（新手求助）AR接收不到表单数据 [ 2.0 版本 ]

use yii\helpers\Html;
use yii\bootstrap\ActiveForm;
use frontend\models\Post;
$this->title = '发帖';
    $this->params['breadcrumbs'][] = $this->title;
<?php $form=ActiveForm::begin([
                'id' => 'post-form',
                'options' => ['class' => 'class_name'],
                'action'=>'index.php?r=index/post',
                'method'=>'post',
            ]); 
?>
<?= $form->field($model,'title')->textInput()->label('标题');?>

            <?= $form->field($model,'content')->textarea(['rows'=>6,'id'=>'editor','class'=>'col-sm-1 col-md-12'])->label('文章');?>

            <div class="form-group">
            <?=  Html::submitButton('提交', [
                'class'=>'btn btn-primary',
                'name' =>'submit-button'])?>
            </div>

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

view

namespace frontend\controllers;

use yii;
use frontend\models\Post;
use yii\web\Controller;

class IndexController extends Controller{
    public function actionIndex(){

//        $model =new Post();
        return $this->render('post',[
                'model' => new Post()
            ]);
    }
    public function actionPost(){

        $model =new Post();

        if(yii::$app->request->post())
        {
            $model->title=yii::$app->request->post('title');
            $model->content=yii::$app->request->post('content');
            $model->save();
            return $this->render('post_success',[
                'model'=>$model
            ]);
        }
        else
        {
            return $this->render('post',[
                'model'=>$model
            ]);
        }
    }
}

controller

namespace frontend\models;

use Yii;


class Post extends \yii\db\ActiveRecord
{

    public $title;
    public $content;

    public static function tableName()
    {
        return 'post';
    }

    public function rules()
    {
        return [
            [['title'], 'required','message' => '标题不能为空.'],
            [['content'],'required','message' => '文章内容不能为空.'],
            [['title'], 'string', 'max' => 50],
            [['content'], 'string', 'max' => 200],
        ];
    }

    public function attributeLabels()
    {
        return [
            'id' => 'ID',
            'title' => 'Title',
            'content' => 'Content',
        ];
    }
}

model

刚接触YII的一个新手