Yii2 多对多模型关系

Question

我在两个 yii2 模型之间实现了多对多关系： slider, images, sliders_images 其中 sliders_images 是连接点 table。每个模型都扩展了一个由Gii生成的基础模型，所以当我需要的时候我可以覆盖基础模型而不丢失个人方法。
Slider.php

...
public function getImages(){
    return $this->hasMany(Images::className(), ['id' => 'image_id'])
        ->viaTable('sliders_images', ['slider_id' => 'id']);
}
...

Images.php

...
public function getSlider(){
     return $this->hasMany(Slider::className(), ['slider_id' => 'id'])
        ->viaTable('sliders_images', ['image_id' => 'id']);
}
...

滑块Images.php

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

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

当我使用函数 link() 来填充结点 table 以创建滑块时一切正常，但是当我尝试从滑块 ActiveRecord 对象获取图像时出现问题 (Yii2 documentation):

public function actionView($id)
{
    $slider = $this->findModel($id);
    return $this->render('view', [
        'model' => $slider,
        'images' => $slider->images
    ]);
}

protected function findModel($id)
{
    if (($model = Slider::findOne($id)) !== null) {
        return $model;
    } else {
        throw new NotFoundHttpException('The requested page does not exist.');
    }
}

如果我在视图中调试 $images 变量，则该变量为空且不包含相关图像。我如何设置模型以在关系中获得正确的访问权限？

编辑：
当我尝试访问 slidersImage 以获取 juncyion 的行时 table:$slider->sliderImage 工作正常，错过了图像行的访问。

滑块table

id | nome         |  descrizione | active
-------------------------------------------
28 | adfjkhbfvòja | JAFNHÒDF     | 1

sliders_imagestable

slider_id | image_id | display_order|
--------------------------------------
28        | 16       | 3            |
--------------------------------------
28        | 17       | 5            |

图片 table

id | date                | url     |
------------------------------------
16 | 2016-06-21 16:21:04 | img/url |
------------------------------------
17 | 2016-06-21 16:22:37 | img/url |

编辑2：

来自调试器的数据库序列：


    1   11:27:02.666    0.7 ms  SHOW    SHOW FULL COLUMNS FROM `admin`
    /var/www/html/yii_advance/backend/models/Admin.php (65)
-------------------------------------------------------------------------
    2   11:27:02.668    0.6 ms  SHOW    SHOW FULL COLUMNS FROM `slider`
    /var/www/html/yii_advance/common/modules/sliders/controllers/SliderController.php (173)
    /var/www/html/yii_advance/common/modules/sliders/controllers/SliderController.php (79)
--------------------------------------------------------------------------
    3   11:27:02.665    0.6 ms  SELECT  SELECT * FROM `admin` WHERE (`id`=2) AND (`status`=10)
    /var/www/html/yii_advance/backend/models/Admin.php (65)
    [+] Explain
--------------------------------------------------------------------------
    4   11:27:02.667    0.5 ms  SELECT  SELECT
        kcu.constraint_name,
        kcu.column_name,
        kcu.referenced_table_name,
        kcu.referenced_column_name
    FROM information_schema.referential_constraints AS rc
    JOIN information_schema.key_column_usage AS kcu ON
        (
            kcu.constraint_catalog = rc.constraint_catalog OR
            (kcu.constraint_catalog IS NULL AND rc.constraint_catalog IS NULL)
        ) AND
        kcu.constraint_schema = rc.constraint_schema AND
        kcu.constraint_name = rc.constraint_name
    WHERE rc.constraint_schema = database() AND kcu.table_schema = database()
    AND rc.table_name = 'admin' AND kcu.table_name = 'admin'
    /var/www/html/yii_advance/backend/models/Admin.php (65)
    [+] Explain
--------------------------------------------------------------------------
    5   11:27:02.669    0.5 ms  SELECT  SELECT
        kcu.constraint_name,
        kcu.column_name,
        kcu.referenced_table_name,
        kcu.referenced_column_name
    FROM information_schema.referential_constraints AS rc
    JOIN information_schema.key_column_usage AS kcu ON
        (
            kcu.constraint_catalog = rc.constraint_catalog OR
            (kcu.constraint_catalog IS NULL AND rc.constraint_catalog IS NULL)
        ) AND
        kcu.constraint_schema = rc.constraint_schema AND
        kcu.constraint_name = rc.constraint_name
    WHERE rc.constraint_schema = database() AND kcu.table_schema = database()
    AND rc.table_name = 'slider' AND kcu.table_name = 'slider'
    /var/www/html/yii_advance/common/modules/sliders/controllers/SliderController.php (173)
    /var/www/html/yii_advance/common/modules/sliders/controllers/SliderController.php (79)
    [+] Explain
--------------------------------------------------------------------------
    6   11:27:02.669    0.4 ms  SELECT  SELECT * FROM `slider` WHERE `id`='28'
    /var/www/html/yii_advance/common/modules/sliders/controllers/SliderController.php (173)
    /var/www/html/yii_advance/common/modules/sliders/controllers/SliderController.php (79)

Answer 1

这个 public $images; 属性应该重命名，因为它与关系的名称重合 getImages()

class Slider extends Sl
{
    const SCENARIO_CREATE = 'create';
    const SCENARIO_VIEW = 'view';
    const SCENARIO_UPDATE = 'update';

    public $images; // This should be renamed
    ...

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