自定义类中的自定义响应代码 |超薄框架 3

Question

嘿，我已经尝试 slim 好几天了，现在我可以像这样制作简单的 API

$app->get('/articles/getcategories', function (Request $request, Response $response, array $args) {
(new Category) -> getCategories($response);
});

一个问题是当我想从我的班级向我的终点发送自定义响应代码时，在这种情况下 Category 类不起作用，我能够使用此方法发送响应：

$response -> getBody() -> write(json_encode($this -> makeObject(704, 'Something went wrong!')));

但是当我查看文档时：

$newResponse = $response->withStatus(302);
$data = array('name' => 'Rob', 'age' => 40);
$newResponse = $oldResponse->withJson($data, 201);

或者像这样：

return $response->withStatus(xxx);

它不起作用，这是我的自定义类

 public function getCategories($response){

    $dbconn = (new db())->connect();
        //start db connection
    try {
        $stmt = $dbconn->prepare("SELECT category_id, category_name, category_description, category_type FROM article_category");

        $categories = $stmt->fetchAll(PDO::FETCH_ASSOC);
        $response->getBody()->write(json_encode($categories));

    } catch (PDOException $e){
        $response -> getBody() -> write(json_encode($this -> makeObject(704, 'Something went wrong!')));
    }

}

我在这里做错了什么？

Answer 1

您的makeObject-方法不会设置响应代码，它可能只会将其添加到响应对象中。

您还需要设置http状态码，然后返回响应because it is immutable

try {
    $stmt = $dbconn->prepare("SELECT category_id, category_name, category_description, category_type FROM article_category");

    $categories = $stmt->fetchAll(PDO::FETCH_ASSOC);
    $response->getBody()->write(json_encode($categories));
    return $response; // uses default 200 response code (not needed but encouraged because without the return it can lead to problems later
} catch (PDOException $e){
    $response -> getBody() -> write(json_encode($this -> makeObject(704, 'Something went wrong!')));
    return $response->withStatus(704);
}

您还需要调整将新响应对象传递给 Slim 的路由

$app->get('/articles/getcategories', function (Request $request, Response $response, array $args) {
    return (new Category)->getCategories($response);
});

注意：你可以使用控制器，那么你只需要写一行而不是上面的3行，see this answer