[英]How do I work with many-to-many relations in Yii2
For example in one-to-many due to documentation ( http://www.yiiframework.com/doc-2.0/guide-db-active-record.html#relational-data ) you can link two models in this way (one-many = company-zone)
: 例如,由于文档( http://www.yiiframework.com/doc-2.0/guide-db-active-record.html#relational-data )一对多,您可以通过这种方式链接两个模型
(one-many = company-zone)
:
$defaultZone = new Zone;
$defaultZone->name = Zone::DEFAULT_ZONE;
$company->link('zones', $defaultZone);
But how it works for many-to-many relations when you have transit table like tbl_user_market(user_id, market_id)
? 但是,当您拥有
tbl_user_market(user_id, market_id)
这样的运输表时,它如何用于多对多关系?
When using a junction table for many-to-many relations, you have to 当使用联结表进行多对多关系时,您必须
In the User model define the following relation function: 在用户模型中,定义以下关系函数:
public function getMarkets() {
return $this->hasMany(Market::className(), ['id' => 'market_id'])
->viaTable('tbl_user_market', ['user_id' => 'id']);
}
In the Market model define the following relation function: 在市场模型中,定义以下关系函数:
public function getUsers() {
return $this->hasMany(User::className(), ['id' => 'user_id'])
->viaTable('tbl_user_market', ['market_id' => 'id']);
}
And finally, after saving both models, link them together: 最后,保存两个模型后,将它们链接在一起:
$user = new User;
$user->name = 'Foo';
$user->save();
$market = new Market;
$market->name = 'Bar';
$market->save();
$user->link('markets', $market);
The call to link()
will populate the junction table. 对
link()
的调用将填充联结表。
Reference: http://www.yiiframework.com/doc-2.0/yii-db-baseactiverecord.html#link()-detail 参考: http : //www.yiiframework.com/doc-2.0/yii-db-baseactiverecord.html#link()-detail
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