,15 +5,31 @@
 import { factories } from "@strapi/strapi";
 
 export default factories.createCoreService("api::bid.bid", ({ strapi }) => ({
-  makeBid(params) {
-    return strapi.service("api::bid.bid").create({
-      data: {
-        value: params.bidValue,
-        user: params.user,
-        product: params.product,
-        publishedAt: new Date(),
-      },
-    });
+  async makeBid(params) {
+    const currentBids: any[] = await strapi.entityService.findMany(
+      "api::bid.bid",
+      {
+        filters: { product: params.product },
+      }
+    );
+
+    if (currentBids.length === 0) {
+      return strapi.service("api::bid.bid").create({
+        data: {
+          value: params.bidValue,
+          user: params.user,
+          product: params.product,
+          publishedAt: new Date(),
+        },
+      });
+    } else {
+      return strapi.entityService.update("api::bid.bid", currentBids[0].id, {
+        data: {
+          value: params.bidValue,
+          user: params.user,
+        },
+      });
+    }
   },
 
   getWinner(params) {

backend/src/api/product/services/product.ts

@@ -30,6 +30,7 @@ export default factories.createCoreService(
         },
       });
     },
+
     async findAndUpdateBidPrice(found, price) {
       return strapi.entityService.update("api::product.product", found.id, {
         data: {