YII2. "Bad Request (#400) Missing required parameters", how to fix?

Question

Yii

I get this error if I want to click on the "set category or tag or image" button from the post creation page:

This is what the post creation page looks like.

If I click on the same buttons from the view or update page, everything works fine. Where do I lose this id????
articlecontroller.php

<?php
namespace app\modules\admin\controllers;
use app\models\Category;
use app\models\ImageUpload;
use app\models\Tag;
use Yii;
use app\models\Article;
use app\models\ArticleSearch;
use yii\helpers\ArrayHelper;
use yii\web\Controller;
use yii\web\NotFoundHttpException;
use yii\filters\VerbFilter;
use yii\web\UploadedFile;
use yii\helpers\Url;

/**
 * ArticleController implements the CRUD actions for Article model.
 */
class ArticleController extends Controller
{
    /**
     * @inheritdoc
     */
    public function behaviors()
    {
        return [
            'verbs' => [
                'class' => VerbFilter::className(),
                'actions' => [
                    'delete' => ['POST'],
                ],
            ],
        ];
    }

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

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

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

    /**
     * Creates a new Article model.
     * If creation is successful, the browser will be redirected to the 'view' page.
     * @return mixed
     */
    public function actionCreate()
    {
        $model = new Article();

        if ($model->load(Yii::$app->request->post()) && $model->save()) {
            return $this->redirect(['view', 'id' => $model->id]);
        } else {
            return $this->render('create', [
                'model' => $model,
            ]);
        }
    }

    /**
     * Updates an existing Article 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);

        if ($model->load(Yii::$app->request->post()) && $model->save()) {
            return $this->redirect(['view', 'id' => $model->id]);
        } else {
            return $this->render('update', [
                'model' => $model,
            ]);
        }
    }

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

    public function actionSetImage($id)
    {
        $model = new ImageUpload;

        if (Yii::$app->request->isPost)
        {
            $article = $this->findModel($id);
            $file = UploadedFile::getInstance($model, 'image');
            if($article->saveImage($model->uploadFile($file, $article->image)))
                
            {
                $url = Url::previous();
                return $this->redirect($url);
            }
        }
        
        return $this->render('image', ['model'=>$model]);
    }
    
    public function actionSetCategory($id)
    {
        $article = $this->findModel($id);
        $selectedCategory = ($article->category) ? $article->category->id : '0';
        $categories = ArrayHelper::map(Category::find()->all(), 'id', 'title');

        if(Yii::$app->request->isPost)
        {
            $category = Yii::$app->request->post('category');
            if($article->saveCategory($category)) 
            {
                $url = Url::previous();
                return $this->redirect($url);
            }
        }
        return $this->render('category', [
            'article'=>$article,
            'selectedCategory'=>$selectedCategory,
            'categories'=>$categories
        ]);
    }
    
    public function actionSetTags($id)
    {
        $article = $this->findModel($id);
        $selectedTags = $article->getSelectedTags(); 
        $tags = ArrayHelper::map(Tag::find()->all(), 'id', 'title');

        if(Yii::$app->request->isPost)
        {
            $tags = Yii::$app->request->post('tags');
            $article->saveTags($tags);
            $url = Url::previous();
            return $this->redirect($url);
        }
       
        return $this->render('tags', [
            'selectedTags'=>$selectedTags,
            'tags'=>$tags
        ]);
    }
}

_form.php

<?php

use yii\helpers\Html;
use yii\widgets\ActiveForm;
use yii\helpers\Url;
?>

<div class="article-form">
    
    <?php $form = ActiveForm::begin(); ?>

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

    <?= $form->field($model, 'description')->textarea(['rows' => 6]) ?>

    <?= $form->field($model, 'content')->textarea(['rows' => 6]) ?>

    <?= $form->field($model, 'date')->textInput() ?>

    <?= Html::hiddenInput('url', Yii::$app->request->referrer)?> 
    
    <?= Html::a('Добавить изображение', ['set-image', 'id' => $model->id], ['class' => 'btn btn-default']) ?>
    <?= Html::a('Установить категорию', ['set-category', 'id' => $model->id], ['class' => 'btn btn-default']) ?>
    <?= Html::a('Установить тэги', ['set-tags', 'id' => $model->id], ['class' => 'btn btn-default']) ?>
    
    <div class="form-group">
       <br>
        <?= Html::submitButton($model->isNewRecord ? 'Создать' : 'Изменить', ['class' => $model->isNewRecord ? 'btn btn-success' : 'btn btn-primary']) ?>
    </div>
    <?php ActiveForm::end(); ?>
</div>

create.php

<?php

use yii\helpers\Html;
use yii\helpers\Url;
$this->title = 'Добавить запись';
$this->params['breadcrumbs'][] = ['label' => 'Articles', 'url' => ['index']];
$this->params['breadcrumbs'][] = $this->title;
Url::remember();
?>
<div class="article-create">

    <h1><?= Html::encode($this->title) ?></h1>

    <?= $this->render('_form', [
        'model' => $model,
    ]) ?>
</div>

view.php

<?php
use yii\helpers\Html;
use yii\widgets\DetailView;
use yii\helpers\Url;
$this->title = $model->title;
$this->params['breadcrumbs'][] = ['label' => 'Записи', 'url' => ['index']];
$this->params['breadcrumbs'][] = $this->title;
Url::remember();
?>
<div class="article-view">
    <h1><?= Html::encode($this->title) ?></h1>
    <p>
        <?= Html::a('Изменить', ['update', 'id' => $model->id], ['class' => 'btn btn-primary']) ?>
        <?= Html::a('Удалить', ['delete', 'id' => $model->id], [
            'class' => 'btn btn-danger',
            'data' => [
                'confirm' => 'Вы уверены, что хотите удалить запись?',
                'method' => 'post',
            ],
        ]) ?>
        <?= Html::a('Добавить изображение', ['set-image', 'id' => $model->id], ['class' => 'btn btn-default']) ?>
        <?= Html::a('Установить категорию', ['set-category', 'id' => $model->id], ['class' => 'btn btn-default']) ?>
        <?= Html::a('Установить тэги', ['set-tags', 'id' => $model->id], ['class' => 'btn btn-default']) ?>
    </p>

    <?= DetailView::widget([
        'model' => $model,
        'attributes' => [
            'id',
            'title',
            'description:ntext',
            'content:ntext',
            'date',
            'image',
            'viewed',
            'user_id',
            'status',
            'category_id',
        ],
    ]) ?>
</div>

Answer 1

How do you imagine linking categories or tags to a post that hasn't been created yet?