Der Exceptionhandler wird einen `Request` und die Exception entgegennehmen.

{* ../../docs_src/handling_errors/tutorial004.py hl[2,14:16] *}

Wenn Sie nun `/items/foo` besuchen, erhalten Sie statt des Default-JSON-Errors:

```JSON
{
    "detail": [
        {
            "loc": [
                "path",
                "item_id"
            ],
            "msg": "value is not a valid integer",

	if err := DB.Create(&product).Error; err == nil {
		t.Errorf("should got failed to save, but error is nil")
	}

	if DB.First(&Product4{}, "name = ?", product.Name).Error == nil {
		t.Errorf("should got RecordNotFound, but got nil")
	}

	product = Product4{Name: "Product-2", Price: 100, Item: ProductItem{Code: "valid"}}
	if err := DB.Create(&product).Error; err != nil {
		t.Errorf("should create product, but got error %v", err)
	}

				Description:    err.Error(),
				HTTPStatusCode: http.StatusBadRequest,
			}
		case errors.Is(err, kes.ErrKeyExists):
			apiErr = APIError{
				Code:           "XMinioKMSKeyExists",
				Description:    err.Error(),
				HTTPStatusCode: http.StatusConflict,
			}

		// Tier admin API errors
		case errors.Is(err, madmin.ErrTierNameEmpty):
			apiErr = APIError{
				Code:           "XMinioAdminTierNameEmpty",

		t.Errorf("Should not raise any error, but got %v", err)
	}

	if result.Age.Int64 != 18 {
		t.Errorf("should update age to 18")
	}

	var result2 ScannerValuerStruct
	if err := DB.First(&result2, result.ID).Error; err != nil {
		t.Errorf("got error %v when query with %v", err, result.ID)
	}

			if err == io.EOF {
				if extracted {
					return nil
				}
				return errors.New("no data found on stream")
			}
			if errors.Is(err, estream.ErrNoKey) {
				fmt.Println("Skipping", stream.Name, "no private key")
				if err := stream.Skip(); err != nil {
					return fmt.Errorf("stream skip: %w", err)
				}
				continue
			}
			return fmt.Errorf("next stream: %w", err)
		}

		t.Errorf("should return record not found error, but got %v", err)
	}

	DB.Delete(&namedUser)

	var result8 NamedUser
	if err := DB.Where("name1 = @name OR name2 = @name", map[string]interface{}{"name": "jinzhu-new"}).First(&result8).Error; err == nil || !errors.Is(err, gorm.ErrRecordNotFound) {
		t.Errorf("should return record not found error, but got %v", err)

	}

	if u1.ID == 0 {
		t.Errorf("user's primary key should has value after create, got : %v", u1.ID)
	}

	if u1.CreatedAt.IsZero() {
		t.Errorf("user's created at should be not zero")
	}

	if u1.UpdatedAt.IsZero() {
		t.Errorf("user's updated at should be not zero")
	}

	var newUser User
	if err := DB.Where("id = ?", u1.ID).First(&newUser).Error; err != nil {
		t.Fatalf("errors happened when query: %v", err)
	} else {

		if user.Account.Number != "" {
			t.Errorf("No account should found for user %v but got %v", idx+2, user.Account.Number)
		}
	}

	CheckUser(t, users2[0], users[0])

	var users3 []User
	if err := DB.Preload("Account", func(tx *gorm.DB) *gorm.DB {
		return tx.Table("accounts AS a").Select("a.*")
	}).Find(&users3, "id IN ?", userIDs).Error; err != nil {
		t.Errorf("failed to query, got error %v", err)
	}

	if err := checkDiskFatalErrs(sErrs); err != nil {
		return nil, err
	}

	for i, err := range sErrs {
		if err != nil && !errors.Is(err, errXLBackend) && !errors.Is(err, errUnformattedDisk) {
			if errors.Is(err, errDiskNotFound) && verboseLogging {
				if globalEndpoints.NEndpoints() > 1 {

		return "", err
	}
	if meta.Version != formatMetaVersionV1 {
		return "", fmt.Errorf(`format.Version expected: %s, got: %s`, formatMetaVersionV1, meta.Version)
	}
	if meta.Format != formatBackendErasure && meta.Format != formatBackendErasureSingle {