t.Fatalf("OpUpdate has-one failed: %v", err)
	}
	var u1 User
	if err := DB.Preload("NamedPet").First(&u1, user.ID).Error; err != nil {
		t.Fatalf("load: %v", err)
	}
	if u1.NamedPet == nil || u1.NamedPet.Name != "np-after" {
		t.Fatalf("expected name updated, got %+v", u1.NamedPet)
	}

	del := clause.Association{Association: "NamedPet", Type: clause.OpDelete}

@user_router.get("/")
def get_users():
    return [{"user_id": "u1"}, {"user_id": "u2"}]


@user_router.get("/{user_id}")
def get_user(user_id: str):
    return {"user_id": user_id}


@item_router.get("/")
def get_items(user_id: Optional[str] = None):
    if user_id is None:
        return [{"item_id": "i1", "user_id": "u1"}, {"item_id": "i2", "user_id": "u2"}]
    else:

)

func TestCreate(t *testing.T) {
	u1 := *GetUser("create", Config{})

	if results := DB.Create(&u1); results.Error != nil {
		t.Fatalf("errors happened when create: %v", results.Error)
	} else if results.RowsAffected != 1 {
		t.Fatalf("rows affected expects: %v, got %v", 1, results.RowsAffected)
	}

	if u1.ID == 0 {
		t.Errorf("user's primary key should has value after create, got : %v", u1.ID)
	}

	if u1.CreatedAt.IsZero() {

    limiter.acquire(3); // R0.00, from capacity
    limiter.acquire(1); // R0.00, concluding a burst of 5 permits

    limiter.acquire(); // R0.20, capacity exhausted
    assertEvents(
        "U1.00", "U1.00", "R0.00", "R0.00", "R0.00", "R0.00", // first request and burst
        "R0.20");
  }

  public void testCreateWarmupParameterValidation() {
    RateLimiter unused;

    limiter.acquire(3); // R0.00, from capacity
    limiter.acquire(1); // R0.00, concluding a burst of 5 permits

    limiter.acquire(); // R0.20, capacity exhausted
    assertEvents(
        "U1.00", "U1.00", "R0.00", "R0.00", "R0.00", "R0.00", // first request and burst
        "R0.20");
  }

  public void testCreateWarmupParameterValidation() {
    RateLimiter unused;

	sg := sync.WaitGroup{}
	for i := 0; i < 5; i++ {
		sg.Add(1)

		go func() {
			if u1, err := reusedb.Where("id = ?", users[0].ID).First(ctx); err != nil {
				t.Errorf("failed to find user, got error: %v", err)
			} else if u1.Name != users[0].Name || u1.ID != users[0].ID {
				t.Errorf("found invalid user, got %v, expect %v", u1, users[0])
			}

			if u2, err := reusedb.Where("id = ?", users[1].ID).First(ctx); err != nil {