CakePHP 2 - 链接到同一个表主键的表的两个外键

Question

我如何在这里使用 cakephp 2X 模型 hasone 或其他关联概念来执行查找查询。

在我的 Schinfo.php 模型中是

class Schinfo extends AppModel {
    public $tablePrefix = 'sko_';
    public $hasOne = [
        'State' => [
            'className' => 'Masterlocation',
            'foreignKey' => 'master_locid'
        ],
        'City' => [
            'className' => 'Masterlocation',
            'foreignKey' => 'master_locid'
        ],
        'Area' => [
            'className' => 'Masterlocation',
            'foreignKey' => 'master_locid'
        ]
    ];
}

通过以上我得到了

SELECT
    `Schinfo`.`skool_id`,
    `Schinfo`.`skool_code`,
    `Schinfo`.`skool_name`,
    `Schinfo`.`skool_addr`,
    `Schinfo`.`master_state_id`,
    `Schinfo`.`master_city_id`,
    `Schinfo`.`master_area_id`,
    `Schinfo`.`skool_pin`,
    `Schinfo`.`skool_board`,
    `Schinfo`.`skool_type_id`,
    `Schinfo`.`skool_affilated_to`,
    `Schinfo`.`skool_affilated_no`,
    `Schinfo`.`skool_contact_no`,
    `Schinfo`.`skool_mailid`,
    `Schinfo`.`skool_website`,
    `Schinfo`.`skool_logo`,
    `Schinfo`.`skool_delete`,
    `State`.`master_locid`,
    `State`.`master_parentid`,
    `State`.`master_locname`,
    `State`.`is_checked`,
    `City`.`master_locid`,
    `City`.`master_parentid`,
    `City`.`master_locname`,
    `City`.`is_checked`,
    `Area`.`master_locid`,
    `Area`.`master_parentid`,
    `Area`.`master_locname`,
    `Area`.`is_checked` 
FROM
    `skoolata`.`sko_schinfos` AS `Schinfo` 
    LEFT JOIN
        `skoolata`.`sko_masterlocations` AS `State` 
        ON (`State`.`master_locid` = `Schinfo`.`id`) 
    LEFT JOIN
        `skoolata`.`sko_masterlocations` AS `City` 
        ON (`City`.`master_locid` = `Schinfo`.`id`) 
    LEFT JOIN
        `skoolata`.`sko_masterlocations` AS `Area` 
        ON (`Area`.`master_locid` = `Schinfo`.`id`) 
WHERE
    1 = 1

现在我需要改变

LEFT JOIN
    skoolata.sko_masterlocations AS State
    ON (State.master_locid = Schinfo.id) 
LEFT JOIN
    skoolata.sko_masterlocations AS City 
    ON (City.master_locid = Schinfo.id) 
LEFT JOIN
    skoolata.sko_masterlocations AS Area 
    ON (Area.master_locid = Schinfo.id)

到

LEFT JOIN
    skoolata.sko_masterlocations AS State
    ON (State.master_locid = Schinfo.master_state_id) 
LEFT JOIN
    skoolata.sko_masterlocations AS City 
    ON (City.master_locid = Schinfo.master_city_id) 
LEFT JOIN
    skoolata.sko_masterlocations AS Area 
    ON (Area.master_locid = Schinfo.master_area_id)

得到我想要的输出

Answer 1

您想要定义三个关系，Country、State 和 City，并为每个关系指定 className 作为您要链接到的模型，例如 Location。然后，您还可以使用foreignKey 指定将用作Student 模型中的外键的列：-

public $hasOne = [
    'Country' => [
        'className' => 'Location',
        'foreignKey' => 'country_id'
    ],
    'State' => [
        'className' => 'Location',
        'foreignKey' => 'state_id'
    ],
    'City' => [
        'className' => 'Location',
        'foreignKey' => 'city_id'
    ]
];

那么在查找结果时，您可以使用contain，例如：-

$students = $this->Student->find('all', [
    'contain' => ['Country', 'State', 'City']
]);