如何解决Gridview通过映射表仅获得一个拥有所有设备的用户
我的用户表包含：PK-ID，用户名，密码。
我有三个桌子（笔记本电脑，显示器，电话）-ID-FK，系列，型号
我有userequipmentmapping表，其中包含：id-PK，user_id-FK（来自用户表的id），laptop_id-FK（来自笔记本电脑表的id），phone_id-FK（来自电话表的id），display_id（来自dislpay表的ID） ，开始日期，结束日期。
我已经使用userequipmentmapping表映射了拥有设备的用户，但是在每条记录上我只分配了笔记本电脑/显示器/电话以及开始日期和结束日期。
例如：
id / user_id / laptop_id / phone_id / display_id / start_date / end_date
1/2 / NULL / 1 / NULL / 05.05.2020 / 10.05.2020
2/2/3 / NULL / NULL / 07.05.2020 / 10.05.2020
3/2 / NULL / NULL / 1 / 2.02.2020 / 11.11.2020
我希望能够单行检索user_id所拥有的设备。那可能吗 ？ 感谢您的帮助
[现在，对于上述示例，我得到3行]
控制器：
public function actionIndex()
{
$usermodel = new UserEquipmentMapping();
$userquery = $usermodel->getUsers();
$displaymodel = new UserEquipmentMapping();
$displayquery = $displaymodel->getDisplays();
$phonemodel = new UserEquipmentMapping();
$phonequery = $phonemodel->getPhones();
$laptopmodel = new UserEquipmentMapping();
$laptopquery = $laptopmodel->getLaptops();
#foreach($query as $q)
#print_r($q);
#
#die;
$searchModel = new UserequipmentmappingSearch();
$dataProvider = $searchModel->search(Yii::$app->request->queryParams);
return $this->render('index',[
'searchModel' => $searchModel,'dataProvider' => $dataProvider,'userquery' => $userquery,'displayquery' => $displayquery,'laptopquery'=> $laptopquery,'phonequery'=> $phonequery,]);
}
型号：
<?php
namespace app\models;
use Yii;
use app\models\User;
use app\models\UserQuery;
use yii\db\ActiveQuery;
/**
* This is the model class for table "user_equipment_mapping".
*
* @property int $id
* @property int $user_id
* @property int|null $laptop_id
* @property int|null $phone_id
* @property int|null $display_id
* @property string|null $start_date
* @property string|null $stop_date
*
* @property Display $display
* @property Laptop $laptop
* @property Phone $phone
* @property User $user
*/
class UserEquipmentMapping extends \yii\db\ActiveRecord
{
/**
* {@inheritdoc}
*/
public static function tableName()
{
return 'user_equipment_mapping';
}
/**
* {@inheritdoc}
*/
public function rules()
{
return [
[['user_id'],'required'],[['user_id','laptop_id','phone_id','display_id'],'integer'],[['start_date','stop_date'],'safe'],[['display_id'],'exist','skipOnError' => true,'targetClass' => Display::className(),'targetAttribute' => ['display_id' => 'id']],[['laptop_id'],'targetClass' => Laptop::className(),'targetAttribute' => ['laptop_id' => 'id']],[['phone_id'],'targetClass' => Phone::className(),'targetAttribute' => ['phone_id' => 'id']],[['user_id'],'targetClass' => User::className(),'targetAttribute' => ['user_id' => 'id']],];
}
/**
* {@inheritdoc}
*/
public function attributeLabels()
{
return [
'id' => 'ID','user_id' => 'User ID','laptop_id' => 'Laptop ID','phone_id' => 'Phone ID','display_id' => 'Display ID','start_date' => 'Start Date','stop_date' => 'Stop Date',];
}
/**
* Gets query for [[Display]].
*
* @return \yii\db\ActiveQuery|DisplayQuery
*/
public function getDisplay()
{
return $this->hasOne(Display::className(),['id' => 'display_id']);
}
/**
* Gets query for [[Laptop]].
*
* @return \yii\db\ActiveQuery|LaptopQuery
*/
public function getLaptop()
{
return $this->hasOne(Laptop::className(),['id' => 'laptop_id']);
}
/**
* Gets query for [[Phone]].
*
* @return \yii\db\ActiveQuery|PhoneQuery
*/
public function getPhone()
{
return $this->hasOne(Phone::className(),['id' => 'phone_id']);
}
/**
* Gets query for [[User]].
*
* @return \yii\db\ActiveQuery|UserQuery
*/
public function getUser()
{
return $this->hasOne(User::className(),['id' => 'user_id']);
}
public function getUsers()
{
return $this->hasMany(User::className(),['user_id','id']);
}
public function getLaptops()
{
return $this->hasMany(Laptop::className(),['laptop_id','id']);
}
public function getDisplays()
{
return $this->hasMany(Display::className(),['dislpay_id','id']);
}
public function getPhones()
{
return $this->hasMany(Phone::className(),['phone_id','id']);
}
/**
* {@inheritdoc}
* @return UserEquipmentMappingQuery the active query used by this AR class.
*/
public static function find()
{
return new UserEquipmentMappingQuery(get_called_class());
}
}
查看：
<?php
use yii\helpers\Html;
use yii\grid\GridView;
/* @var $this yii\web\View */
/* @var $searchModel app\models\UserequipmentmappingSearch */
/* @var $dataProvider yii\data\ActiveDataProvider */
$this->title = 'User Equipment Mappings';
$this->params['breadcrumbs'][] = $this->title;
?>
<div class="user-equipment-mapping-index">
<h1><?= Html::encode($this->title) ?></h1>
<p>
<?= Html::a('Create User Equipment Mapping',['create'],['class' => 'btn btn-success']) ?>
</p>
<?php // echo $this->render('_search',['model' => $searchModel]); ?>
<?= GridView::widget([
'dataProvider' => $dataProvider,'filterModel' => $searchModel,'formatter' => [
'class' => 'yii\i18n\Formatter','nullDisplay' => '-',],'columns' => [
#['class' => 'yii\grid\SerialColumn'],#'id',#'user.username',['attribute' => 'user','label' => 'Username','value' => 'user.username'
#},#'laptop.laptop_model',['attribute' => 'laptop','label' => 'Laptop Series','value' => 'laptop.laptop_series'
#},#'laptop_id',#'phone.phone_model',['attribute' => 'phone','label' => 'Phone Series','value' => 'phone.phone_series'
#},#'phone_id',#'display.display_model',['attribute' => 'display','label' => 'Display Series','value' => 'display.display_series'
#},#'display_id','start_date','stop_date',['class' => 'yii\grid\ActionColumn','header' => "Actions"],]); ?>
</div>
解决方法
从SQL前景来看，可能是这样：
SELECT user_id,start_date,end_date,laptop_id as value FROM userequipmentmapping WHERE user_id = 2 and value IS NOT NULL
UNION ALL SELECT user_id,phone_id as value FROM userequipmentmapping WHERE user_id = 2 and value IS NOT NULL
UNION ALL SELECT user_id,display_id as value FROM userequipmentmapping WHERE user_id = 2 and value IS NOT NULL
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