test/app/Http/Models/BqFlow.php

<?php

namespace App\Http\Models;

use Illuminate\Database\Eloquent\Model;

class BqFlow extends Model
{
    protected $primaryKey = 'id';
    protected $table = 'bq_flow';
    protected $guarded = [];

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