"k3": Item(aliased_name="baz", price=2.0, owner_ids=[1, 2, 3]),
    }


@app.get(
    "/items/valid-exclude-unset", response_model=Item, response_model_exclude_unset=True
)
def get_valid_exclude_unset():
    return Item(aliased_name="valid", price=1.0)


@app.get(
    "/items/coerce-exclude-unset",
    response_model=Item,
    response_model_exclude_unset=True,
)
def get_coerce_exclude_unset():

 *
 * @author Jon Noack
 */
@GwtIncompatible
final class CompactHashing {
  private CompactHashing() {}

  /** Indicates blank table entries. */
  static final byte UNSET = 0;

  /** Number of bits used to store the numbers of hash table bits (max 30). */
  private static final int HASH_TABLE_BITS_MAX_BITS = 5;

  /** Use high bits of metadata for modification count. */

 *
 * @author Jon Noack
 */
@GwtIncompatible
final class CompactHashing {
  private CompactHashing() {}

  /** Indicates blank table entries. */
  static final byte UNSET = 0;

  /** Number of bits used to store the numbers of hash table bits (max 30). */
  private static final int HASH_TABLE_BITS_MAX_BITS = 5;

  /** Use high bits of metadata for modification count. */

     * [addSubjectAlternativeName]. If unset a random string will be used.
     *
     * [rfc_2818]: https://tools.ietf.org/html/rfc2818
     */
    fun commonName(cn: String) =
      apply {
        this.commonName = cn
      }

    /** Sets the certificate's organizational unit (OU). If unset this field will be omitted. */
    fun organizationalUnit(ou: String) =
      apply {

 * </ul>
 *
 * <p>Invalid:
 *
 * <ul>
 *   <li>Expired: time expired (key/value may still be set)
 *   <li>Collected: key/value was partially collected, but not yet cleaned up
 *   <li>Unset: marked as unset, awaiting cleanup or reuse
 * </ul>
 */
@GwtIncompatible
@J2ktIncompatible
interface ReferenceEntry<K, V> {
  /** Returns the value reference from this entry. */

 * </ul>
 *
 * <p>Invalid:
 *
 * <ul>
 *   <li>Expired: time expired (key/value may still be set)
 *   <li>Collected: key/value was partially collected, but not yet cleaned up
 *   <li>Unset: marked as unset, awaiting cleanup or reuse
 * </ul>
 */
@GwtIncompatible
@J2ktIncompatible
interface ReferenceEntry<K, V> {
  /** Returns the value reference from this entry. */

     * [proxyAuthenticator] to set the authenticator for proxy servers.
     *
     * If unset, the [no authentication will be attempted][Authenticator.NONE].
     */
    fun authenticator(authenticator: Authenticator) =
      apply {
        this.authenticator = authenticator
      }

    /** Configure this client to follow redirects. If unset, redirects will be followed. */
    fun followRedirects(followRedirects: Boolean) =

그리고 많은 팀이 부분 업데이트에도 `PUT`만 사용합니다.

여러분은 원하는 방식으로 **자유롭게** 사용할 수 있으며, **FastAPI**는 어떤 제한도 강제하지 않습니다.

다만 이 가이드는 의도된 사용 방식이 대략 어떻게 되는지를 보여줍니다.

///

### Pydantic의 `exclude_unset` 파라미터 사용하기 { #using-pydantics-exclude-unset-parameter }

부분 업데이트를 받으려면 Pydantic 모델의 `.model_dump()`에서 `exclude_unset` 파라미터를 사용하는 것이 매우 유용합니다.

예: `item.model_dump(exclude_unset=True)`.

이는 `item` 모델을 만들 때 실제로 설정된 데이터만 포함하는 `dict`를 생성하고, 기본값은 제외합니다.

But this guide shows you, more or less, how they are intended to be used.

///

### Using Pydantic's `exclude_unset` parameter { #using-pydantics-exclude-unset-parameter }

If you want to receive partial updates, it's very useful to use the parameter `exclude_unset` in Pydantic's model's `.model_dump()`.

Like `item.model_dump(exclude_unset=True)`.

/// note | 注意

`PATCH` 相較於 `PUT` 較少被使用、也較不為人知。

許多團隊甚至在部分更新時也只用 `PUT`。

你可以依需求自由選用，**FastAPI** 不會強制規範。

但本指南會大致示範它們各自的設計用法。

///

### 使用 Pydantic 的 `exclude_unset` 參數 { #using-pydantics-exclude-unset-parameter }

如果要接收部分更新，在 Pydantic 模型的 `.model_dump()` 中使用 `exclude_unset` 參數非常實用。

例如 `item.model_dump(exclude_unset=True)`。

這會產生一個只包含建立 `item` 模型時實際設定過之欄位的 `dict`，不含預設值。