我尝试在表单中输入belongsToMany
关联,但这是一个非常特殊的关联描述
因为我的实体Site
可以将语言用于2种不同的用法,所以我使用2个连接表
架构如下
Relationship Join Table Fields
Sites belongsToMany Vislanguages sites_vislanguages.id, sites_vislanguages.language_id, sites_vislanguages.site_id
Relationship Join Table Fields
Sites belongsToMany Reclanguages sites_reclanguages.id, sites_reclanguages.language_id, sites_reclanguages.site_id
所以Table
类是:
class VislanguagesTable extends Table {
public function initialize(array $config) {
parent::initialize($config);
$this->table('languages');
$this->displayField('name_fr');
$this->primaryKey('id');
$this->belongsToMany('Sites', [
'foreignKey' => 'language_id',
'targetForeignKey' => 'site_id',
'joinTable' => 'sites_vislanguages',
]);
}
}
class SitesTable extends Table {
public function initialize(array $config) {
parent::initialize($config);
$this->belongsToMany('Reclanguages', [
'joinTable' => 'sites_reclanguages',
'className' => 'Languages',
'propertyName' => 'reclanguages'
]);
$this->belongsToMany('Vislanguages', [
'joinTable' => 'sites_vislanguages',
'className' => 'Languages',
'propertyName' => 'vislanguages'
]);
}
class SitesVislanguagesTable扩展了表格{
public function initialize(array $config) {
parent::initialize($config);
$this->table('sites_vislanguages');
$this->displayField('id');
$this->primaryKey('id');
$this->belongsTo('Sites', [
'foreignKey' => 'site_id',
]);
$this->belongsTo('Languages', [
'foreignKey' => 'language_id',
]);
}
我当然对add
和edit
表单存在问题,但我这里以edit
为例。
如果我find()
已准备好site
,则数据结构为:
object(App\Model\Entity\Site) {
'id' => (int) 23098,
'Vislanguages' => [
(int) 0 => object(App\Model\Entity\Language) {
'id' => (int) 1,
'_joinData' => object(App\Model\Entity\SitesVislanguage) {
'id' => (int) 4409,
'site_id' => (int) 23098,
'language_id' => (int) 1,
...,
'[repository]' => 'SitesVislanguages'
},
...,
'[repository]' => 'Vislanguages'
},
(int) 1 => object(App\Model\Entity\Language) {
'id' => (int) 9,
'_joinData' => object(App\Model\Entity\SitesVislanguage) {
'id' => (int) 4410,
'site_id' => (int) 23098,
'language_id' => (int) 9,
...,
'[repository]' => 'SitesVislanguages'
},
...,
'[repository]' => 'Vislanguages'
}
],
...,
'[repository]' => 'Sites'
}
我相应的ctp
文件是:
<?= $this->Form->control('vislanguages._ids', ['options' => $languages, 'label' => __('Spoken languages:'), 'multiple' => true]); ?>
在输入中正确预选了语言。 如果我在没有任何更改的情况下提交,修补后的实体是:
对象(App \ Model \ Entity \ Site){
'id' => (int) 23098,
...,
'vislanguages' => [
(int) 0 => object(App\Model\Entity\Language) {
'id' => (int) 1,
...,
'[repository]' => 'Vislanguages'
},
(int) 1 => object(App\Model\Entity\Language) {
'id' => (int) 9,
...,
'[repository]' => 'Vislanguages'
}
],
'[repository]' => 'Sites'
}
这似乎是正确的但是当我保存它时,我收到以下错误:
Error: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'vislanguage_id' in 'where clause'
查询是:
(SELECT SitesVislanguages.id AS `SitesVislanguages__id`, SitesVislanguages.site_id AS `SitesVislanguages__site_id`, SitesVislanguages.language_id AS `SitesVislanguages__language_id` FROM sites_vislanguages SitesVislanguages WHERE (site_id = :c0 AND vislanguage_id = :c1))
UNION (SELECT SitesVislanguages.id AS `SitesVislanguages__id`, SitesVislanguages.site_id AS `SitesVislanguages__site_id`, SitesVislanguages.language_id AS `SitesVislanguages__language_id` FROM sites_vislanguages SitesVislanguages WHERE (site_id = :c2 AND vislanguage_id = :c3))
为什么我们在vislanguage_id
子句中看到WHERE
,而在language_id
子句中却正确地考虑了SELECT
?
与此同时,我并不真正理解UNION
。
答案 0 :(得分:0)
要使其正常运行,我必须指定targetForeignKey
:
class SitesTable extends Table {
public function initialize(array $config) {
parent::initialize($config);
$this->belongsToMany('Reclanguages', [
'targetForeignKey' => 'language_id,
'joinTable' => 'sites_reclanguages',
'className' => 'Languages',
'propertyName' => 'reclanguages'
]);
$this->belongsToMany('Vislanguages', [
'targetForeignKey' => 'language_id,
'joinTable' => 'sites_vislanguages',
'className' => 'Languages',
'propertyName' => 'vislanguages'
]);
}