我有一个Symfony 4.2框架，我试图基于App基本模板生成自定义错误模板。
我的默认模板在“ Default / template.html.twig”中具有以下代码：
{% trans_default_domain "messages" %}
<!DOCTYPE html >
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>{% block title %}{{ 'Gibbon - Mobile'|trans }}{% endblock title %}</title>
{% block stylesheets %}
{% endblock stylesheets %}
</head>
<body>
<div class="container mobileContent">
{% block titleBar %}
<div id="titleBar">
<h2 class="alert alert-success text-center">{{ title|default('Gibbon - Mobile')|trans }}
<div style="float: left;">{{ miscButton({title: 'Home', style: 'margin-top: -0.6rem;', class: 'btn btn-transparent alert-success fas fa-home fa-fw fa-2x', windowOpen: {route: path('home')}})|raw }}
</div>
{% block menuContent %}
<div id="notificationTray" style="float: right;"></div>
{% endblock menuContent %}
</h2></div>
{% endblock titleBar %}
...
... （已删除其他内容。）
在“ Error / connection_exception.html.twig”模板的呈现器中的ExceptionController中调用 miscButton 函数时，会发生问题：
<?php
namespace App\Controller;
use Doctrine\DBAL\Exception\ConnectionException;
use Symfony\Bundle\TwigBundle\Controller\ExceptionController as ExceptionControllerBase;
use Symfony\Component\Debug\Exception\FlattenException;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpKernel\Log\DebugLoggerInterface;
/**
* Class ExceptionController
* @package App\Controller
*/
class ExceptionController extends ExceptionControllerBase
{
/**
* Converts an Exception to a Response.
*
* A "showException" request parameter can be used to force display of an error page (when set to false) or
* the exception page (when true). If it is not present, the "debug" value passed into the constructor will
* be used.
*
* @return Response
*
* @throws \InvalidArgumentException When the exception template does not exist
*/
public function showAction(Request $request, FlattenException $exception, DebugLoggerInterface $logger = null)
{
$currentContent = $this->getAndCleanOutputBuffering($request->headers->get('X-Php-Ob-Level', -1));
$showException = $request->attributes->get('showException', $this->debug); // As opposed to an additional parameter, this maintains BC
$code = $exception->getStatusCode();
if (ConnectionException::class === $exception->getClass()) {
return new Response($this->twig->render(
'Error/connection_exception.html.twig',
[
'status_code' => $code,
'status_text' => isset(Response::$statusTexts[$code]) ? Response::$statusTexts[$code] : '',
'exception' => $exception,
'logger' => $logger,
'currentContent' => $currentContent,
]
), 200, ['Content-Type' => $request->getMimeType($request->getRequestFormat()) ?: 'text/html']);
} else
return new Response($this->twig->render(
(string) $this->findTemplate($request, $request->getRequestFormat(), $code, $showException),
array(
'status_code' => $code,
'status_text' => isset(Response::$statusTexts[$code]) ? Response::$statusTexts[$code] : '',
'exception' => $exception,
'logger' => $logger,
'currentContent' => $currentContent,
)
), 200, array('Content-Type' => $request->getMimeType($request->getRequestFormat()) ?: 'text/html'));
}
}
仅在遇到异常时调用。这已在twig的服务文件中设置为异常控制器：
twig:
...
exception_controller: App\Controller\ExceptionController::showAction
树枝模板'Error / connection_exception.html.twig'是：
{% trans_default_domain "messages" %}
{% extends 'Default/template.html.twig' %}
{% set title = 'Connection Exception' %}
{% block content %}
<div class="container">
{{ dump() }}
</div>
{% endblock content %}
系统抛出以下内容的Twig_Error_Syntax： Twig_Error_Syntax 未知的“ miscButton”功能。
in template.html.twig line 17
at Twig_ExpressionParser->getFunctionNodeClass('miscButton', 17)
in ExpressionParser.php line 367
at Twig_ExpressionParser->getFunctionNode('miscButton', 17)
in ExpressionParser.php line 152
at Twig_ExpressionParser->parsePrimaryExpression()
in ExpressionParser.php line 92
at Twig_ExpressionParser->getPrimary()
in ExpressionParser.php line 45
at Twig_ExpressionParser->parseExpression()
in Parser.php line 125
at Twig_Parser->subparse(array(object(Twig_TokenParser_Block), 'decideBlockEnd'), true)
in Block.php line 38
at Twig_TokenParser_Block->parse(object(Twig_Token))
in Parser.php line 168
at Twig_Parser->subparse(null, false)
in Parser.php line 81
at Twig_Parser->parse(object(Twig_TokenStream))
in Environment.php line 533
at Twig_Environment->parse(object(Twig_TokenStream))
in Environment.php line 565
at Twig_Environment->compileSource(object(Twig_Source))
in Environment.php line 368
at Twig_Environment->loadTemplate('Default/template.html.twig', null)
in Template.php line 330
at Twig_Template->loadTemplate('Default/template.html.twig', 'Error/connection_exception.html.twig', 3)
in 8039d13d7f19bf3be65e86c362558a70fd97574adf50f4ff5ebd74542210f233.php line 15
at __TwigTemplate_da37c7d18d4bfb02766acd7d18a05f51739a25a6224cafdd1b0abb0753679771->__construct(object(Twig_Environment))
in Environment.php line 397
at Twig_Environment->loadTemplate('Error/connection_exception.html.twig')
in Environment.php line 289
at Twig_Environment->render('Error/connection_exception.html.twig', array('status_code' => 500, 'status_text' => 'Internal Server Error', 'exception' => object(FlattenException), 'logger' => object(Logger), 'currentContent' => ''))
in ExceptionController.php line 73
at ExceptionController->showAction(object(Request), object(FlattenException), object(Logger))
in HttpKernel.php line 150
如果错误未引起重定向，则不会不发生此错误。函数 miscButton 显示在debug：twig命令中
php bin/console debug:twig
Functions
---------
...
* max(args)
* min(args)
* miscButton(details = [])
...
构建函数的扩展类在我也已编写的供应商捆绑包中。
那么为什么该功能没有出现在错误模板中，而在其他时间正确显示呢？
感谢您的帮助。克雷格