调用空 ZF2 原则 ORM 2 上的成员函数 - Call to a member function on null ZF2 Doctrine ORM 2

Call to a member function on null ZF2 Doctrine ORM 2

本文关键字：成员函数 ORM ZF2 原则调用 | 更新日期: 2023-09-27

$section =  $objectManager->find('OEC'Entity'Section', $sectionId );
$class   =  $objectManager->find('OEC'Entity'Classes', $section->getClassId() );
$cycle   =  $objectManager->find('OEC'Entity'Cycle', $class->getCycleId() );
$branch  =  $objectManager->find('OEC'Entity'Branch', $cycle->getBranchId() );
$sectionArr = $class->getClassName()." ".$section->getSectionName()." - ". $branch->getBranchName()." ".$cycle->getCycleName();
$objectManager->close();

我得到了Call to a member function getCycleId() on null，尽管如果我在每个变量之后print_r($variable);exit;，我会得到一个结果直到最后，只有当我删除它时，它才会给我错误。有什么解决办法？

尝试使用如下内容对其进行调试：

$section =  $objectManager->find('OEC'Entity'Section', $sectionId );
$class   =  $objectManager->find('OEC'Entity'Classes', $section->getClassId() );
if ($class === null) {
    /* add debug info here*/ 
    var_dump('ID of class was '.$section->getClassId());
    var_dump('ID of section was '.$sectionId);
    var_dump((new 'Exception())->getTraceAsString());
    die();
}
$cycle   =  $objectManager->find('OEC'Entity'Cycle', $class->getCycleId() );
$branch  =  $objectManager->find('OEC'Entity'Branch', $cycle->getBranchId() );
$sectionArr = $class->getClassName()." ".$section->getSectionName()." - ". $branch->getBranchName()." ".$cycle->getCycleName();
$objectManager->close();

就像我在评论中所说的那样，也许代码多次运行。