magento - 父级::__construct();函数导致问题，因为 setData() 表示没有对象，对于一个简单的 block

Question

全部来自parent::__construct();

Fatal error: Call to a member function setData() on a non-object in /home/desbest/public_html/clients/magentofull/app/code/core/Mage/Adminhtml/Block/Widget/Form/Container.php on line 129

<?php 
class Desbest_Brands_Block_Adminhtml_Brand_Edit extends Mage_Adminhtml_Block_Widget_Form_Container
{
    public function __construct()
    {
        parent::__construct();

        $this->_objectId = 'id';
        $this->_blockGroup = 'brands';
        $this->_controller = 'adminhtml_example';
        $this->_mode = 'edit';

        $this->_addButton('save_and_continue', array(
                  'label' => Mage::helper('adminhtml')->__('Save And Continue Edit'),
                  'onclick' => 'saveAndContinueEdit()',
                  'class' => 'save',
        ), -100);
        $this->_updateButton('save', 'label', Mage::helper('brands')->__('Save Example'));

        $this->_formScripts[] = "
            function toggleEditor() {
                if (tinyMCE.getInstanceById('form_content') == null) {
                    tinyMCE.execCommand('mceAddControl', false, 'edit_form');
                } else {
                    tinyMCE.execCommand('mceRemoveControl', false, 'edit_form');
                }
            }

            function saveAndContinueEdit(){
                editForm.submit($('edit_form').action+'back/edit/');
            }
        ";
    }

    public function getHeaderText()
    {
        if (Mage::registry('example_data') && Mage::registry('example_data')->getId())
        {
            return Mage::helper('brands')->__('Edit Example "%s"', $this->htmlEscape(Mage::registry('example_data')->getName()));
        } else {
            return Mage::helper('brands')->__('New Example');
        }
    }

}

Answer 1

假设您正在处理 Magento 的纯净版本，请查看第 129 行

127:    public function getFormHtml()
128:    {
129:        $this->getChild('form')->setData('action', $this->getSaveUrl());
130:        return $this->getChildHtml('form');
131:    }

您可以看到尝试获取名为 form 的子 block 无法返回对象。最有可能的是，这是因为在准备布局方法中，Magento 未能实例化表单

protected function _prepareLayout()
{
    if ($this->_blockGroup && $this->_controller && $this->_mode) {
        $this->setChild('form', $this->getLayout()->createBlock($this->_blockGroup . '/' . $this->_controller . '_' . $this->_mode . '_form'));
    }
    return parent::_prepareLayout();
}

因为您的类上未设置以下变量之一

$this->_blockGroup
$this->_controller
$this->_mode

或者字符串生成的类别名

$this->_blockGroup . '/' . $this->_controller . '_' . $this->_mode . '_form'

不是一个有效的 block 类。在不知道你想做什么的情况下，我建议

public function __construct()
{
    $this->_objectId = 'id';
    $this->_blockGroup = 'brands';
    $this->_controller = 'adminhtml_example';
    $this->_mode = 'edit';    
    parent::__construct();

并确保您有别名的 block 类

brands/adminhtml_example_edit_form
//from
//$this->_blockGroup . '/' . $this->_controller . '_' . $this->_mode . '_form'

这很可能是一个名为

的类

class Desbest_Brands_Block_Adminhtml_Example_Edit_Form extends Mage_Adminhtml_Block_Widget_Form
{
    //...
}