bot-28/app/Models/RechargeChannelGroup.php

<?php

namespace App\Models;

class RechargeChannelGroup extends BaseModel
{

    protected $table = 'recharge_channel_group';
    protected $fillable = ['name', 'channel_ids'];
    protected $hidden = [];

    public function getChannelIdsAttribute($value)
    {
        return $value ? explode(',', $value) : []; 
    }

    public function rechargeChannel()
    {
        return $this->hasMany(RechargeChannel::class, 'channel_ids', 'id');
    }
}