Yii2中查询的更改限制

Question

我想用Yii2创建searchModel，我的查询的默认限制是7，我在页面上有一个输入下拉列表，可在7到30之间切换查询限制。我该怎么做？

Answer 1

您可以将SearchModel定义为：

<?php

namespace app\models\search;

use yii\base\Model;
use yii\data\ActiveDataProvider;
use app\models\Human;

/**
 * Class HumanSearch
 *
 * @package app\models\search
 */
class HumanSearch extends Model
{
    /**
     * @var int $limit
     */
    public $limit;

    /**
     * @return array
     */
    public function rules(): array
    {
        return [
            [['limit'], 'integer', 'min' => 7, 'max' => 30], // Limit can be between 7 and 30.
            [['limit'], 'default', 'value' => 7], // Default query limit is 7 rows.
        ];
    }

    /**
     * @param array $params
     *
     * @return ActiveDataProvider
     */
    public function search(array $params): ActiveDataProvider
    {
        // Initialize query.
        $query = Human::find();
        $dataProvider = new ActiveDataProvider([
            'query' => $query,
        ]);

        // Load additional params to search model.
        if (!$this->load($params) && $this->validate()) {
            return $dataProvider;
        }

        // Set query limit.
        $query->limit($this->limit);

        return  $dataProvider;
    }
}

然后在
Controller中的actionIndex()中使用它：
<?php

namespace app\controllers;

use Yii;
use yii\rest\Controller;
use yii\data\ActiveDataProvider;
use app\models\search\HumanSearch;

class HumanController extends Controller
{
    public function actionIndex(): ActiveDataProvider
    {
        $params = Yii::$app->getRequest()->getQueryParams();
        $search = new HumanSearch;

        return $search->search($params);
    }
}