Column 'available_for_order' in where clause is ambiguous - mysql

Question

I'm strugling with this query within prestashop , i know it could be easily fixed by changing to sa.available_for_order but this way it breaks the logic of other core files ,
is there any other way around to fix this without renaming available_for_order to sa.available_for_order ,
SELECT
a.`id_product`,
b.`name` AS `name`,
`reference`,
a.`price` AS `price`,
sa.`active` AS `active`,
`newfield`,
shop.`name` AS `shopname`,
a.`id_shop_default`,
image_shop.`id_image` AS `id_image`,
cl.`name` AS `name_category`,
sa.`price`,
0 AS `price_final`,
a.`is_virtual`,
pd.`nb_downloadable`,
sav.`quantity` AS `sav_quantity`,
sa.`active`,
IF(sav.`quantity` <= 0, 1, 0) AS `badge_danger`,
sa.`available_for_order` AS `available_for_order`
FROM
`ps_product` a
LEFT JOIN
`ps_product_lang` b
ON
(
b.`id_product` = a.`id_product` AND b.`id_lang` = 1 AND b.`id_shop` = 1
)
LEFT JOIN
`ps_stock_available` sav
ON
(
sav.`id_product` = a.`id_product` AND sav.`id_product_attribute` = 0 AND sav.id_shop = 1 AND sav.id_shop_group = 0
)
JOIN
`ps_product_shop` sa
ON
(
a.`id_product` = sa.`id_product` AND sa.id_shop = a.id_shop_default
)
LEFT JOIN
`ps_category_lang` cl
ON
(
sa.`id_category_default` = cl.`id_category` AND b.`id_lang` = cl.`id_lang` AND cl.id_shop = a.id_shop_default
)
LEFT JOIN
`ps_shop` shop
ON
(
shop.id_shop = a.id_shop_default
)
LEFT JOIN
`ps_image_shop` image_shop
ON
(
image_shop.`id_product` = a.`id_product` AND image_shop.`cover` = 1 AND image_shop.id_shop = a.id_shop_default
)
LEFT JOIN
`ps_image` i
ON
(
i.`id_image` = image_shop.`id_image`
)
LEFT JOIN
`ps_product_download` pd
ON
(pd.`id_product` = a.`id_product`)
WHERE
1 AND `available_for_order` = 1
ORDER BY
a.`id_product` ASC
LIMIT 0, 50
PRESTASHOP
public function __construct()
{
parent::__construct();
$this->_select .= ',sa.`available_for_order` AS `available_for_order`, ';
$this->fields_list['sa!available_for_order'] = array(
'title' => $this->l('Available for order'),
'width' => 90,
'active' => 'available_for_order',
'filter_key' => 'sa!available_for_order',
'type' => 'bool',
'align' => 'center',
'orderby' => false
);
}

Answer 1

Modify your fields list to use having filter.
$this->fields_list['available_for_order'] = array(
'title' => $this->l('Available for order'),
'width' => 90,
'active' => 'available_for_order',
'filter_key' => 'available_for_order',
'havingFilter' => true,
'type' => 'bool',
'align' => 'center',
'orderby' => false
);
This will use HAVING instead of WHERE in query.
WHERE clause does not work on column aliases but HAVING does.

Answer 2

The column available_for_order must be in more than one of the tables. Just qualify the column name, as you do in the select:
WHERE 1 AND sa.available_for_order = 1
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