Php SilverStripe如何写对外关系'；s场

将表单值写入外部关系字段的最佳方式是什么？

我需要将

$coachField

的值保存到外部表中的特定列中。IE:在

团队

对象表单中，我需要能够保存

教练

的姓名（该姓名与记录有一一对应关系）

我倾向于在

Team

中使用onAfterWrite来获取教练的名字，但我不确定首先如何检索值，最重要的是，这是否是最好的方法

当前数据对象

class Team extends DataObject {

    // The value needs to be saved in Coach->Name
    private static $has_one = array(
        'Coach' => 'Coach'
    );

    public function getCMSFields() {

        // The form field where to get the value from
        $coachField = TextField::create('CoachName', 'Who is the coach');

    }
}

class Coach extends DataObject {

    // Here's where the name should be written to
    private static $db = array(
        'Name' => 'Varchar'
    );

    private static $belongs_to = array(
        'Team' => 'Team'
    );
}

外部数据对象

class Team extends DataObject {

    // The value needs to be saved in Coach->Name
    private static $has_one = array(
        'Coach' => 'Coach'
    );

    public function getCMSFields() {

        // The form field where to get the value from
        $coachField = TextField::create('CoachName', 'Who is the coach');

    }
}

class Coach extends DataObject {

    // Here's where the name should be written to
    private static $db = array(
        'Name' => 'Varchar'
    );

    private static $belongs_to = array(
        'Team' => 'Team'
    );
}

---

对于1:1关系，可以使用模块。字段的名称应为

HasOneName-\u 1\u-FieldName

like

class Team extends DataObject {

    // The value needs to be saved in Coach->Name
    private static $has_one = array(
        'Coach' => 'Coach'
    );

    public function getCMSFields() {

        $fields = parent::getCMSFields(); //scaffold all fields

        // The form field where to get the value from
        $fields->addFieldsToTab('Root.Main', TextField::create('Coach-_1_-Name', 'Who is the coach');

        return $fields;
    }
}

---

它会神奇地自动保存到has_one关系。

就像一个符咒。