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 是联结表。 每个模型都扩展了 Gii 生成的基本模型，所以当我需要时，我可以覆盖基本模型而不会丢失个人方法。
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']);
}
...

SlidersImages.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() 在创建滑块时填充连接表时，一切正常，但是当我尝试从滑块 ActiveRecord 对象 (Yii2 documentation) 获取图像时出现问题：

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，这是 null 并且不包含相关图像。 我如何设置模型以获得关系的正确访问权限？

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

滑块表

编号 |名称 |描述 |积极的 ------------------------------------------ 28 | adfjkhbfvòja | JAFNHÒDF | 1

sliders_images 表

滑块 ID | image_id |显示顺序| -------------------------------------- 28 | 16 | 3 | -------------------------------------- 28 | 17 | 5 |

图片表

编号 |日期 |网址 | ---------------------------------- 16 | 2016-06-21 16:21:04 |图片/网址 | ---------------------------------- 17 | 2016-06-21 16:22:37 |图片/网址 |

编辑2：

来自调试器的数据库序列：

1 11:27:02.666 0.7 ms 显示来自 `admin` 的完整列 /var/www/html/yii_advance/backend/models/Admin.php (65) -------------------------------------------------- ---------------------- 2 11:27:02.668 0.6 ms 显示“滑块”中的完整列 /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) [+] 解释 -------------------------------------------------- ---------------------- 4 11:27:02.667 0.5 毫秒选择选择 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 或 （kcu.constraint_catalog 为空且 rc.constraint_catalog 为空） ） 和 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) [+] 解释 -------------------------------------------------- ---------------------- 5 11:27:02.669 0.5 毫秒选择选择 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 或 （kcu.constraint_catalog 为空且 rc.constraint_catalog 为空） ） 和 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) [+] 解释 -------------------------------------------------- ---------------------- 6 11:27:02.669 0.4 毫秒 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，因为它与关系名称getImages()一致

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

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