# Модели форм { #form-models }

Вы можете использовать **Pydantic-модели** для объявления **полей формы** в FastAPI.

/// info | Дополнительная информация

Чтобы использовать формы, сначала установите <a href="https://github.com/Kludex/python-multipart" class="external-link" target="_blank">`python-multipart`</a>.

def test_openapi_schema(client: TestClient):
    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "openapi": "3.1.0",
        "info": {"title": "FastAPI", "version": "0.1.0"},
        "paths": {
            "/items/{item_id}": {
                "get": {
                    "responses": {
                        "200": {

                        "type",
                    ],
                    "title": "ValidationError",
                    "type": "object",
                },
            },
        },
        "info": {
            "title": "FastAPI",
            "version": "0.1.0",
        },
        "openapi": "3.1.0",
        "paths": {
            "/items/": {
                "get": {

// Msgsize returns an upper bound estimate of the number of bytes occupied by the serialized message
func (z StatusType) Msgsize() (s int) {
	s = msgp.StringPrefixSize + len(string(z))
	return
}

// DecodeMsg implements msgp.Decodable
func (z *Type) DecodeMsg(dc *msgp.Reader) (err error) {
	{
		var zb0001 int
		zb0001, err = dc.ReadInt()
		if err != nil {
			err = msgp.WrapError(err)
			return
		}
		(*z) = Type(zb0001)
	}

В таком случае вы можете отключить эту функциональность в FastAPI с помощью параметра `separate_input_output_schemas=False`.

/// info | Информация

Поддержка `separate_input_output_schemas` появилась в FastAPI `0.102.0`. 🤓

///

{* ../../docs_src/separate_openapi_schemas/tutorial002_py310.py hl[10] *}

		if i < len(r.csvRecord) {
			kvs = append(kvs, jstream.KV{Key: cn, Value: r.csvRecord[i]})
		}
	}
	return json.NewEncoder(writer).Encode(kvs)
}

// Raw - returns the underlying data with format info.
func (r *Record) Raw() (sql.SelectObjectFormat, any) {
	return sql.SelectFmtCSV, r
}

// Replace - is not supported for CSV
func (r *Record) Replace(_ any) error {

# Modelos de Formulario { #form-models }

Puedes usar **modelos de Pydantic** para declarar **campos de formulario** en FastAPI.

/// info | Información

Para usar formularios, primero instala <a href="https://github.com/Kludex/python-multipart" class="external-link" target="_blank">`python-multipart`</a>.

Asegúrate de crear un [entorno virtual](../virtual-environments.md){.internal-link target=_blank}, activarlo, y luego instalarlo, por ejemplo:

```console

def test_openapi_schema(client: TestClient):
    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "openapi": "3.1.0",
        "info": {"title": "FastAPI", "version": "0.1.0"},
        "paths": {
            "/items/{item_id}": {
                "put": {
                    "parameters": [
                        {

def test_openapi_schema(client: TestClient):
    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "openapi": "3.1.0",
        "info": {"title": "FastAPI", "version": "0.1.0"},
        "paths": {
            "/items/": {
                "get": {
                    "responses": {
                        "200": {

def test_openapi_schema(client: TestClient):
    response = client.get("/openapi.json")
    assert response.status_code == 200
    assert response.json() == {
        "openapi": "3.1.0",
        "info": {"title": "FastAPI", "version": "0.1.0"},
        "paths": {
            "/items/{id}": {
                "put": {
                    "operationId": "update_item_items__id__put",
                    "parameters": [