# 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 langs, err := gorm.G[Language](DB).Where("code = ?", lang.Code).Find(ctx); err != nil {
		t.Errorf("no error should happen when find languages with code, but got %v", err)
	} else if len(langs) != 1 {
		t.Errorf("should only find only 1 languages, but got %+v", langs)
	} else if langs[0].Name != "upsert-new" {
		t.Errorf("should update name on conflict, but got name %+v", langs[0].Name)
	}
}

	}
	if len(data) <= 4 {
		return fmt.Errorf("rebalanceMeta: no data")
	}

	// Read header
	switch binary.LittleEndian.Uint16(data[0:2]) {
	case rebalMetaFmt:
	default:
		return fmt.Errorf("rebalanceMeta: unknown format: %d", binary.LittleEndian.Uint16(data[0:2]))
	}
	switch binary.LittleEndian.Uint16(data[2:4]) {
	case rebalMetaVer:
	default:

		if !disk.IsOnline() {
			continue
		}
		uploadIDs, err = disk.ListDir(ctx, bucket, minioMetaMultipartBucket, er.getMultipartSHADir(bucket, object), -1)
		if err != nil {
			if errors.Is(err, errDiskNotFound) {
				continue
			}
			if errors.Is(err, errFileNotFound) {
				return result, nil
			}
			return result, toObjectErr(err, bucket, object)
		}
		break
	}

	for i := range uploadIDs {

package cmd

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"net/http"
	"strconv"
	"strings"

	"github.com/minio/mux"
	"github.com/minio/pkg/v3/env"
	"github.com/minio/pkg/v3/policy"
)

var (
	errRebalanceDecommissionAlreadyRunning = errors.New("Rebalance cannot be started, decommission is already in progress")

			if written == partLength {
				if errors.Is(err, errFileNotFound) || errors.Is(err, errFileCorrupt) {
					healOnce.Do(func() {
						globalMRFState.addPartialOp(PartialOperation{
							Bucket:     bucket,
							Object:     object,
							VersionID:  fi.VersionID,
							Queued:     time.Now(),
							SetIndex:   er.setIndex,
							PoolIndex:  er.poolIndex,
							BitrotScan: errors.Is(err, errFileCorrupt),
						})

/// tip

Some editors check for unused function parameters, and show them as errors.

Using these `dependencies` in the *path operation decorator* you can make sure they are executed while avoiding editor/tooling errors.

It might also help avoid confusion for new developers that see an unused parameter in your code and could think it's unnecessary.

///

/// info

		if err != nil {
			return opts, fmt.Errorf("Unable to parse %s, failed with %w", xhttp.MinIOSourceMTime, err)
		}
	}
	retaintimeStr := strings.TrimSpace(hdr.Get(xhttp.MinIOSourceObjectRetentionTimestamp))
	var retaintimestmp time.Time
	if retaintimeStr != "" {
		retaintimestmp, err = time.Parse(time.RFC3339, retaintimeStr)
		if err != nil {

<img src="/img/tutorial/generate-clients/image08.png">

## Benefits { #benefits }

When using the automatically generated clients, you would get **autocompletion** for:

* Methods.
* Request payloads in the body, query parameters, etc.
* Response payloads.

You would also have **inline errors** for everything.

These functions are there (instead of just using the classes directly) so that your editor doesn't mark errors about their types.

That way you can use your normal editor and coding tools without having to add custom configurations to disregard those errors.