scopes := db.Statement.scopes
	db.Statement.scopes = nil
	for _, scope := range scopes {
		db = scope(db)
	}
	return db
}

// Preload preload associations with given conditions
//
//	// get all users, and preload all non-cancelled orders
//	db.Preload("Orders", "state NOT IN (?)", "cancelled").Find(&users)
func (db *DB) Preload(query string, args ...interface{}) (tx *DB) {
	tx = db.getInstance()

        String scopeId = dependency.getScope();
        DependencyScope scope;
        if (scopeId == null || scopeId.isEmpty()) {
            scope = DependencyScope.COMPILE;
        } else {
            scope = DependencyScope.forId(scopeId);
        }
        return scope == null || !scope.isTransitive();
    }

    private Dependency merge(Dependency dep1, Dependency dep2) {

    )
    own_oauth_scopes: list[str] = []
    if isinstance(depends, params.Security) and depends.scopes:
        own_oauth_scopes.extend(depends.scopes)
    return get_dependant(
        path=path,
        call=depends.dependency,
        scope=depends.scope,
        own_oauth_scopes=own_oauth_scopes,
    )


def get_flat_dependant(
    dependant: Dependant,
    *,

    return {"token": credentials, "scopes": security_scopes.scopes}


@app.get("/get-credentials")
def get_credentials(
    credentials: Annotated[dict, Security(process_auth, scopes=["a", "b"])],
):
    return credentials


@app.get(
    "/parameterless-with-scopes",
    dependencies=[Security(process_auth, scopes=["a", "b"])],
)
def get_parameterless_with_scopes():
    return {"status": "ok"}


@app.get(

	DB.Create(&users)

	var users1, users2, users3 []User
	DB.Scopes(NameIn1And2).Find(&users1)
	if len(users1) != 2 {
		t.Errorf("Should found two users's name in 1, 2, but got %v", len(users1))
	}

	DB.Scopes(NameIn1And2, NameIn2And3).Find(&users2)
	if len(users2) != 1 {
		t.Errorf("Should found one user's name is 2, but got %v", len(users2))
	}

	DB.Scopes(NameIn([]string{users[0].Name, users[2].Name})).Find(&users3)

     * @param scopesToCollect The dependency scopes that should be collected, may be {@code null}.
     * @param scopesToResolve The dependency scopes that should be collected and also resolved, may be {@code null}.
     * @param session         The current build session, must not be {@code null}.
     * @return The transitive dependencies of the specified project that match the requested scopes, never {@code null}.

                            "title": "Password",
                            "type": "string",
                            "format": "password",
                        },
                        "scope": {"title": "Scope", "type": "string", "default": ""},
                        "client_id": {
                            "title": "Client Id",
                            "anyOf": [{"type": "string"}, {"type": "null"}],

import org.eclipse.aether.impl.scope.InternalScopeManager;
import org.eclipse.aether.internal.impl.scope.ManagedDependencyContextRefiner;
import org.eclipse.aether.internal.impl.scope.ManagedScopeDeriver;
import org.eclipse.aether.internal.impl.scope.ManagedScopeSelector;
import org.eclipse.aether.internal.impl.scope.OptionalDependencySelector;
import org.eclipse.aether.internal.impl.scope.ScopeDependencySelector;

    return mod


def get_access_token(
    *, username="johndoe", password="secret", scope=None, client: TestClient
):
    data = {"username": username, "password": password}
    if scope:
        data["scope"] = scope
    response = client.post("/token", data=data)
    content = response.json()
    access_token = content.get("access_token")
    return access_token

但由于这种用例很常见，FastAPI 为了简便，就直接提供了对它的支持。

///

### 使用表单数据

/// tip | 提示

`OAuth2PasswordRequestForm` 类依赖项的实例没有以空格分隔的长字符串属性 `scope`，但它支持 `scopes` 属性，由已发送的 scope 字符串列表组成。

本例没有使用 `scopes`，但开发者也可以根据需要使用该属性。

///

现在，即可使用表单字段 `username`，从（伪）数据库中获取用户数据。

如果不存在指定用户，则返回错误消息，提示**用户名或密码错误**。

本例使用 `HTTPException` 异常显示此错误：