exchange/app/Booking.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Booking extends Model
{
    // protected $guarded = [];
    protected $hidden = array('user_id',  
                                "rate_id",
                                "rmb_book_amount",
                                "rmb_book_pay_method",
                                "rmb_book_account_name",
                                "rmb_book_bank_name",
                                "rmb_book_acc_no",
                                "rmb_book_bank_branch",
                                "usd_book_amount",
                                "usd_book_pay_method",
                                "usd_book_company_name",
                                "usd_book_company_address",
                                "usd_book_swift_code",
                                "usd_book_cnap",
                                "usd_book_bank_branch");

    protected $fillable = ['term', 'rate_id', 'user_id', 'amount', 'account_name', 'account_num', 'bank_name', 
                            'bank_branch', 'company_name'];
                            
    public $timestamps = true;
    
    public function user(){
        return $this->belongsTo('app\User');
    }

    public function bookingSupplier(){
        return $this->belongsTo('app\BookingSupplier ');
    }

    public function chinaBankSlip(){
        return $this->hasOne(ChinaBankSlip::class);
    }
    
    public function userBankSlip(){
        return $this->hasOne(UserBankSlip::class);
    }

    public function purchaseOrder(){
        return $this->hasOne(PurchaseOrder::class);
    }
}