Yii2：升序排序时如何将空值放在对象列表的末尾？

这是我的数据提供者：

$dataProvider = new ActiveDataProvider([
    'query'      => $query,
    'pagination' => ['pageSize' => 50],
    'sort'       => [
        'defaultOrder' => [
            'priority'      => SORT_DESC,
            'date_targeted' => SORT_ASC
        ]
     ]
]);

What I want is to move ("not set") to the end of the results.

我怎样才能做到这一点？

您可以添加新字段select。并设置在IF像这样的情况：

$query->select([
    '*', 
    new \yii\db\Expression('IF(date_targeted IS NULL, 1, 0) AS date_targeted_flag')
]);

And in sort add date_targeted_flag:

'sort' => [
    'defaultOrder' => [
        'date_targeted_flag' => SORT_ASC,
        'priority'           => SORT_DESC,
        'date_targeted'      => SORT_ASC
    ],
    'attributes' => [
        'date_targeted_flag',
        'priority',
        'date_targeted'
    ]
]

这工作正常 -here https://yadi.sk/i/Mvn_ZMctfJJXY and here https://yadi.sk/i/yW7HzKChfJJYF.