How can you include column headers when exporting Eloquent to Excel in Laravel?

I am trying to allow users to download Excel, using Laravel Excel files with product information. My current web route looks like this:

Route::get('/excel/release', 'ExcelController@create')->name('Create Excel');

My current Export looks like this:

class ProductExport implements FromQuery
{
    use Exportable;

    public function __construct(int $id)
    {
        $this->id = $id;
    }

    public function query()
    {
        return ProductList::query()->where('id', $this->id);
    }
}

My current controller looks like this:

public function create(Request $request) {

    # Only alowed tables
    $alias = [
        'product_list' => ProductExport::class
    ];

    # Ensure request has properties
    if(!$request->has('alias') || !$request->has('id'))
        return Redirect::back()->withErrors(['Please fill in the required fields.'])->withInput();

    # Ensure they can use this
    if(!in_array($request->alias, array_keys($alias)))
        return Redirect::back()->withErrors(['Alias ' . $request->alias . ' is not supported'])->withInput();

    # Download
    return (new ProductExport((int) $request->id))->download('iezon_solutions_' . $request->alias . '_' . $request->id . '.xlsx');
}

When I head over to https://example.com/excel/release?alias=product_list&id=1 this executes correctly and returns an excel file. However, there is no column headers for the rows. The data comes out like so:

1   150 1   3       2019-01-16 16:37:25 2019-01-16 16:37:25     10

However, this should contain column headers like ID, cost etc... How can I include the column headers in this output?

Solution

According to documentation you can change your class to use the WithHeadings interface, and then define the headings function to return an array of column headers:

<?php
namespace App;

use Maatwebsite\Excel\Concerns\FromQuery;
use Maatwebsite\Excel\Concerns\WithHeadings;

class ProductExport implements FromQuery, WithHeadings
{
    use Exportable;

    public function __construct(int $id)
    {
        $this->id = $id;
    }

    public function query()
    {
        return ProductList::query()->where('id', $this->id);
    }

    public function headings(): array
    {
        return ["your", "headings", "here"];
    }
}

This works with all export types (FromQuery, FromCollection, etc.)