# JSON互換エンコーダ

データ型（Pydanticモデルのような）をJSONと互換性のあるもの（`dict`や`list`など）に変更する必要がある場合があります。

例えば、データベースに保存する必要がある場合です。

そのために、**FastAPI** は`jsonable_encoder()`関数を提供しています。

## `jsonable_encoder`の使用

JSON互換のデータのみを受信するデータベース`fase_db`があるとしましょう。

例えば、`datetime`オブジェクトはJSONと互換性がないので、このデーターベースには受け取られません。

そのため、`datetime`オブジェクトは<a href="https://en.wikipedia.org/wiki/ISO_8601" class="external-link" target="_blank">ISO形式</a>のデータを含む`str`に変換されなければなりません。

<img src="/img/tutorial/body/image04.png">

Isso não é por acaso, todo o framework foi construído em volta deste design.

E foi imensamente testado na fase de design, antes de qualquer implementação, para garantir que funcionaria para todos os editores de texto.

Houveram mudanças no próprio Pydantic para que isso fosse possível.

* `main`: il file `main.py` (il "modulo" Python).
* `app`: l'oggetto creato dentro `main.py` con la riga di codice `app = FastAPI()`.
* `--reload`: ricarica il server se vengono rilevati cambiamenti del codice. Usalo solo durante la fase di sviluppo.

</details>

### Testa l'API

Apri il browser all'indirizzo <a href="http://127.0.0.1:8000/items/5?q=somequery" class="external-link" target="_blank">http://127.0.0.1:8000/items/5?q=somequery</a>.

* los contenidos que tu programa da al sistema para ser escritos en disco
* una operación relacionada con una API remota
* una operación de base de datos
* el retorno de resultados de una consulta de base de datos
* etc.

    # o isColumnNameCamelCase: (NotRequired - Default false)
    #  Is the column name camel case?
    #  Basically you don't need this if the style of column name is like 'FOO_NAME'.
    #    [true]
    #      The column name is camel case.
    #      e.g. If the column name is 'OrderDetailId', the class name is 'OrderDetailId'.
    #
    #    [false]

package okhttp3.internal.http2.hpackjson

import okhttp3.internal.http2.Header
import okio.ByteString

/**
 * Representation of an individual case (set of headers and wire format). There are many cases for a
 * single story.  This class is used reflectively with Moshi to parse stories.
 */
data class Case(
  val seqno: Int = 0,
  val wire: ByteString? = null,
  val headers: List<Map<String, String>>,
) : Cloneable {

            // For invalid code like the following,
            // ```
            // when {
            //   true, false -> {}
            // }
            // ```
            // `false` does not have a corresponding elements on the FIR side and hence the containing `FirWhenBranch` is returned. In this
            // case, we simply report null since FIR does not know about it.
            else -> null
        }
    }

        val unsubstitutedKtSignature = targetSymbol.toKtSignature()

        handleCompoundAccessCall(psi, fir, resolveFragmentOfCall)?.let { return it }

        var firstArgIsExtensionReceiver = false
        var isImplicitInvoke = false

        // TODO: Ideally, we should get the substitutor from the candidate. But it seems there is no way to get the substitutor from the

    assertThat(forJavaName("SSL_DH_RSA_EXPORT_WITH_DES40_CBC_SHA"))
      .isEqualTo(forJavaName("TLS_DH_RSA_EXPORT_WITH_DES40_CBC_SHA"))
    assertThat(forJavaName("SSL_FAKE_NEW_CIPHER"))
      .isEqualTo(forJavaName("TLS_FAKE_NEW_CIPHER"))
  }

  @Test
  fun applyIntersectionRetainsTlsPrefixes() {
    val socket = FakeSslSocket()
    socket.enabledProtocols = arrayOf("TLSv1")

import org.jetbrains.kotlin.analysis.api.descriptors.symbols.psiBased.base.ktVisibility
import org.jetbrains.kotlin.analysis.api.descriptors.utils.cached
import org.jetbrains.kotlin.analysis.api.impl.base.annotations.KtEmptyAnnotationsList
import org.jetbrains.kotlin.analysis.api.impl.base.symbols.pointers.KtPropertySetterSymbolPointer
import org.jetbrains.kotlin.analysis.api.impl.base.symbols.pointers.KtValueParameterFromDefaultSetterSymbolPointer