from typing import Union

from fastapi import Depends, FastAPI
from fastapi.testclient import TestClient

app = FastAPI()


async def common_parameters(
    q: Union[str, None] = None, skip: int = 0, limit: int = 100
):
    return {"q": q, "skip": skip, "limit": limit}


@app.get("/items/")
async def read_items(commons: dict = Depends(common_parameters)):
    return {"message": "Hello Items!", "params": commons}

	if err != nil {
		t.Fatal(err)
	}
	if len(left) > 0 {
		t.Errorf("%d bytes left over after UnmarshalMsg(): %q", len(left), left)
	}

	left, err = msgp.Skip(bts)
	if err != nil {
		t.Fatal(err)
	}
	if len(left) > 0 {
		t.Errorf("%d bytes left over after Skip(): %q", len(left), left)
	}
}

func BenchmarkMarshalMsgBaseOptions(b *testing.B) {
	v := BaseOptions{}
	b.ReportAllocs()
	b.ResetTimer()

	if err != nil {
		t.Fatal(err)
	}
	if len(left) > 0 {
		t.Errorf("%d bytes left over after UnmarshalMsg(): %q", len(left), left)
	}

	left, err = msgp.Skip(bts)
	if err != nil {
		t.Fatal(err)
	}
	if len(left) > 0 {
		t.Errorf("%d bytes left over after Skip(): %q", len(left), left)
	}
}

func BenchmarkMarshalMsgBatchJobPrefix(b *testing.B) {
	v := BatchJobPrefix{}
	b.ReportAllocs()
	b.ResetTimer()

	if err != nil {
		t.Fatal(err)
	}
	if len(left) > 0 {
		t.Errorf("%d bytes left over after UnmarshalMsg(): %q", len(left), left)
	}

	left, err = msgp.Skip(bts)
	if err != nil {
		t.Fatal(err)
	}
	if len(left) > 0 {
		t.Errorf("%d bytes left over after Skip(): %q", len(left), left)
	}
}

func BenchmarkMarshalMsglocalLockMap(b *testing.B) {
	v := localLockMap{}
	b.ReportAllocs()
	b.ResetTimer()

    assertFullyRead(reader);

    // skip fully
    reader = new CharSequenceReader(charSequence);
    assertEquals(expected.length(), reader.skip(Long.MAX_VALUE));
    assertFullyRead(reader);

    // skip 5 and read the rest
    if (expected.length() > 5) {
      reader = new CharSequenceReader(charSequence);
      assertEquals(5, reader.skip(5));

      buf = new char[expected.length() - 5];

	AssertEqual(t, nil, err)
}

func TestMigrateWithDefaultValue(t *testing.T) {
	if DB.Dialector.Name() == "sqlserver" {
		// sqlserver driver treats NULL and 'NULL' the same
		t.Skip("skip sqlserver")
	}

	type NullModel struct {
		ID      uint
		Content string `gorm:"default:null"`
	}

	type NullStringModel struct {
		ID      uint

	if err != nil {
		t.Fatal(err)
	}
	if len(left) != 0 {
		t.Errorf("%d bytes left over after UnmarshalMsg(): %q", len(left), left)
	}

	left, err = msgp.Skip(bts)
	if err != nil {
		t.Fatal(err)
	}
	if len(left) > 0 {
		t.Errorf("%d bytes left over after Skip(): %q", len(left), left)
	}
	if !reflect.DeepEqual(v, v2) {
		t.Errorf("MSS: %v != %v", v, v2)
	}
}

func TestMarshalUnmarshalMSSNil(t *testing.T) {

    def __init__(self, q: Union[str, None] = None, skip: int = 0, limit: int = 100):
        self.q = q
        self.skip = skip
        self.limit = limit


@app.get("/items/")
async def read_items(commons=Depends(CommonQueryParams)):
    response = {}
    if commons.q:
        response.update({"q": commons.q})
    items = fake_items_db[commons.skip : commons.skip + commons.limit]
    response.update({"items": items})

    def __init__(self, q: str | None = None, skip: int = 0, limit: int = 100):
        self.q = q
        self.skip = skip
        self.limit = limit


@app.get("/items/")
async def read_items(commons: Annotated[Any, Depends(CommonQueryParams)]):
    response = {}
    if commons.q:
        response.update({"q": commons.q})
    items = fake_items_db[commons.skip : commons.skip + commons.limit]
    response.update({"items": items})

Im obigen Beispiel haben sie die Defaultwerte `skip=0` und `limit=10`.

Wenn Sie also zur URL:

```
http://127.0.0.1:8000/items/
```

gehen, so ist das das gleiche wie die URL:

```
http://127.0.0.1:8000/items/?skip=0&limit=10
```

Aber wenn Sie zum Beispiel zu:

```
http://127.0.0.1:8000/items/?skip=20
```

gehen, werden die Parameterwerte Ihrer Funktion sein: