test/app/Http/Models/FlowStage.php

<?php

namespace App\Http\Models;

use Illuminate\Database\Eloquent\Model;

class FlowStage extends Model
{
    protected $primaryKey = 'id';
    protected $table = 'flow_stage';
    protected $guarded = [];

    public function infoList(){
        return $this->hasMany(FlowInfo::class,'stage_id','id');
    }
}