{* ../../docs_src/query_params_str_validations/tutorial008.py hl[13] *}

## 별칭 매개변수

매개변수가 `item-query`이길 원한다고 가정해 봅시다.

마치 다음과 같습니다:

```
http://127.0.0.1:8000/items/?item-query=foobaritems
```

그러나 `item-query`은 유효한 파이썬 변수 이름이 아닙니다.

가장 가까운 것은 `item_query`일 겁니다.

하지만 정확히`item-query`이길 원합니다...

이럴 경우 `alias`를 선언할 수 있으며, 해당 별칭은 매개변수 값을 찾는 데 사용됩니다:

						}
					}
				}
				for obj := range walkCh {
					if obj.Item.DeleteMarker || !obj.Item.VersionPurgeStatus.Empty() || obj.Item.Size >= int64(smallerThan) {
						slowCh <- obj
						continue
					}

					batch = append(batch, obj.Item)

					if len(batch) < *r.Source.Snowball.Batch {
						continue
					}
					writeFn(batch)

        "openapi": "3.1.0",
        "info": {"title": "FastAPI", "version": "0.1.0"},
        "paths": {
            "/items/": {
                "post": {
                    "summary": "Create Item",
                    "operationId": "create_item_items__post",
                    "requestBody": {
                        "content": {
                            "application/json": {

```JSON
{
  "item": "The Foo Wrestlers"
}
```

Но если клиент запросит `http://example.com/items/bar` (несуществующий `item_id` `"bar"`), то он получит статус-код 404 (ошибка "не найдено") и JSON-ответ в виде:

```JSON
{
  "detail": "Item not found"
}
```

/// tip | Подсказка

	// the last result index sent to client
	lastSentResultIndex int64

	// Number of total items scanned against item type
	scannedItemsMap map[madmin.HealItemType]int64

	// Number of total items healed against item type
	healedItemsMap map[madmin.HealItemType]int64

	// Number of total items where healing failed against item type
	healFailedItemsMap map[madmin.HealItemType]int64

	// The time of the last scan/heal activity

			item.heal.bitrot = f.scanMode == madmin.HealDeepScan

			sz, err := f.getSize(item)
			if err != nil && err != errIgnoreFileContrib {
				wait() // wait to proceed to next entry.
				if err != errSkipFile && f.dataUsageScannerDebug {
					console.Debugf(scannerLogPrefix+" getSize \"%v/%v\" returned err: %v\n", bucket, item.objectPath(), err)
				}
				return nil
			}

        return encoded_dict
    if isinstance(obj, (list, set, frozenset, GeneratorType, tuple, deque)):
        encoded_list = []
        for item in obj:
            encoded_list.append(
                jsonable_encoder(
                    item,
                    include=include,
                    exclude=exclude,
                    by_alias=by_alias,
                    exclude_unset=exclude_unset,

		return nil
	}

	if item.Policy != nil {
		meta.PolicyConfigJSON = item.Policy
		meta.PolicyConfigUpdatedAt = item.UpdatedAt
	}

	if item.Versioning != nil {
		configData, err := base64.StdEncoding.DecodeString(*item.Versioning)
		if err != nil {
			return wrapSRErr(err)
		}
		meta.VersioningConfigXML = configData
		meta.VersioningConfigUpdatedAt = item.UpdatedAt

Wie in `item.model_dump(exclude_unset=True)`.

Das wird ein <abbr title="Dictionary – Zuordnungstabelle: In anderen Sprachen auch Hash, Map, Objekt, Assoziatives Array genannt">`dict`</abbr> erstellen, mit nur den Daten, die gesetzt wurden, als das `item`-Modell erstellt wurde, Defaultwerte ausgeschlossen.

		}

		// Remove filename which is the meta file.
		item.transformMetaDir()

		fivs, err := getFileInfoVersions(buf, item.bucket, item.objectPath(), false)
		metaDataPoolPut(buf)
		if err != nil {
			res["err"] = err.Error()
			return sizeSummary{}, errSkipFile
		}

		versioned := vcfg != nil && vcfg.Versioned(item.objectPath())
		objInfos := make([]ObjectInfo, len(fivs.Versions))