# Separate OpenAPI Schemas for Input and Output or Not { #separate-openapi-schemas-for-input-and-output-or-not }

Since **Pydantic v2** was released, the generated OpenAPI is a bit more exact and **correct** than before. 😎

In fact, in some cases, it will even have **two JSON Schemas** in OpenAPI for the same Pydantic model, for input and output, depending on if they have **default values**.

Let's see how that works and how to change it if you need to do that.

		ContentLength: int64(len("<>")),
	}

	// Not an XML
	badRequest := &http.Request{
		Body:          io.NopCloser(bytes.NewReader([]byte("garbage"))),
		ContentLength: int64(len("garbage")),
	}

	// generates the input request with XML bucket configuration set to the request body.
	createExpectedRequest := func(req *http.Request, location string) *http.Request {
		createBucketConfig := createBucketLocationConfiguration{}

    "jinja2 >=3.1.5",
    # For forms and file uploads
    "python-multipart >=0.0.18",
    # For Starlette's SessionMiddleware, not commonly used with FastAPI
    "itsdangerous >=1.1.0",
    # For Starlette's schema generation, would not be used with FastAPI
    "pyyaml >=5.3.1",
    # For UJSONResponse
    "ujson >=4.0.1,!=4.0.2,!=4.1.0,!=4.2.0,!=4.3.0,!=5.0.0,!=5.1.0",
    # For ORJSONResponse
    "orjson >=3.2.1",

        assert response.json() == snapshot(
            {"age": 30, "id": IsInt(), "name": "Dead Pond"}
        )
        assert response.json()["id"] != 9000, (
            "The ID should be generated by the database"
        )

        # Read a hero
        hero_id = response.json()["id"]
        response = client.get(f"/heroes/{hero_id}")
        assert response.status_code == 200, response.text

// Code generated by github.com/tinylib/msgp DO NOT EDIT.

package cmd

import (
	"bytes"
	"testing"

	"github.com/tinylib/msgp/msgp"
)

func TestMarshalUnmarshalAccElem(t *testing.T) {
	v := AccElem{}
	bts, err := v.MarshalMsg(nil)
	if err != nil {
		t.Fatal(err)
	}
	left, err := v.UnmarshalMsg(bts)
	if err != nil {
		t.Fatal(err)
	}
	if len(left) > 0 {

// Code generated by github.com/tinylib/msgp DO NOT EDIT.

package cmd

import (
	"bytes"
	"testing"

	"github.com/tinylib/msgp/msgp"
)

func TestMarshalUnmarshalBatchJobExpire(t *testing.T) {
	v := BatchJobExpire{}
	bts, err := v.MarshalMsg(nil)
	if err != nil {
		t.Fatal(err)
	}
	left, err := v.UnmarshalMsg(bts)
	if err != nil {
		t.Fatal(err)
	}
	if len(left) > 0 {

// Code generated by github.com/tinylib/msgp DO NOT EDIT.

package cmd

import (
	"github.com/tinylib/msgp/msgp"
)

// DecodeMsg implements msgp.Decodable
func (z *SiteResyncStatus) 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
	}
	for zb0001 > 0 {
		zb0001--
		field, err = dc.ReadMapKeyPtr()

			Description: "policies to apply for plugin authorized users" + defaultHelpPostfix(RolePolicy),
			Type:        "string",
		},
		config.HelpKV{
			Key:         RoleID,
			Description: "unique ID to generate the ARN" + defaultHelpPostfix(RoleID),
			Optional:    true,
			Type:        "string",
		},
		config.HelpKV{
			Key:         config.Comment,
			Description: config.DefaultComment,
			Optional:    true,

		if strings.HasPrefix(stack, "testing.RunTests") {
			continue
		}
		// Ignore the following go routines.
		// testing and run time go routines should be ignored, only the application generated go routines should be taken into account.
		if isIgnoredStackFn(stack) {
			continue
		}
		gs = append(gs, g)
	}
	sort.Strings(gs)
	return gs

// Code generated by github.com/tinylib/msgp DO NOT EDIT.

package cmd

import (
	"testing"

	"github.com/tinylib/msgp/msgp"
)

func TestMarshalUnmarshalMetricDescription(t *testing.T) {
	v := MetricDescription{}
	bts, err := v.MarshalMsg(nil)
	if err != nil {
		t.Fatal(err)
	}
	left, err := v.UnmarshalMsg(bts)
	if err != nil {
		t.Fatal(err)
	}
	if len(left) > 0 {