feat: add printer types

internal/validator/product_validator.go

@@ -59,8 +59,8 @@ func (v *ProductValidatorImpl) ValidateCreateProductRequest(req *contract.Create
 		return errors.New("image_url cannot exceed 500 characters"), constants.MalformedFieldErrorCode
 	}
 
-	if req.PrinterType != nil && len(*req.PrinterType) > 50 {
-		return errors.New("printer_type cannot exceed 50 characters"), constants.MalformedFieldErrorCode
+	if err, code := validatePrinterTypes(req.PrinterTypes); err != nil {
+		return err, code
 	}
 
 	if err, code := validateSellBy(req.SellBy, req.UnitID); err != nil {
@@ -70,6 +70,18 @@ func (v *ProductValidatorImpl) ValidateCreateProductRequest(req *contract.Create
 	return nil, ""
 }
 
+// validatePrinterTypes holds each printer to the 50 characters the single printer_type
+// column allowed.
+func validatePrinterTypes(printerTypes []string) (error, string) {
+	for _, printerType := range printerTypes {
+		if len(strings.TrimSpace(printerType)) > 50 {
+			return errors.New("each printer_types entry cannot exceed 50 characters"), constants.MalformedFieldErrorCode
+		}
+	}
+
+	return nil, ""
+}
+
 // validateSellBy checks how a product is sold and that it carries what that choice
 // needs. A weight-based product without a unit would produce order lines with no unit
 // to print, so the receipt could show "4,2" with no idea of what.
@@ -100,7 +112,7 @@ func (v *ProductValidatorImpl) ValidateUpdateProductRequest(req *contract.Update
 	// At least one field should be provided for update
 	if req.CategoryID == nil && req.SKU == nil && req.Name == nil && req.Description == nil &&
 		req.Price == nil && req.Cost == nil && req.BusinessType == nil && req.ImageURL == nil &&
-		req.PrinterType == nil && req.PrintToChecker == nil && req.UnitID == nil &&
+		req.PrinterTypes == nil && req.PrintToChecker == nil && req.UnitID == nil &&
 		req.SellBy == nil && req.Metadata == nil && req.IsActive == nil {
 		return errors.New("at least one field must be provided for update"), constants.MissingFieldErrorCode
 	}
@@ -134,8 +146,8 @@ func (v *ProductValidatorImpl) ValidateUpdateProductRequest(req *contract.Update
 		return errors.New("image_url cannot exceed 500 characters"), constants.MalformedFieldErrorCode
 	}
 
-	if req.PrinterType != nil && len(*req.PrinterType) > 50 {
-		return errors.New("printer_type cannot exceed 50 characters"), constants.MalformedFieldErrorCode
+	if err, code := validatePrinterTypes(req.PrinterTypes); err != nil {
+		return err, code
 	}
 
 	// Only the value is checked here. Whether the product ends up with a unit depends on