workHour/app/Model/WorkFlowInstances.php

<?php

namespace App\Model;

use Illuminate\Database\Eloquent\Model;

//流程实例表
class WorkFlowInstances extends DataScopeBaseModel
{
    protected $guarded = [];
    protected $table = "workflow_instances"; //指定表
    const CREATED_AT = 'crt_time';
    const UPDATED_AT = 'upd_time';
    protected $dateFormat = 'U';
    public static $field = ['id', 'template_id', 'document_id', 'document_type', 'status', 'crt_id', 'crt_time', 'upd_time'];

    const status_one = 'pending';
    const status_two = 'processing';
    const status_three = 'approved';
    const status_four = 'rejected';

    /**
     * 定义与模板表的关联
     */
    public function template()
    {
        // 参数1：关联的模型类名
        // 参数2：当前表（instances）中用来关联的字段名
        // 参数3：目标表（templates）的主键名
        return $this->belongsTo(WorkFlowTemplates::class, 'template_id', 'id');
    }
}