Yii2: How to put null values to the end of an object list when sorting is ascending?

问题

Here is my DataProvider:

$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.

How can I do this?

回答1:

You may add new field in select. And set in IF case like that:

$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'
    ]
]

This works fine - here and here.

来源：https://stackoverflow.com/questions/29071610/yii2-how-to-put-null-values-to-the-end-of-an-object-list-when-sorting-is-ascend