Question

我在ActiveController中有自定义操作，需要通过连接两个表来获取一些数据。我写了以下查询。

$query = Item::find()->joinWith(['subcategory'])->select(['item.*', 'sub_category.name'])->where(['item.active' => 1])->addOrderBy(['item.id' => SORT_DESC]);

    $pageSize = (isset($_GET["limit"]) ? $_GET["limit"] : 1) * 10;
    $page = isset($_GET["page"]) ? $_GET["page"] : 1;
    $dataProvider = new ActiveDataProvider(['query' => $query, 'pagination' => ['pageSize' => $pageSize, "page" => $page]]);
    $formatter = new ResponseFormatter();
    return $formatter->formatResponse("", $dataProvider->getTotalCount(), $dataProvider->getModels());

但它正在抛出异常

"message": "Setting unknown property: common\\models\\Item::name",

这是包含所有字段和关系的项目模型。

    <?php

namespace common\models;

use Yii;
use yii\behaviors\TimestampBehavior;
use yii\db\BaseActiveRecord;
use yii\db\Expression;

/**
 * This is the model class for table "item".
 *
 * @property integer $id
 * @property integer $subcategory_id
 * @property string $title
 * @property resource $description
 * @property integer $created_by
 * @property integer $updated_by
 * @property string $created_at
 * @property string $updated_at
 * @property string $image
 * @property integer $active
 *
 * @property SubCategory $subcategory
 */
class Item extends \yii\db\ActiveRecord
{
    public $imageFile;

    /**
     * @inheritdoc
     */
    public static function tableName()
    {
        return 'item';
    }

    /**
     * @inheritdoc
     */
    public function rules()
    {
        return [
            [['created_by', 'updated_by'], 'required'],
            [['subcategory_id', 'created_by', 'updated_by', 'active'], 'integer'],
            [['description'], 'string'],
            [['created_at', 'updated_at'], 'safe'],
            [['title', 'image'], 'string', 'max' => 999],
            [['title'], 'unique'],
            [['imageFile'], 'file', 'skipOnEmpty' => true, 'extensions' => 'png, jpg'],

        ];
    }

    /**
     * @inheritdoc
     */
    public function attributeLabels()
    {
        return [
            'id' => 'ID',
            'subcategory_id' => 'Subcategory ID',
            'title' => 'Title',
            'description' => 'Description',
            'created_by' => 'Created By',
            'updated_by' => 'Updated By',
            'created_at' => 'Created At',
            'updated_at' => 'Updated At',
            'image' => 'Image',
            'active' => 'Active',
            'imageFile' => 'Image',
        ];
    }


    /**
     * @return \yii\db\ActiveQuery
     */
    public function getSubcategory()
    {
        return $this->hasOne(SubCategory::className(), ['id' => 'subcategory_id']);
    }

    /**
     * @return \yii\db\ActiveQuery
     */
    public function getCreatedBy()
    {
        return $this->hasOne(User::className(), ['id' => 'created_by']);
    }

    /**
     * @return \yii\db\ActiveQuery
     */
    public function getUpdatedBy()
    {
        return $this->hasOne(User::className(), ['id' => 'updated_by']);
    }

    public function behaviors()
    {
        return [
            'timestamp' => [
                'class' => TimestampBehavior::className(),
                'attributes' => [
                    BaseActiveRecord::EVENT_BEFORE_INSERT => ['created_at', 'updated_at'],
                    BaseActiveRecord::EVENT_BEFORE_UPDATE => 'updated_at',
                ],
                'value' => new Expression('NOW()'),
            ],
        ];
    }
}

Answer 1

joinWith使用请求的连接进行查询，但结果数据在源模型中映射（在本例中为Item）。

由于你有select(['item.*', 'sub_category.name'])，框架将尝试填充Item模型的'name'字段，该字段不存在，这会产生错误。

根据文档（http://www.yiiframework.com/doc-2.0/guide-rest-resources.html#overriding-extra-fields），默认情况下，您应该从db填充数据库关系子类别，但我在您的文件中看不到子类别关系模型。

因此，您只需在模型中创建子类别关系，例如：

public function getSubcategory() { return $this->hasOne(Subcategory::className(), ['id' => 'subcategory_id']); }

所以你应该解决你的问题。

使用更多模型的自定义字段的其他解决方案可能是：

1）使用您想要的字段创建一个sql View（并从中创建模型）并将其传递给ActiveDataProvide

2）覆盖模型的extraFields方法（http://www.yiiframework.com/doc-2.0/yii-base-arrayabletrait.html#extraFields%28%29-detail）

再次，我建议你阅读这篇好文章： http://www.yiiframework.com/wiki/834/relational-query-eager-loading-in-yii-2-0/

Yii2使用ActiveDataProvider进行api连接查询

1 个答案: