# JSON 相容編碼器 { #json-compatible-encoder }

在某些情況下，你可能需要將某種資料型別（例如 Pydantic 模型）轉換為與 JSON 相容的類型（例如 `dict`、`list` 等）。

例如，當你需要把它儲存在資料庫中。

為此，**FastAPI** 提供了 `jsonable_encoder()` 函式。

## 使用 `jsonable_encoder` { #using-the-jsonable-encoder }

想像你有一個只接受與 JSON 相容資料的資料庫 `fake_db`。

例如，它不接受 `datetime` 物件，因為那與 JSON 不相容。

因此，必須將 `datetime` 物件轉為一個以 [ISO 格式](https://en.wikipedia.org/wiki/ISO_8601) 表示資料的 `str`。

        )
        require(lineFound) {
            "File '$docFile' does not contain the expected compatibility line: '$linePrefix'"
        }
    }

    protected
    fun fetchVersionsFromMavenMetadata(url: String): List<String> =
        DocumentBuilderFactory.newInstance().apply {
            setFeature("http://apache.org/xml/features/disallow-doctype-decl", true)
            setFeature("http://xml.org/sax/features/external-general-entities", false)

            }
        } finally {
            lock.writeLock().unlock();
        }
    }

    /**
     * Get all children
     *
     * @return list of child file info
     */
    public List<FileInfo> getChildren() {
        lock.readLock().lock();
        try {
            lastAccessTime = System.currentTimeMillis();
            return new ArrayList<>(children.values());

import static java.util.Arrays.asList;

import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import junit.framework.Test;

/**
 * Tests the {@link Map} implementations of {@link java.util}, suppressing tests that trip known
 * bugs in OpenJDK 6 or higher.
 *

	if reducedErr != nil {
		return FileInfo{}, reducedErr
	}

	// List all the file commit ids from parts metadata.
	modTimes := listObjectModtimes(partsMetadata, errs)

	// Count all latest updated FileInfo values
	var count int
	var latestFileInfo FileInfo

	// Reduce list of UUIDs to a single common value - i.e. the last updated Time
	modTime := commonTime(modTimes, expectedRQuorum)

package org.codelibs.fess.app.web.api.admin.searchlist;

import org.codelibs.fess.app.web.admin.searchlist.ListForm;
import org.lastaflute.web.validation.theme.conversion.ValidateTypeFailure;

/**
 * Search request body for search list administration API.
 */
public class SearchBody extends ListForm {

    /**
     * Default constructor.
     */
    public SearchBody() {
        super();
    }

    // `size` is an alias of `num`.

  val proxies: MutableList<Proxy> = mutableListOf()

  fun addProxy(proxy: Proxy): FakeProxySelector {
    proxies.add(proxy)
    return this
  }

  override fun select(uri: URI): List<Proxy> {
    // Don't handle 'socket' schemes, which the RI's Socket class may request (for SOCKS).
    return if (uri.scheme == "http" || uri.scheme == "https") proxies else listOf(Proxy.NO_PROXY)
  }

        }
    }

    /**
     * LSA referenced domain list.
     */
    public static class LsarRefDomainList extends NdrObject {

        /**
         * Default constructor for LsarRefDomainList.
         */
        public LsarRefDomainList() {
            // Default constructor
        }

        /** Number of domains in the list. */
        public int count;

      <url>http://www.apache.org/licenses/LICENSE-2.0.txt</url>
      <distribution>repo</distribution>
    </license>
  </licenses>

  <developers>
    <!-- Sonatype requires that we list someone here. Guava has many contributors: https://github.com/google/guava/graphs/contributors -->
    <developer>
      <id>cpovirk</id>
      <name>Chris Povirk</name>
      <email>******@****.***</email>
    </developer>

        assertEquals(42, groovyEngine.evaluate(script, params));
    }

    /**
     * Test that list operations work
     */
    @Test
    public void test_evaluate_listOperations() {
        final Map<String, Object> params = new HashMap<>();
        final String script = "def list = [1, 2, 3, 4, 5]; return list.sum()";
        assertEquals(15, groovyEngine.evaluate(script, params));
    }

    /**