4

I have a requirement to create a number of custom reports on the magento data.

The first job I have to do is to improve on the ‘Products Viewed’ report integrated into Magento.

I have managed to work out that the data for this report is taken from the ‘report_event’ table, however there are some peculiarities with this data I need to understand.

Firstly, I assume that where event_type_id is 1 (i.e. ‘catalog_product_view’ according to the reference table), the columns object_id and subject_id store the ID of the product and the ID of the visitor respectively. However, there are a large number of entries where subject_id is zero, but object_id holds the id of a valid product.

What I need to know is how this can occur… i.e. how can we get an entry in the report_event table where the following are all true:

event_type_id = 1

object_id = [valid product id]

subject_id = 0

Many thanks in anticipation

Si

4

1 回答 1

9

TL;博士：

Areport_event.subject_id == 0通常是被忽略的用户代理或显式排除的路由触发通常由 Magento 记录的事件的结果。

见app/code/core/Mage/Log/etc/config.xml：

<config>
    <global>
        <!-- : -->
        <ignoredModules>
            <entities>
                <install/>
                <adminhtml/>
                <admin/>
            </entities>
        </ignoredModules>
        <ignore_user_agents>
            <google1>Googlebot/1.0 (googlebot@googlebot.com http://googlebot.com/)</google1>
            <google2>Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)</google2>
            <google3>Googlebot/2.1 (+http://www.googlebot.com/bot.html)</google3>
        </ignore_user_agents>
        <!-- : -->
    </global>
</config>

长答案

为了解释为什么会发生这种情况，我需要更详细地说明。

当任何 Magento 控制器动作即将被调度时，controller_action_predispatch将触发一个事件，就在动作调度实际发生之前。

再看看app/code/core/Mage/Log/etc/config.xml：

<config>
    <frontend>
        <events>
            <controller_action_predispatch>
                <observers>
                    <log>
                        <class>log/visitor</class>
                        <method>initByRequest</method>
                    </log>
                </observers>
            </controller_action_predispatch>
            <!-- : -->
        </events>
    </frontend>
</config>

显示，该Mage_Log模块为事件定义了一个观察者controller_action_predispatch，由方法表示Mage_Log_Model_Visitor::initByRequest()：

public function initByRequest($observer)
{
    if ($this->_skipRequestLogging || $this->isModuleIgnored($observer)) {
        return $this;
    }

    $this->setData($this->_getSession()->getVisitorData());
    $this->initServerData();

    if (!$this->getId()) {
        $this->setFirstVisitAt(now());
        $this->setIsNewVisitor(true);
        $this->save();
    }
    return $this;
}

当发送当前请求的用户代理与(GoogleBot)之一匹配时，该属性$this->_skipRequestLogging将为。true<ignored_user_agents />

如果请求路由匹配其中之一（即,或; 在 EE 中也是） ，则该方法$this->isModuleIgnored()仅返回。true<ignoredModules />install/adminhtml/admin/api/

关键是，如果这两者中的一个返回true，则观察者立即退出，即根本不会创建/保存访问者。

现在，为了进一步解释以您的catalog_product_view案例为例，请查看另一个配置文件，app/code/core/Mage/Reports/etc/config.xml这次：

<config>
    <frontend>
        <events>
            <catalog_controller_product_view>
                <observers>
                    <reports>
                        <class>reports/event_observer</class>
                        <method>catalogProductView</method>
                    </reports>
                </observers>
            </catalog_controller_product_view>
            <!-- : -->
        </events>
    </frontend>
</config>

它定义了事件的观察者catalog_controller_product_view，由 Mage_Reports_Model_Event_Observer::catalogProductView()方法表示：

public function catalogProductView(Varien_Event_Observer $observer)
{
    $productId = $observer->getEvent()->getProduct()->getId();

    Mage::getModel('reports/product_index_viewed')
        ->setProductId($productId)
        ->save()
        ->calculate();

    return $this->_event(Mage_Reports_Model_Event::EVENT_PRODUCT_VIEW, $productId);
}

这个观察者的最后一行调用了这个_event()方法：

protected function _event($eventTypeId, $objectId, $subjectId = null, $subtype = 0)
{
    if (is_null($subjectId)) {
        if (Mage::getSingleton('customer/session')->isLoggedIn()) {
            $customer = Mage::getSingleton('customer/session')->getCustomer();
            $subjectId = $customer->getId();
        }
        else {
            $subjectId = Mage::getSingleton('log/visitor')->getId();
            $subtype = 1;
        }
    }

    $eventModel = Mage::getModel('reports/event');
    $storeId    = Mage::app()->getStore()->getId();
    $eventModel
        ->setEventTypeId($eventTypeId)
        ->setObjectId($objectId)
        ->setSubjectId($subjectId)
        ->setSubtype($subtype)
        ->setStoreId($storeId);
    $eventModel->save();

    return $this;
}

看看这个else块，尤其是这一行：

$subjectId = Mage::getSingleton('log/visitor')->getId();

当访问者由于忽略的用户代理或排除的路由而根本没有被创建/保存时，那么$subjectId将是null.

由于表列subject_id被定义为NOT NULL（参见app/code/core/Mage/Reports/sql/reports_setupSQL 脚本），0最终将被保存。

那是因为 MySQL 的数据类型默认值。

于 2012-06-06T17:43:52.263 回答