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我正在尝试创建一个选择特定产品及其所有属性的模型。

$products = Mage::getModel('catalog/product')->getCollection()->addAttributeToSelect('*');

但遗憾的是，尽管我之前已经这样做了数百次，但我们正在经历一个 Magento 时刻......

echo $products->getSelect()->__toString();

表明 ->addAttributeToSelect 忽略了我。

SELECT `e`.* FROM `catalog_product_entity` AS `e`

当然，在典型的 Magento 方式中，没有任何类型的异常或错误。

我在我自己的 Adminhtml Grid 块中调用这些方法，缓存被禁用（即使我知道 Magento 在禁用缓存时仍然缓存一些模型数据（我删除了 var/cache）。

我什至做不到：

->addAttributeToSelect('name');

我真的开始对这个平台失去耐心了，我已经使用它 4 个月了，它似乎浪费的时间多于节省的时间。任何帮助都可以挽救生命！

4

1 回答 1

16

您需要深入研究 Magento 以了解 Magento ORM 的工作原理（EAV 结构是什么以及集合实际如何工作）。

为了获得所有产品属性，这是正确的：

$collection = Mage::getModel('catalog/product')->getCollection()->addAttributeToSelect('*');

您缺少的是，当您这样做时，Magento 不会为您提供集合的所有相关查询：

echo $collection->getSelect()//note: you don't need __toString(), read about OOP in PHP5

当您运行代码只是为了获取集合时，Magento 将只运行以下查询：

SELECT `e`.* FROM `catalog_product_entity` AS `e`

当您开始遍历集合时：

$collection = Mage::getModel('catalog/product')->getCollection()->addAttributeToSelect('*');
foreach($collection as $p) {
    echo $p->getName()."\n";//you can use in here any getCustomAttribute method
}

Magento 将运行额外的查询来获取所有的属性和值：

SELECT `main_table`.`entity_type_id`, `main_table`.`attribute_code`, `main_table`.`attribute_model`, `main_table`.`backend_model`, `main_table`.`backend_type`, `main_table`.`backend_table`, `main_table`.`frontend_model`, `main_table`.`frontend_input`, `main_table`.`frontend_label`, `main_table`.`frontend_class`, `main_table`.`source_model`, `main_table`.`is_required`, `main_table`.`is_user_defined`, `main_table`.`default_value`, `main_table`.`is_unique`, `main_table`.`note`, `additional_table`.* FROM `eav_attribute` AS `main_table`
 INNER JOIN `catalog_eav_attribute` AS `additional_table` ON additional_table.attribute_id = main_table.attribute_id WHERE (main_table.entity_type_id = 10)

SELECT `t_d`.`entity_id`, `t_d`.`attribute_id`, `t_d`.`value` AS `default_value`, `t_s`.`value` AS `store_value`, IF(t_s.value_id IS NULL, t_d.value, t_s.value) AS `value` FROM `catalog_product_entity_text` AS `t_d`
 LEFT JOIN `catalog_product_entity_text` AS `t_s` ON t_s.attribute_id = t_d.attribute_id AND t_s.entity_id = t_d.entity_id AND t_s.store_id = 1 WHERE (t_d.entity_type_id = 10) AND (t_d.entity_id IN (16, 17, 18, 19, 20, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 41, 42, 44, 45, 46, 47, 48, 49, 51, 52, 53, 54, 74, 75, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166)) AND (t_d.attribute_id IN ('496', '507', '531', '97', '494', '509', '499', '492', '498', '104', '495', '497', '936', '500', '476', '506')) AND (t_d.store_id = 0) UNION ALL SELECT `t_d`.`entity_id`, `t_d`.`attribute_id`, `t_d`.`value` AS `default_value`, `t_s`.`value` AS `store_value`, IF(t_s.value_id IS NULL, t_d.value, t_s.value) AS `value` FROM `catalog_product_entity_int` AS `t_d`
 LEFT JOIN `catalog_product_entity_int` AS `t_s` ON t_s.attribute_id = t_d.attribute_id AND t_s.entity_id = t_d.entity_id AND t_s.store_id = 1 WHERE (t_d.entity_type_id = 10) AND (t_d.entity_id IN (16, 17, 18, 19, 20, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 41, 42, 44, 45, 46, 47, 48, 49, 51, 52, 53, 54, 74, 75, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166)) AND (t_d.attribute_id IN ('272', '510', '875', '877', '903', '501', '935', '952', '904', '102', '513', '110', '859', '862', '508', '863', '525', '502', '107', '860', '273', '274', '526', '861')) AND (t_d.store_id = 0) UNION ALL SELECT `t_d`.`entity_id`, `t_d`.`attribute_id`, `t_d`.`value` AS `default_value`, `t_s`.`value` AS `store_value`, IF(t_s.value_id IS NULL, t_d.value, t_s.value) AS `value` FROM `catalog_product_entity_decimal` AS `t_d`
 LEFT JOIN `catalog_product_entity_decimal` AS `t_s` ON t_s.attribute_id = t_d.attribute_id AND t_s.entity_id = t_d.entity_id AND t_s.store_id = 1 WHERE (t_d.entity_type_id = 10) AND (t_d.entity_id IN (16, 17, 18, 19, 20, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 41, 42, 44, 45, 46, 47, 48, 49, 51, 52, 53, 54, 74, 75, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166)) AND (t_d.attribute_id IN ('100', '960', '503', '943', '99', '567', '270', '101')) AND (t_d.store_id = 0) UNION ALL SELECT `t_d`.`entity_id`, `t_d`.`attribute_id`, `t_d`.`value` AS `default_value`, `t_s`.`value` AS `store_value`, IF(t_s.value_id IS NULL, t_d.value, t_s.value) AS `value` FROM `catalog_product_entity_varchar` AS `t_d`
 LEFT JOIN `catalog_product_entity_varchar` AS `t_s` ON t_s.attribute_id = t_d.attribute_id AND t_s.entity_id = t_d.entity_id AND t_s.store_id = 1 WHERE (t_d.entity_type_id = 10) AND (t_d.entity_id IN (16, 17, 18, 19, 20, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 41, 42, 44, 45, 46, 47, 48, 49, 51, 52, 53, 54, 74, 75, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166)) AND (t_d.attribute_id IN ('940', '571', '271', '562', '878', '106', '879', '906', '873', '703', '105', '103', '942', '941', '96', '836', '931', '874', '876', '905', '109', '880', '493', '881', '481', '570')) AND (t_d.store_id = 0) UNION ALL SELECT `t_d`.`entity_id`, `t_d`.`attribute_id`, `t_d`.`value` AS `default_value`, `t_s`.`value` AS `store_value`, IF(t_s.value_id IS NULL, t_d.value, t_s.value) AS `value` FROM `catalog_product_entity_datetime` AS `t_d`
 LEFT JOIN `catalog_product_entity_datetime` AS `t_s` ON t_s.attribute_id = t_d.attribute_id AND t_s.entity_id = t_d.entity_id AND t_s.store_id = 1 WHERE (t_d.entity_type_id = 10) AND (t_d.entity_id IN (16, 17, 18, 19, 20, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 41, 42, 44, 45, 46, 47, 48, 49, 51, 52, 53, 54, 74, 75, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166)) AND (t_d.attribute_id IN ('572', '573', '704', '705', '568', '569')) AND (t_d.store_id = 0)

要了解有关在各种上下文中运行哪些查询的更多信息，请创建一个空脚本，仅加载Mage::app()并使用集合并将 $_logAllQueries 设置为 true in Varien_Db_Adapter_Pdo_Mysql。附加信息：这里。

于 2013-03-08T16:35:17.857 回答