transform string to number

src/main.ts

@@ -26,7 +26,12 @@ async function bootstrap() {
   await app.register(fastifyCookie);
 
   await app.register(multipart);
-  app.useGlobalPipes(new ValidationPipe());
+  app.useGlobalPipes(
+    new ValidationPipe({
+      transform: true,
+      whitelist: true,
+    }),
+  );
 
   app.useGlobalInterceptors(
     new ResponseInterceptor(),

src/modules/products/dto/create-product.dto.ts

@@ -3,6 +3,7 @@ import {
   ArrayMinSize,
   IsArray,
   IsBoolean,
+  IsDefined,
   IsEnum,
   IsInt,
   IsNotEmpty,
@@ -118,12 +119,12 @@ export class CreateProductDto {
   @ApiPropertyOptional({ example: 1 })
   order?: number;
 
-  @IsOptional()
+  @IsDefined()
   @IsNumber({ maxDecimalPlaces: 3 })
   @Min(0.001)
   @Type(() => Number)
-  @ApiPropertyOptional({ description: 'Maximum quantity per order; omit or null for unlimited', example: 5 })
+  @ApiProperty({ description: 'Maximum quantity per order', example: 5 })
-  maxPurchaseQuantity?: number | null;
+  maxPurchaseQuantity: number;
 
   @IsOptional()
   @IsNumber({ maxDecimalPlaces: 3 })
@@ -142,11 +143,11 @@ export class CreateProductDto {
   @ApiPropertyOptional({ example: PurchaseUnit.NUMBER })
   purchaseUnit?: PurchaseUnit;
 
-  @IsOptional()
+  @IsDefined()
   @IsNumber({ maxDecimalPlaces: 3 })
   @Min(0.001)
   @Type(() => Number)
-  @ApiPropertyOptional({ description: 'Minimum quantity per order; omit or null for unlimited', example: 0.5 })
+  @ApiProperty({ description: 'Minimum quantity per order', example: 0.5 })
-  minPurchaseQuantity?: number | null;
+  minPurchaseQuantity: number;
 
 }