```

</div>

Then go to the `/docs` UI, you will see that **FastAPI** is using these **models** to **document** the API, and it will use them to **serialize** and **validate** the data too.

<div class="screenshot">
<img src="/img/tutorial/sql-databases/image01.png">
</div>

## Update the App with Multiple Models { #update-the-app-with-multiple-models }

import com.google.common.cache.LocalCache.Strength;
import com.google.common.testing.EqualsTester;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;

/**
 * Tests CacheBuilderSpec. TODO(user): tests of a few invalid input conditions, boundary
 * conditions.
 *
 * @author Adam Winer
 */
@NullUnmarked
public class CacheBuilderSpecTest extends TestCase {
  public void testParse_empty() {

          <defaultValue>true</defaultValue>
          <type>boolean</type>
          <description>Whether to send notifications on warning.</description>
        </field>
        <!-- TODO: Remove it after continuum alpha-3 release -->
        <field>
          <name>address</name>
          <version>4.0.0+</version>
          <type>String</type>
          <description>

     * @param document the parsed HTML document
     * @return the thumbnail URL if found, null otherwise
     */
    protected String getThumbnailUrl(final ResponseData responseData, final Document document) {
        // TODO PageMap
        try {
            // meta thumbnail
            final Node thumbnailNode = getXPathAPI().selectSingleNode(document, META_NAME_THUMBNAIL_CONTENT);
            if (thumbnailNode != null) {

   *     address has a scope ID that fails validation against the interfaces on the machine (as
   *     required by Java's {@link InetAddress})
   */
  @CanIgnoreReturnValue // TODO(b/219820829): consider removing
  public static InetAddress forString(String ipString) {
    Scope scope = new Scope();
    byte[] addr = ipStringToBytes(ipString, scope);

   * enforce any particular rules with regards to line folding as stated in the class docs.
   */
  private static final CharMatcher LINEAR_WHITE_SPACE = CharMatcher.anyOf(" \t\r\n");

  // TODO(gak): make these public?
  private static final String APPLICATION_TYPE = "application";
  private static final String AUDIO_TYPE = "audio";
  private static final String IMAGE_TYPE = "image";

        if (elevateWordPager.id != null) {
            cb.query().docMeta().setId_Equal(elevateWordPager.id);
        }
        // TODO Long, Integer, String supported only.

        // setup condition
        cb.query().addOrderBy_SuggestWord_Asc();

        // search

    }

    /**
     * Imports elevate words from a CSV file.

     * @param hook The error hook.
     */
    private static void validateProtwordsString(final FessBaseAction action, final String values, final String propertyName,
            final VaErrorHook hook) {
        // TODO validation
    }

    // ===================================================================================
    //                                                                              JSP

        partialExplicitTypeBoundIsNotSubtypeOfDifferentTypeBound(
            UseSerializableIterable<? extends Serializable> obj) {
      return notSubtype(obj);
    }
  }

  // TODO(benyu): migrate all subtyping tests from TypeTokenTest to this class using SubtypeTester.

  private interface Outdoor {}

  private interface Indoor {}

  private interface Grocery {}

   * changes to it will <i>not</i> be reflected in this {@code HashCode} object or any other arrays
   * returned by this method.
   */
  // TODO(user): consider ByteString here, when that is available
  public abstract byte[] asBytes();

  /**
   * Copies bytes from this hash code into {@code dest}.
   *