@Named
public interface ModelTransformer extends SpiService {

    /**
     * Apply a transformation on the file model.
     *
     * This method will be called on each file model being loaded,
     * just before validation.
     *
     * @param model the input model
     * @return the transformed model, or the input model if no transformation is needed
     * @throws ModelTransformerException
     */
    @Nonnull

import org.apache.maven.settings.io.DefaultSettingsWriter;
import org.apache.maven.settings.io.SettingsReader;
import org.apache.maven.settings.io.SettingsWriter;
import org.apache.maven.settings.validation.DefaultSettingsValidator;
import org.apache.maven.settings.validation.SettingsValidator;

/**
 * A factory to create settings builder instances when no dependency injection is available. Note: This class

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.app.web.admin.design;

import org.lastaflute.web.ruts.multipart.MultipartFormFile;
import org.lastaflute.web.validation.Required;

import jakarta.validation.constraints.Pattern;

public class UploadForm {

    @Required
    public MultipartFormFile designFile;

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.app.web.admin.dict.kuromoji;

import org.lastaflute.web.validation.Required;
import org.lastaflute.web.validation.theme.conversion.ValidateTypeFailure;

public class EditForm extends CreateForm {

    @Required
    @ValidateTypeFailure
    public Long id;

    public String getDisplayId() {

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.app.web.admin.dict.stemmeroverride;

import org.lastaflute.web.validation.Required;
import org.lastaflute.web.validation.theme.conversion.ValidateTypeFailure;

/**
 * @author shinsuke
 * @author Keiichi Watanabe
 */
public class EditForm extends CreateForm {

    @Required
    @ValidateTypeFailure

/// check

So, with the same Python type declaration, **FastAPI** gives you data validation.

Notice that the error also clearly states exactly the point where the validation didn't pass.

This is incredibly helpful while developing and debugging code that interacts with your API.

///

## Documentation

                            "content": {"application/json": {"schema": {}}},
                        },
                        "422": {
                            "description": "Validation Error",
                            "content": {
                                "application/json": {
                                    "schema": {

        field_mapping: Dict[
            Tuple[ModelField, Literal["validation", "serialization"]], JsonSchemaValue
        ],
        separate_input_output_schemas: bool = True,
    ) -> Dict[str, Any]:
        override_mode: Union[Literal["validation"], None] = (
            None if separate_input_output_schemas else "validation"
        )

                            "content": {"application/json": {"schema": {}}},
                        },
                        "422": {
                            "description": "Validation Error",
                            "content": {
                                "application/json": {
                                    "schema": {

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.app.web.admin.searchlist;

import org.lastaflute.web.validation.Required;

import jakarta.validation.constraints.Size;

public class DeleteForm {

    @Size(max = 1000)
    public String q;

    @Required
    public String docId;