"name": "Foo",
    "description": "An optional description",
    "price": 45.2,
    "tax": 3.5
}
```

...as `description` and `tax` are optional (with a default value of `None`), this JSON "`object`" would also be valid:

```JSON
{
    "name": "Foo",
    "price": 45.2
}
```

## Declare it as a parameter { #declare-it-as-a-parameter }

	t.Run("Account", func(t *testing.T) {
		AssertObjEqual(t, user.Account, expect.Account, "ID", "CreatedAt", "UpdatedAt", "DeletedAt", "UserID", "Number")

		if user.Account.Number != "" {
			if !user.Account.UserID.Valid {
				t.Errorf("Account's foreign key should be saved")
			} else {
				var account Account
				db(unscoped).First(&account, "user_id = ?", user.ID)

```

</div>

Então, vá para a interface `/docs`, você verá que o **FastAPI** está usando esses **modelos** para **documentar** a API, e ele também os usará para **serializar** e **validar** os dados.

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

## Atualizar o App com Múltiplos Modelos { #update-the-app-with-multiple-models }

        byte[] dst = new byte[100];

        int result = querySecurityDesc.writeSetupWireFormat(dst, 10);

        assertEquals(0, result);
    }

    @Test
    @DisplayName("Test writeParametersWireFormat with valid FID and security information")
    void testWriteParametersWireFormat() {
        int fid = 0xABCD;
        int securityInfo = DACL_SECURITY_INFORMATION | OWNER_SECURITY_INFORMATION;

            assertNotNull(result);
            assertSame(response1, result);
            assertSame(response2, result.getNext());
        }

        @Test
        @DisplayName("setResponse should accept valid response")
        void testSetResponse() {
            TestServerMessageBlock2Response response = new TestServerMessageBlock2Response(mockConfig);

            testRequest.setResponse(response);

    /**
     * Parses a robots.txt file from the given input stream using the specified character encoding.
     *
     * <p>This method is designed to be resilient to malformed robots.txt files.
     * It will parse valid directives and ignore invalid ones, ensuring that partial
     * content can be extracted even from poorly formatted files.</p>
     *
     * <p>The following errors are handled gracefully (line is skipped, parsing continues):</p>

        when(dataHelper.getAccessResultMap(sessionId)).thenReturn(accessResultMap);

        // Execute
        service.offerAll(sessionId, newUrlList);

        // Verify - only valid URL should be added
        assertEquals(1, existingQueue.size());
    }

    public void test_visited() {
        // Setup
        String sessionId = "session123";

```JSON
{
  "detail": [
    {
      "type": "int_parsing",
      "loc": [
        "path",
        "item_id"
      ],
      "msg": "Input should be a valid integer, unable to parse string as an integer",
      "input": "foo"
    }
  ]
}
```

из-за того, что параметр пути `item_id` имеет значение `"foo"`, которое не является типом `int`.

	fields := strings.Split(releaseTag, ".")
	if len(fields) < 2 || len(fields) > 4 {
		return releaseTime, fmt.Errorf("%s is not a valid release tag", releaseTag)
	}
	if fields[0] != "RELEASE" {
		return releaseTime, fmt.Errorf("%s is not a valid release tag", releaseTag)
	}
	return time.Parse(MinioReleaseTagTimeLayout, fields[1])
}

// getModTime - get the file modification time of `path`

    private static final int RESERVED_BYTES = 4;

    @Nested
    @DisplayName("Constructor Tests")
    class ConstructorTests {

        @Test
        @DisplayName("Should create instance with valid parameters")
        void testConstructorWithValidParameters() {
            // Given
            long sourceOffset = 1024L;
            long targetOffset = 2048L;
            int length = 4096;

            // When