//// tab | Python 3.8+

```Python hl_lines="9-11"
{!> ../../docs_src/body_nested_models/tutorial004.py!}
```

////

### Das Kindmodell als Typ verwenden

Und dann können wir es als Typ eines Attributes verwenden.

//// tab | Python 3.10+

```Python hl_lines="18"
{!> ../../docs_src/body_nested_models/tutorial004_py310.py!}
```

////

//// tab | Python 3.9+

```Python hl_lines="20"

  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.ListMeta metadata = 1;

  // items is the list of IPAddresses.
  repeated IPAddress items = 2;
}

// IPAddressSpec describe the attributes in an IP Address.
message IPAddressSpec {
  // ParentRef references the resource that an IPAddress is attached to.
  // An IPAddress must reference a parent object.
  // +required

        ClassDoc classDoc = classDoc('Class', content: content)
        PropertyDoc propDoc = propertyDoc('propName', id: 'propId', description: 'prop description', comment: 'prop comment', type: 'org.gradle.Type', attributes: [extraAttribute])
        _ * classDoc.classProperties >> [propDoc]
        _ * classDoc.classMethods >> []
        _ * classDoc.classBlocks >> []
        _ * classDoc.classExtensions >> []

        }
        return OptionalEntity.empty();
    }

    public static OptionalEntity<Role> getRole(final CreateForm form) {
        return getEntity(form).map(entity -> {
            copyMapToBean(form.attributes, entity, op -> op.exclude(Constants.COMMON_CONVERSION_RULE));
            copyBeanToBean(form, entity, op -> op.exclude(Constants.COMMON_CONVERSION_RULE));
            return entity;
        });
    }

### `UploadFile`

`UploadFile` has the following attributes:

* `filename`: A `str` with the original file name that was uploaded (e.g. `myimage.jpg`).
* `content_type`: A `str` with the content type (MIME type / media type) (e.g. `image/jpeg`).

  // Runtime. This is necessary to decouple runtime-dependent
  // code that is layered on top of the runtime.
  virtual bool UsesTFRT() = 0;

  // List attributes of available devices
  virtual void ListDevices(std::vector<DeviceAttributes>* devices) = 0;

  // Add `devices` into context's device manager. Context's device manager

///

## Multiple body parameters

In the previous example, the *path operations* would expect a JSON body with the attributes of an `Item`, like:

```JSON
{
    "name": "Foo",
    "description": "The pretender",
    "price": 42.0,
    "tax": 3.2
}
```

	claims[expClaim] = UTCNow().Add(expiryDur).Unix()
	claims[ldapUser] = ldapUserDN
	claims[ldapActualUser] = ldapActualUserDN
	claims[ldapUserN] = ldapUsername
	// Add lookup up LDAP attributes as claims.
	for attrib, value := range lookupResult.Attributes {
		claims[ldapAttribPrefix+attrib] = value
	}

	secret, err := getTokenSigningKey()
	if err != nil {
		writeSTSErrorResponse(ctx, w, ErrSTSInternalError, err)
		return

			writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErrWithErr(ErrAdminNoSuchUser, err), r.URL)
			return
		}

		// Add LDAP attributes that were looked up into the claims.
		for attribKey, attribValue := range lookupResult.Attributes {
			opts.claims[ldapAttribPrefix+attribKey] = attribValue
		}
	}

	newCred, updatedAt, err := globalIAMSys.NewServiceAccount(ctx, targetUser, targetGroups, opts)

We could do better.

We can declare a `UserBase` model that serves as a base for our other models. And then we can make subclasses of that model that inherit its attributes (type declarations, validation, etc).

All the data conversion, validation, documentation, etc. will still work as normally.