workHour/app/Model/CustomFieldValue.php

<?php

namespace App\Model;

use Illuminate\Database\Eloquent\Model;

// 自定义项存储表
class CustomFieldValue extends DataScopeBaseModel
{
    protected $guarded = [];
    protected $table = "custom_field_values"; //指定表
    const CREATED_AT = 'crt_time';
    const UPDATED_AT = 'upd_time';
    protected $dateFormat = 'U';

    const type_one = 1;
    const type_two = 2;
    const type = [
        self::type_one => '文本',
        self::type_two => '附件',
    ];

    public function definition()
    {
        // 即使你不需要它的数据，whereHas 也要靠这个方法生成 SQL 的 JOIN 或 EXISTS
        return $this->belongsTo(CustomFieldDefinitions::class, 'definition_id');
    }
}