yii2 save失败的可能原因

1.rules方法中没添加字段规则
2.事务
3.场景
解决办法打印

$model->errors

2.检查是否重写AR生命周期方法的返回值有误
yii\db\ActiveRecord::beforeValidate():
yii\db\ActiveRecord::afterValidate()
yii\db\ActiveRecord::beforeSave()
yii\db\ActiveRecord::afterSave()