Почему не получается сохранить запись?

SQLSTATE[23502]: Not null violation: 7 ERROR: null value in column "id" violates not-null constraint
DETAIL: Failing row contains (null, , , , , , , null, null, null, null, null).
The SQL being executed was: INSERT INTO "blog" ("id", "name", "title", "title_mobile", "url", "body_start", "body_end") VALUES (NULL, '', '', '', '', '', '') RETURNING "id"

public function actionEdit()
    {
        $model = new Blog();
        $post = Yii::$app->request->post();
        $get = Yii::$app->request->get();

       $id = Yii::$app->request->get('id');
        if ($id) {
            $model = Blog::find()->where(['id' => $id])->one();
            if (!$model) {
                return $this->render('index', [
                    'name' => 'Ошибка',
                    'message' => 'Блог не найден',
                ]);
            }
        }
     
        if ($model->load(Yii::$app->request->post())) {
                $model->save();
                $this->redirect(Url::to(['blog/index']));
            } 
   
        return $this->render('edit', [
            'model' => $model,
        ]);
    }

public function rules()
    {
        return [
            [['check_main', 'check_comment', 'check_status', 'id_project', 'type'], 'integer'],
            [['name', 'title', 'title_mobile', 'url', 'body_start', 'body_end'], 'string'],
        ];
    }