在 Slim Framework 中管理跨多个路由共享的数据的最佳方法是什么？

Question

假设您有 3 个页面、3 个路由 ( /index、/about、/contact) 和一个显示从数据库检索的项目列表的共享标头。Slim 中是否有更好的方法来检索所有页面/路由的这些项目，并将其传递给相应的模板，而不是本质上为每个路由控制器方法复制代码？例如，除此之外还有其他方法吗？$app->get('/', function ($request, $response, $args) {    return $this->view->render($response, 'index.twig', [        'items' => /* retrieve items from database */    ]);});$app->get('/about', function ($request, $response, $args) {    return $this->view->render($response, 'about.twig', [        'items' => /* retrieve items from database (duplicate code) */    ]);});$app->get('/contact', function ($request, $response, $args) {    return $this->view->render($response, 'contact.twig', [        'items' => /* retrieve items from database (duplicate code) */    ]);});

Answer 1

共享相同数据的路由也可以使用相同的响应程序来呈现内容。

伪示例：

<?php

namespace App\Responder;

use Psr\Http\Message\ResponseInterface;

use Slim\Views\Twig;

final class Responder

{

    private $twig;

    public function __construct(Twig $twig)

    {

        $this->twig = $twig;

    }

    public function render(ResponseInterface $response, string $template, array $data = []): ResponseInterface

    {

        $shared = ['item1', 'item2'];

        $data = array_replace(shared, $data);

        return $this->twig->render($response, $template, $data);

    }

}

用法

$this->responder->render($response, 'index.twig', ['page' => 'content']);

或者...

use App\Responder\Responder;

// ...

$app->get('/index', function($request, $response, $args){

    return $this->get(Responder::class)->render($response, 'index.twig', ['pagecontent' => 'This is some content for /index only']);

});

$app->get('/about', function($request, $response, $args){

    return $this->get(Responder::class)->render($response, 'about.twig', ['pagecontent' => 'You can have custom content for /about']);

});

$app->get('/contact', function($request, $response, $args){

    return $this->get(Responder::class)->render($response, 'contact.twig', ['pagecontent' => '...and /contact as well']);

});

Answer 2

一种选择是将这些项目作为全局变量添加到 TwigEnvironment，以便它们在每个模板中可用。

首先，您需要将全局变量添加到Twig环境中：

// A simple items provider which helps you generate a list of items

// You can change this to something that reads the items from database, etc.

class ItemsProvider {

    public function getItems()

    {

        return ['item 1', 'item 2', 'item 3', 'item-4', ];

    }

}

// Set view in Container

$container->set('view', function($c) {

    $twig = Twig::create('<path-to-tiwg-templates'>);

    // get items from items-provider and add them as global `items` variable

    // to all twig templates

    $twig->getEnvironment()->addGlobal('items', $c->get('items-provider')->getItems());

    return $twig;

});

// set sample items, you can modifiy this 

$container->set('items-provider', function($c){

    return new ItemsProvider;

});

现在变量items可用于每个 Twig 模板，而无需将其显式传递给render方法：

布局.树枝：

These are some items available in every twig template:<br>

<ul>

{% for item in items%}

    <li>{{ item }}</li>

{% endfor %}

</ul>

<br>

And this is some page specific content:<br>

{% block content %}

    {{ pagecontent }}

{% endblock %}

所有三个模板index.twig，about.twig和contact.twig都可以扩展layout.twig：

{% extends 'layout.twig' %}

对于layout.twig中使用的相同变量，每个路由具有不同值的路由定义：

$app->get('/index', function($request, $response, $args){

    return $this->get('view')->render($response, 'index.twig', ['pagecontent' => 'This is some content for /index only']);

});

$app->get('/about', function($request, $response, $args){

    return $this->get('view')->render($response, 'about.twig', ['pagecontent' => 'You can have custom content for /about']);

});

$app->get('/contact', function($request, $response, $args){

    return $this->get('view')->render($response, 'contact.twig', ['pagecontent' => '...and /contact as well']);

});