# Handling Errors { #handling-errors }

There are many situations in which you need to notify an error to a client that is using your API.

This client could be a browser with a frontend, a code from someone else, an IoT device, etc.

You could need to tell the client that:

* The client doesn't have enough privileges for that operation.
* The client doesn't have access to that resource.
* The item the client was trying to access doesn't exist.
* etc.

	}

	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 {

		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 {

	timedout := OperationTimedOut{}
	if err != nil && !errors.Is(err, context.DeadlineExceeded) && !errors.As(err, &timedout) {
		if len(dui.BucketsUsage) > 0 {
			internalLogOnceIf(GlobalContext, fmt.Errorf("unable to retrieve usage information for bucket: %s, relying on older value cached in-memory: err(%v)", bucket, err), "bucket-usage-cache-"+bucket)
		} else {

		if cdiskCount != testCase.diskCount {
			t.Errorf("Test %d: Expected %d, got %d", i+1, testCase.diskCount, cdiskCount)
		}
	}
}

// Test for reduceErrs, reduceErr reduces collection
// of errors into a single maximal error with in the list.
func TestReduceErrs(t *testing.T) {
	canceledErrs := make([]error, 0, 5)
	for i := range 5 {
		canceledErrs = append(canceledErrs, fmt.Errorf("error %d: %w", i, context.Canceled))
	}

		var last User
		if err := DB.Where("name = ?", "find").Last(&last).Error; err != nil {
			t.Errorf("errors happened when query last: %v", err)
		} else {
			CheckUser(t, last, users[2])
		}
	})

	var all []User
	if err := DB.Where("name = ?", "find").Find(&all).Error; err != nil || len(all) != 3 {
		t.Errorf("errors happened when query find: %v, length: %v", err, len(all))
	} else {
		for idx, user := range users {

		if offsetBeginString[0] == '+' {
			return nil, fmt.Errorf("Byte position ('%s') must not have a sign", offsetBeginString)
		} else if offsetBegin, err = strconv.ParseInt(offsetBeginString, 10, 64); err != nil {
			return nil, fmt.Errorf("'%s' does not have a valid first byte position value", rangeString)
		} else if offsetBegin < 0 {
			return nil, fmt.Errorf("First byte position is negative ('%d')", offsetBegin)
		}
	}

		t.Errorf("errors happened when delete: %v", err)
	}

	if err := DB.Delete(&User{}).Error; err != gorm.ErrMissingWhereClause {
		t.Errorf("errors happened when delete: %v", err)
	}

	if err := DB.Where("id = ?", users[0].ID).First(&result).Error; err == nil || !errors.Is(err, gorm.ErrRecordNotFound) {
		t.Errorf("should returns record not found error, but got %v", err)
	}
}

func TestDeleteWithTable(t *testing.T) {

	aes128cbcID        = "aes128-cbc"
	tripledescbcID     = "3des-cbc"
)

var (
	errSFTPPublicKeyBadFormat = errors.New("the public key provided could not be parsed")
	errSFTPUserHasNoPolicies  = errors.New("no policies present on this account")
	errSFTPLDAPNotEnabled     = errors.New("ldap authentication is not enabled")
)

// if the sftp parameter --trusted-user-ca-key is set, then

	}{
		{":54321", nil},
		{"localhost:54321", nil},
		{"0.0.0.0:9000", nil},
		{":0", nil},
		{"localhost", nil},
		{"", fmt.Errorf("invalid argument")},
		{"example.org:54321", fmt.Errorf("host in server address should be this server")},
		{":-10", fmt.Errorf("port must be between 0 to 65535")},
	}

	for _, testCase := range testCases {
		t.Run("", func(t *testing.T) {