Complicated array to excel in Laravel

I have two tables which I want to join and create an Excel .

event_invoice

columns

id
name
invoice_value
invoice_date

invoice model

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Invoice extends Model
{
    //
     protected $table = 'event_invoice';
     protected $primaryKey = 'Id';

    /*
     * An invoice can has many payments 
     *
     */

    public function duedates(){
        return $this->hasMany('App\invoiceduedates');
    }

}

invoiceduedate columns

id
invoice_id
date
amountin

duedatemodel

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class invoiceduedates extends Model
{
     protected $table = 'invoiceduedates';


}

So one invoice can have many duedates

I want to display in excel in this format

| name | invoice_value | invoice_date | due date1  | due amount1 | due date2  | due amount2 | due date3  | due amount3 |
|------|---------------|--------------|------------|-------------|------------|-------------|------------|-------------|
| A    | 5000          | 30-01-2016   | 15-01-2016 | 2500        | 30-01-2016 | 04-11-1906  | null       | null        |
| B    | 8000          | 02-05-2016   | 15-02-2016 | 8000        | null       | null        | null       | null        |
| C    | 10000         | 03-05-2016   | 15-05-2016 | 5000        | 19-05-2016 | 2500        | 19-05-2016 | 2500        |

Any help would be appreciated

Thanks

via Chebli Mohamed