Xml Magento模块未加载

这是我的config.xml

    <?xml version="1.0" encoding="UTF-8"?>
<config>
    <modules>
        <zee_Checkout>
            <version>1.0</version>
        </zee_Checkout>
    </modules>
    <global>
        <models>
            <zee_Checkout>zee_Checkout_Model</zee_Checkout>
            <checkout>
                <rewrite>
                    <type_onepage>zee_Checkout_Model_Type_Onepage</type_onepage>
                </rewrite>
            </checkout>
        </models>
    </global>
</config>

<?xml version="1.0" encoding="UTF-8"?>
<config>
    <modules>
        <Zee_Checkout> <!-- zee should be  Zee -->
            <version>1.0</version>
        </Zee_Checkout>
    </modules>
    <global>
        <models>
            <zee_checkout>zee_Checkout_Model</zee_checkout>
            <checkout>
                <rewrite>
                    <type_onepage>Zee_Checkout_Model_Type_Onepage</type_onepage>
                </rewrite>
            </checkout>
        </models>
    </global>
</config>

<?xml version="1.0" encoding="UTF-8"?>
<config>
<modules>
    <Zee_Checkout>
        <version>1.0</version>
    </Zee_Checkout>
</modules>
<global>
    <models>
        <checkout>zee_Checkout_Model</checkout>
        <checkout>
            <rewrite>
                <type_onepage>Zee_Checkout_Model_Type_Onepage</type_onepage>
            </rewrite>
        </checkout>
    </models>
</global>
</config>

问题是。。。。此函数未加载。。。而是执行来自父/核心magento文件的保存顺序

模块已启用并在Magento后端中显示。。但代码不会执行

有什么想法吗？？？我是否遗漏了一些东西？？？

config.xml中的更改

    <?xml version="1.0" encoding="UTF-8"?>
<config>
    <modules>
        <zee_Checkout>
            <version>1.0</version>
        </zee_Checkout>
    </modules>
    <global>
        <models>
            <zee_Checkout>zee_Checkout_Model</zee_Checkout>
            <checkout>
                <rewrite>
                    <type_onepage>zee_Checkout_Model_Type_Onepage</type_onepage>
                </rewrite>
            </checkout>
        </models>
    </global>
</config>

<?xml version="1.0" encoding="UTF-8"?>
<config>
    <modules>
        <Zee_Checkout> <!-- zee should be  Zee -->
            <version>1.0</version>
        </Zee_Checkout>
    </modules>
    <global>
        <models>
            <zee_checkout>zee_Checkout_Model</zee_checkout>
            <checkout>
                <rewrite>
                    <type_onepage>Zee_Checkout_Model_Type_Onepage</type_onepage>
                </rewrite>
            </checkout>
        </models>
    </global>
</config>

<?xml version="1.0" encoding="UTF-8"?>
<config>
<modules>
    <Zee_Checkout>
        <version>1.0</version>
    </Zee_Checkout>
</modules>
<global>
    <models>
        <checkout>zee_Checkout_Model</checkout>
        <checkout>
            <rewrite>
                <type_onepage>Zee_Checkout_Model_Type_Onepage</type_onepage>
            </rewrite>
        </checkout>
    </models>
</global>
</config>

到

---

为模型设置别名时出错。 尝试改变

<zee_checkout>Zee_Checkout_Model</zee_checkout>

到

---

在文件夹app/etc/modules中设置Zee_Checkout.xml启用

<?xml version="1.0"?>
<config>
    <modules>
    <Zee_Checkout>
        <active>true</active>
        <codePool>local</codePool>
    </Zee_Checkout>
    </modules>
</config>

---

谢谢我做到了。。。但我的自定义函数仍然没有覆盖父类函数。。。有什么帮助吗？有什么想法吗？

<?xml version="1.0" encoding="UTF-8"?>
<config>
<modules>
    <Zee_Checkout>
        <version>1.0</version>
    </Zee_Checkout>
</modules>
<global>
    <models>
        <checkout>zee_Checkout_Model</checkout>
        <checkout>
            <rewrite>
                <type_onepage>Zee_Checkout_Model_Type_Onepage</type_onepage>
            </rewrite>
        </checkout>
    </models>
</global>
</config>

public function __construct()
{
    Mage::log('hellloss',null,'hello.log');
    $this->_helper = Mage::helper('checkout');
    $this->_customerEmailExistsMessage = Mage::helper('checkout')->__('There is already a customer registered using this email address. Please login using this email address or enter a different email address to register your account.');
    $this->_checkoutSession = Mage::getSingleton('checkout/session');
    $this->_customerSession = Mage::getSingleton('customer/session');
}