```

////

//// tab | Python 3.8+

```Python hl_lines="15-23"
{!> ../../docs_src/schema_extra_example/tutorial001.py!}
```

////

这些额外的信息将按原样添加到输出的JSON模式中。

## `Field` 的附加参数

在 `Field`, `Path`, `Query`, `Body` 和其他你之后将会看到的工厂函数，你可以为JSON 模式声明额外信息，你也可以通过给工厂函数传递其他的任意参数来给JSON 模式声明额外信息，比如增加 `example`:

//// tab | Python 3.10+

```Python hl_lines="2  8-11"

from fastapi import Depends, FastAPI, HTTPException, Query
from sqlmodel import Field, Session, SQLModel, create_engine, select
from typing_extensions import Annotated


class Hero(SQLModel, table=True):
    id: Union[int, None] = Field(default=None, primary_key=True)
    name: str = Field(index=True)
    age: Union[int, None] = Field(default=None, index=True)
    secret_name: str


sqlite_file_name = "database.db"

func (z *xlMetaDataDirDecoder) DecodeMsg(dc *msgp.Reader) (err error) {
	var field []byte
	_ = field
	var zb0001 uint32
	zb0001, err = dc.ReadMapHeader()
	if err != nil {
		err = msgp.WrapError(err)
		return
	}
	var zb0001Mask uint8 /* 1 bits */
	_ = zb0001Mask
	for zb0001 > 0 {
		zb0001--
		field, err = dc.ReadMapKeyPtr()
		if err != nil {
			err = msgp.WrapError(err)
			return
		}

  // inlineVolumeSpec contains all the information necessary to attach
  // a persistent volume defined by a pod's inline VolumeSource. This field
  // is populated only for the CSIMigration feature. It contains
  // translated fields from a pod's inline VolumeSource to a
  // PersistentVolumeSpec. This field is alpha-level and is only
  // honored by servers that enabled the CSIMigration feature.
  // +optional

  // This field is set via the /status subresource. Once populated, this field is immutable.
  //
  // If the certificate signing request is denied, a condition of type "Denied" is added and this field remains empty.
  // If the signer cannot issue the certificate, a condition of type "Failed" is added and this field remains empty.
  //
  // Validation requirements:

from typing import Union

from fastapi import Depends, FastAPI, HTTPException, Query
from sqlmodel import Field, Session, SQLModel, create_engine, select


class Hero(SQLModel, table=True):
    id: Union[int, None] = Field(default=None, primary_key=True)
    name: str = Field(index=True)
    age: Union[int, None] = Field(default=None, index=True)
    secret_name: str


sqlite_file_name = "database.db"

        final Object fieldsObj = existingSource.get(FieldNames.FIELDS);
        if (fieldsObj instanceof List) {
            @SuppressWarnings("unchecked")
            final List<String> existingValues = (List<String>) fieldsObj;
            concatValues(existingValues, fields);
            map.put(FieldNames.FIELDS, existingValues);
        } else {
            map.put(FieldNames.FIELDS, fields);
        }

        } else {
            queryBuilder.must(QueryBuilders.termQuery(FieldNames.ROLES, SuggestConstants.DEFAULT_ROLE));
        }
        if (!fields.isEmpty()) {
            queryBuilder.must(QueryBuilders.termsQuery(FieldNames.FIELDS, fields));
        }
        if (!languages.isEmpty()) {
            queryBuilder.must(QueryBuilders.termsQuery(FieldNames.LANGUAGES, languages));
        }

// 	     runtime.TypeMeta    `json:",inline"`
// 	     ... // other fields
// 	}
//
// func (obj *MyAwesomeAPIObject) SetGroupVersionKind(gvk *metav1.GroupVersionKind) { metav1.UpdateTypeMeta(obj,gvk) }; GroupVersionKind() *GroupVersionKind
//
// TypeMeta is provided here for convenience. You may use it directly from this package or define
// your own with the same fields.
//
// +k8s:deepcopy-gen=false
// +protobuf=true

            {
                "type": "value_error.missing",
                "loc": ["body", "username"],
                "msg": "field required",
            },
            {
                "type": "value_error.missing",
                "loc": ["body", "password"],
                "msg": "field required",
            },
        ]
    }


# TODO: remove when deprecating Pydantic v1
@needs_pydanticv1