在行为yii2的init中获取模型的属性

这是我的密码：

class CalculatedFieldsBehavior extends Behavior {
    public $calcFields = array();

    public function events() {
        return [
            ActiveRecord::EVENT_INIT => 'init',
        ];
    }

    public function init() {
        foreach ($this->owner->attributes() as $attribute) {
            if (strpos($attribute, 'calc_')) {
                if (!is_function(get_parent_class()::$set . \yii\helpers\camelize($attribute))) {
                    throw Exception("Function to set value of calc field '" . $attribute . "' not defined.");
                }

                $calcFields[] = $attribute;
            }
        }

        if (!($this->owner->hasAttribute('isCalcValueSet'))) {
            throw Exception("This table is missing a field for isCalcValueSet");
        }

        parent::init();
    }
}

并给出以下错误：

$owner在init中不可用。这是设定的。工作流通常如下所示：

$behavior = new MyBehavior(); // init() is called here
$behavior->attach($owner); // owner is set here

在您的情况下，您可能应该覆盖attach：

public function attach($owner) {
    foreach ($owner->attributes() as $attribute) {
        if (strpos($attribute, 'calc_')) {
            if (!is_function(get_parent_class()::$set . \yii\helpers\camelize($attribute))) {
                throw Exception("Function to set value of calc field '" . $attribute . "' not defined.");
            }

            $calcFields[] = $attribute;
        }
    }

    if (!($owner->hasAttribute('isCalcValueSet'))) {
        throw Exception("This table is missing a field for isCalcValueSet");
    }

    parent::attach($owner);
}

---

可以移动parent:：init；到初始化的第一行？

public function attach($owner) {
    foreach ($owner->attributes() as $attribute) {
        if (strpos($attribute, 'calc_')) {
            if (!is_function(get_parent_class()::$set . \yii\helpers\camelize($attribute))) {
                throw Exception("Function to set value of calc field '" . $attribute . "' not defined.");
            }

            $calcFields[] = $attribute;
        }
    }

    if (!($owner->hasAttribute('isCalcValueSet'))) {
        throw Exception("This table is missing a field for isCalcValueSet");
    }

    parent::attach($owner);
}