}
```

Again, doing just that declaration, with **FastAPI** you get:

* Editor support (completion, etc.), even for nested models
* Data conversion
* Data validation
* Automatic documentation

## Special types and validation { #special-types-and-validation }

Apart from normal singular types like `str`, `int`, `float`, etc. you can use more complex singular types that inherit from `str`.

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

import org.lastaflute.web.validation.Required;

/**
 * Form class for file access operations in the admin design interface.
 * This form handles file name validation for accessing design files.
 */
public class FileAccessForm {

    /** The name of the file to access (required) */
    @Required

*   Fixes a missing validation which causes `TensorSummaryV2` to crash ([CVE-2022-29193](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-29193))
*   Fixes a missing validation which crashes `QuantizeAndDequantizeV4Grad` ([CVE-2022-29192](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-29192))

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

import org.lastaflute.web.validation.Required;

import jakarta.validation.constraints.Size;

/**
 * The mail form for General settings.
 */
public class MailForm {

    /**
     * Default constructor.
     */
    public MailForm() {

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

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

import jakarta.validation.constraints.Size;

/**
 * Form for plugin installation through the admin web interface.
 * This class represents the form data structure for installing a plugin
 * via file upload through the admin UI.

But by default, it all **"just works"**.

### Validation { #validation }

* Validation for most (or all?) Python **data types**, including:
    * JSON objects (`dict`).
    * JSON array (`list`) defining item types.
    * String (`str`) fields, defining min and max lengths.
    * Numbers (`int`, `float`) with min and max values, etc.

* Validation for more exotic types, like:
    * URL.
    * Email.

        // Looks like the failure case also is just reflecting back the signature we sent

        // with SMB3's negotiation validation it's no longer possible to ignore this (on the validation response)
        // make sure that validation is performed in any case
        final Smb2SigningDigest dgst = getDigest();

 */
package org.codelibs.fess.app.web.admin.storage;

import java.util.HashMap;
import java.util.Map;

import org.apache.logging.log4j.core.config.plugins.validation.constraints.Required;

import jakarta.validation.constraints.Size;

/**
 * Form class for handling tag operations in storage management.
 * This form represents tag data including path, name, and associated metadata.
 */

/// tip

If you have strict type checks in your editor, mypy, etc, you can declare the function return type as `Any`.

That way you tell the editor that you are intentionally returning anything. But FastAPI will still do the data documentation, validation, filtering, etc. with the `response_model`.

///

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

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

/**
 * Form class for editing mapping dictionary entries in the admin interface.