Yii2 Select2-更新-连接表上的选定值（多对多）

我在操作创建时成功地在我的连接表（userlocations）中插入新行，在操作更新时成功地更新了新行，但问题是在操作更新时，location\u id字段始终为空。它应该从userlocations表中检索location\u id，并在更新时填充该字段，但它没有

数据库：

用户控制器：

<?php

namespace backend\controllers;

use Yii;
use backend\models\User;
use backend\models\UserSearch;
use yii\web\Controller;
use yii\web\NotFoundHttpException;
use yii\filters\VerbFilter;
use yii\helpers\ArrayHelper;

use backend\models\Locations;
use backend\models\Userlocations;

class UserController extends Controller
{

public function behaviors()
{
    return [
        'verbs' => [
            'class' => VerbFilter::className(),
            'actions' => [
                'delete' => ['POST'],
            ],
        ],
    ];
}

/**
 * Lists all User models.
 * @return mixed
 */
public function actionIndex()
{
    $searchModel = new UserSearch();
    $dataProvider = $searchModel->search(Yii::$app->request->queryParams);

    return $this->render('index', [
        'searchModel' => $searchModel,
        'dataProvider' => $dataProvider,
    ]);
}

/**
 * Displays a single User model.
 * @param integer $id
 * @return mixed
 */
public function actionView($id)
{
    return $this->render('view', [
        'model' => $this->findModel($id),
    ]);
}

/**
 * Creates a new User model.
 * If creation is successful, the browser will be redirected to the 'view' page.
 * @return mixed
 */
public function actionCreate()
{
    $model = new User();
    $locations = ArrayHelper::map(Locations::find()->all(), 'id', 'name');
    $userlocations = new Userlocations();

    if ($model->load(Yii::$app->request->post()) ) {

        $model->setPassword($model->password);
        $model->generateAuthKey();

        $userlocations->load(Yii::$app->request->post());

        if ($model->save() && !empty($userlocations->location_id)){

            foreach ($userlocations->location_id as $location_id) {
                $userlocations = new Userlocations();
                $userlocations->setAttributes([
                    'location_id' => $location_id,
                    'user_id' => $model->id,
                ]);
                $userlocations->save();
            }
        }

        return $this->redirect(['user/index']);
    } else {
        return $this->render('create', [
            'model' => $model,
            'locations' => $locations,
            'userlocations' => $userlocations,
        ]);
    }
}

/**
 * Updates an existing User model.
 * If update is successful, the browser will be redirected to the 'view' page.
 * @param integer $id
 * @return mixed
 */
public function actionUpdate($id)
{
    $model = $this->findModel($id);
    $locations = ArrayHelper::map(Locations::find()->all(), 'id', 'name');
    $userlocations = new Userlocations();

    if ($model->load(Yii::$app->request->post()) && $model->save()) {

        Userlocations::deleteAll(['user_id' => $id]);

        $userlocations->load(Yii::$app->request->post());

        if (!empty($userlocations->location_id)){
            foreach ($userlocations->location_id as $location_id) {
                $userlocations = new Userlocations();
                $userlocations->setAttributes([
                    'location_id' => $location_id,
                    'user_id' => $model->id,
                ]);
                $userlocations->save();
            }
        }

        return $this->redirect(['user/index']);
    } else {

        return $this->render('update', [
            'model' => $model,
            'locations' => $locations,
            'userlocations' => $userlocations,
        ]);
    }
}

/**
 * Deletes an existing User model.
 * If deletion is successful, the browser will be redirected to the 'index' page.
 * @param integer $id
 * @return mixed
 */
public function actionDelete($id)
{
    $this->findModel($id)->delete();

    return $this->redirect(['index']);
}

/**
 * Finds the User model based on its primary key value.
 * If the model is not found, a 404 HTTP exception will be thrown.
 * @param integer $id
 * @return User the loaded model
 * @throws NotFoundHttpException if the model cannot be found
 */
protected function findModel($id)
{
    if (($model = User::findOne($id)) !== null) {
        return $model;
    } else {
        throw new NotFoundHttpException('The requested page does not exist.');
    }
}

}

我的表格：

<?php

use yii\helpers\Html;
use yii\widgets\ActiveForm;
use yii\helpers\ArrayHelper;
use kartik\select2\Select2;

use backend\models\Locations;

?>

<div class="user-form">

<?php $form = ActiveForm::begin(); ?>

<?= $form->field($model, 'username')->textInput(['maxlength' => true]) ?>

<?= $form->field($model, 'password')->passwordInput(['maxlength' => true]) ?>

<?= $form->field($model, 'email')->textInput(['maxlength' => true]) ?>

<?= $form->field($userlocations, 'location_id')->widget(Select2::classname(), [
    'data' => ArrayHelper::map(Locations::find()->all(), 'id', 'name'),
    'size' => Select2::MEDIUM,
    'options' => ['placeholder' => 'Select a location ...', 'multiple' => true],
    'pluginOptions' => [
        'allowClear' => true,
    ],
]); ?>

<?= $form->field($model, 'status')->dropDownList(['10' => 'Active', '0' => 'Inactive']) ?>

<div class="form-group">
    <?= Html::submitButton($model->isNewRecord ? 'Create' : 'Update', ['class' => $model->isNewRecord ? 'btn btn-success' : 'btn btn-primary']) ?>
</div>

<?php ActiveForm::end(); ?>

---

对于多位置选择，请使用下面给出的插件代码

 <?= Select2::widget([
        'name' => 'Userlocations[location_id]',
        'value' => $location_ids, // initial value
        'data' => ArrayHelper::map(Locations::find()->all(), 'id', 'name'),
        'options' => ['placeholder' => 'Select your locations...', 'multiple' => true],
        'pluginOptions' => [
            'tags' => true,
            'maximumInputLength' => 10
        ],
    ]); ?>

---

$location_id将是您以前在创建时选择的位置数组。还请记住，当您对多个表进行更改时，确保在事务中执行此操作。

@PurpleHaze能否向我展示您的用户模型。我在用户表中看不到location\u id字段显示发送到服务器的post数据的快照。如果您在多个表中进行更改，您可以使用chrome developer tools中的“网络”选项卡查看您的post数据，总是在一个特定的环境中使用它transaction@KiranMuralee我做了一些小的改变，试图让它工作，但结果是一样的。我还更新了完整的用户模型用户控制器和用户表单。这是我发送给服务器的post数据：谢谢，我会仔细查看的

 <?= Select2::widget([
        'name' => 'Userlocations[location_id]',
        'value' => $location_ids, // initial value
        'data' => ArrayHelper::map(Locations::find()->all(), 'id', 'name'),
        'options' => ['placeholder' => 'Select your locations...', 'multiple' => true],
        'pluginOptions' => [
            'tags' => true,
            'maximumInputLength' => 10
        ],
    ]); ?>