雄辩的create方法插入除主键之外的空值

Question

我有一个索引文件，该文件在值数组上调用create方法。 插入数据库的工作，但是，除id以外的所有列都为空。 我在这里很茫然，没有抛出任何错误。任何指导表示赞赏。

index.php

<?php
include_once 'posts.php';

$parameters = array('id' => null, 'title' => 'Title', 'body' => 'Body', 'create_date' => '2019-03-20');

$result = Post::create($parameters);

posts.php

<?php
require 'vendor/autoload.php';

use Illuminate\Database\Capsule\Manager as Capsule;
use \Illuminate\Database\Eloquent\Model;

class Post extends Model {

    public $timestamps = false;
    protected $fillable = ['title', 'body', 'create_date'];

    public function __construct()
    {
        $capsule = new Capsule;
        $capsule->addConnection([
            "driver"    => "mysql",
            "host"      => "localhost",
            "database"  => "db",
            "username"  => "user",
            "password"  => "pass",
            "charset"   => "utf8mb4",
            "collation" => "utf8mb4_unicode_ci",
            "prefix"    => ""
        ]);

        $capsule->bootEloquent();
    }
}

数据库插入