Add SQL query for average cost retrieval and generate TriggerLog model

src/products/products.service.ts

@@ -30,8 +30,9 @@ export class ProductsService {
 
   async findAll() {
     const items = await this.prisma.product.findMany({
-      include: { brand: true, category: true },
+      include: { brand: true, category: true, stockBalances: true },
     })
+
     const mapped = items.map(p => {
       const { brandId, categoryId, ...rest } = p as any
       const brand: ShortEntity | null = p.brand
@@ -40,7 +41,12 @@ export class ProductsService {
       const category: ShortEntity | null = p.category
         ? { id: p.category.id, name: p.category.name }
         : null
-      return { ...rest, brand, category }
+      const stock =
+        p.stockBalances && p.stockBalances.length > 0
+          ? p.stockBalances.reduce((acc, sb) => acc + Number(sb.quantity), 0)
+          : 0
+
+      return { ...rest, brand, category, stock }
     })
     return ResponseMapper.list(mapped)
   }
@@ -48,7 +54,7 @@ export class ProductsService {
   async findOne(id: number) {
     const p = await this.prisma.product.findUnique({
       where: { id },
-      include: { brand: true, category: true, productCharges: true },
+      include: { brand: true, category: true, stockBalances: true },
     })
     if (!p) return null
 
@@ -63,7 +69,15 @@ export class ProductsService {
       ...rest,
       brand,
       category,
-      count: p.productCharges.reduce((acc, charge) => acc + Number(charge.count), 0.0),
+      stock:
+        p.stockBalances && p.stockBalances.length > 0
+          ? p.stockBalances.reduce((acc, sb) => acc + Number(sb.quantity), 0)
+          : 0,
+      avgCost:
+        p.stockBalances && p.stockBalances.length > 0
+          ? p.stockBalances.reduce((acc, sb) => acc + Number(sb.avgCost), 0) /
+            p.stockBalances.length
+          : 0,
     })
   }