# Body - Campos { #body-fields }

De la misma manera que puedes declarar validaciones adicionales y metadatos en los parámetros de las *path operation function* con `Query`, `Path` y `Body`, puedes declarar validaciones y metadatos dentro de los modelos de Pydantic usando `Field` de Pydantic.

## Importar `Field` { #import-field }

Primero, tienes que importarlo:

{* ../../docs_src/body_fields/tutorial001_an_py310.py hl[4] *}

/// warning | Advertencia

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import com.google.common.base.Function;
import com.google.common.collect.testing.AnEnum;
import com.google.common.collect.testing.MapTestSuiteBuilder;
import com.google.common.collect.testing.TestEnumMapGenerator;

                final java.util.function.Function<org.lastaflute.job.subsidiary.SnapshotExecState, RESULT> oneArgLambda) {
            return OptionalThing.empty();
        }

        @Override
        public org.dbflute.optional.OptionalThingIfPresentAfter ifExecutingNow(
                final java.util.function.Consumer<org.lastaflute.job.subsidiary.SnapshotExecState> oneArgLambda) {

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect;

import com.google.common.base.Function;
import com.google.common.collect.testing.ListTestSuiteBuilder;
import com.google.common.collect.testing.TestStringListGenerator;
import com.google.common.collect.testing.features.CollectionFeature;

 * limitations under the License.
 */

package com.google.common.collect;

import static java.util.Arrays.asList;

import com.google.common.base.Function;
import com.google.common.collect.Multiset.Entry;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect;

import com.google.common.base.Function;
import com.google.common.collect.testing.ListTestSuiteBuilder;
import com.google.common.collect.testing.TestStringListGenerator;
import com.google.common.collect.testing.features.CollectionFeature;

    }

    @Override
    public Iterable<Entry<String, String>> order(List<Entry<String, String>> insertionOrder) {
      return insertionOrder;
    }

    static final Function<String, String> FUNCTION =
        new Function<String, String>() {
          @Override
          public String apply(String value) {
            return Ascii.toLowerCase(value);
          }
        };

    }

    @Override
    public Iterable<Entry<String, String>> order(List<Entry<String, String>> insertionOrder) {
      return insertionOrder;
    }

    static final Function<String, String> FUNCTION =
        new Function<String, String>() {
          @Override
          public String apply(String value) {
            return Ascii.toLowerCase(value);
          }
        };

// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package lock

import (
	"os"
	"syscall"
)

// Internal function implements support for both
// blocking and non blocking lock type.
func lockedOpenFile(path string, flag int, perm os.FileMode, lockType int) (*LockedFile, error) {
	switch flag {
	case syscall.O_RDONLY:

(function($,window){"use strict";$(window).bind("validatorsLoaded",function(){$.formUtils.LANG={errorTitle : 'フォームの送信に失敗しました！',requiredFields : '必須項目を入力してください',requiredField : '必須項目を入力してください',badTime : '正しい時間を入力してください',badEmail : '正しいメールアドレスを入力してください',badTelephone : '正しい電話番号を入力してください',badSecurityAnswer : 'セキュリティの質問に正しい回答を入力してください',badDate : '正しい日付を入力してください',lengthBadStart : '入力値は ',lengthBadEnd : ' 文字で入力してください',lengthTooLongStart : '入力値は最大 ',lengthTooShortStart : '入力値は最小 ',notConfirmed : '入力値...