扩展 Twig 以定义资产 url

Question

我阅读了 Silex Cookbook 在模板中管理资产 http://silex.sensiolabs.org/doc/cookbook/assets.html

并在我的 app/app.php 中写入此代码：

$app['twig'] = $app->share($app->extend('twig', function ($twig, $app) {
    $twig->addFunction(new \Twig_SimpleFunction('asset', function ($asset) {
        // implement whatever logic you need to determine the asset path
        return sprintf('http://assets.examples.com/%s', ltrim($asset, '/'));
    }));

    return $twig;
}));

$app->get('/', function () use ($app) {
    return $app['twig']->render('index.twig', array(
        'title' => "Hello World",
        'colors' => array("red", "green", "yellow"),
    ));
});

和index.twig包含：

{% extends "layout.twig" %}

{% block title %}
    {{ title }}
{% endblock %}

{% block content %}
    <h1>{{ title }}</h1>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Animi quibusdam numquam laudantium eum asperiores non libero odio quae debitis beatae perferendis eius esse molestiae voluptatum vel inventore quasi. Quo sint sequi sunt amet sapiente tempora autem iusto praesentium rerum ducimus.</p>

    <ul>
        {% for color in colors %}
            <li>{{ color }}</li>        
        {% endfor %}
    </ul>

    {{ asset('/css/styles.css') }}

{% endblock %}

一切正常，但是当我在另一个 twig 文件中使用 asset 时，我会得到这个错误：

Twig_Error_Syntax in Parser.php line 370:
A template that extends another one cannot have a body in "admin/dashboard.twig" at line 3.

例如，我的 AdminDashboard 控制器包含：

<?php


namespace App\Controller\Admin;

use Silex\Application;

class AdminDashboard
{

    function __construct()
    {
        return "Dashboard";

    }

    function indexAction(Application $app)
    {
        return $app['twig']->render('admin/dashboard.twig', array(
            'title' => "Hello World",
            'colors' => array("red", "green", "yellow"),
        ));
    }


}

和admin/dashboard.twig包含：

{% extends "layout.twig" %}

{{ asset('/css/styles.css') }}

但是当我访问我的 admin 页面时，出现上述错误。

Answer 1

请阅读错误信息，与函数调用无关：

A template that extends another one cannot have a body

您的 admin/dashboard.twig 文件的第一行有 {% extends ... %}，这意味着它扩展了另一个模板。正如您在错误消息中看到的，扩展另一个模板的模板不能有正文。它只能填充父模板定义的块。

扩展 Twig 以定义资产 url

extend Twig to define assets url

php

symfony

twig

silex