[Laravel-Excel中文文档] maatwebsite/excel导出多个Sheet

为了允许导出有多个工作表，WithMultipleSheets应该使用关注点。该sheets()方法需要返回一个工作表导出对象数组。

namespace App\Exports;

use Maatwebsite\Excel\Concerns\Exportable;
use Maatwebsite\Excel\Concerns\WithMultipleSheets;

class InvoicesExport implements WithMultipleSheets
{
    use Exportable;

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

    /**
     * @return array
     */
    public function sheets(): array
    {
        $sheets = [];

        for ($month = 1; $month <= 12; $month++) {
            $sheets[] = new InvoicesPerMonthSheet($this->year, $month);
        }

        return $sheets;
    }
}

工作表类

InvoicesPerMonthSheet可以实现诸如FromQuery, FromCollection, ...之类的问题

namespace App\Exports\Sheets;

use Maatwebsite\Excel\Concerns\FromQuery;
use Maatwebsite\Excel\Concerns\WithTitle;

class InvoicesPerMonthSheet implements FromQuery, WithTitle
{
    private $month;
    private $year;

    public function __construct(int $year, int $month)
    {
        $this->month = $month;
        $this->year  = $year;
    }

    /**
     * @return Builder
     */
    public function query()
    {
        return Invoice
            ::query()
            ->whereYear('created_at', $this->year)
            ->whereMonth('created_at', $this->month);
    }

    /**
     * @return string
     */
    public function title(): string
    {
        return 'Month ' . $this->month;
    }
}

这将下载当年所有发票的 xlsx，其中 12 个工作表代表一年中的每个月。

public function download() 
{
    return (new InvoicesExport(2018))->download('invoices.xlsx');
}