如何验证上传文件中的名称是否重复？

Question

如果上传文件中的名称字段重复，如何显示验证消息？

<?php

namespace App\Imports;
use App\Models\Customer;
use Illuminate\Support\Collection;
use Maatwebsite\Excel\Concerns\ToCollection;
use Maatwebsite\Excel\Concerns\WithHeadingRow;
use Maatwebsite\Excel\Concerns\WithValidation;

class CustomerImport implements ToCollection, WithHeadingRow, WithValidation
{
    public $timestamps = false;
   

    public function collection(Collection $rows)
    {
        foreach ($rows as $row) {
            
            Customer::create([
                'name'     => $row['name'],
                'address'  => $row['address'],
            ]);
             
        }
    }

    public function rules(): array
    {
        return [
            'name'      => [
                'required',
                'max:50',
                'unique:customers,name',
            ],
            'address'      => [
                'required',
                'max:50',
                'unique:customers,address',
            ]
        
        ];
    }
}

我上传的 csv 文件示例如下：名称“AAA”重复。所以我需要为文件中的重复条目显示验证错误消息。

姓名、地址

AAA,测试地址

AAA,testaddress1

BBB,地址2

现在我得到 Illuminate\Database\QueryException SQLSTATE[23000]：违反完整性约束：1062 Duplicate entry 'AAA' 错误。

我的控制器代码如下：

public function uploadFile(Request $request)
{
        $request->validate(
            ['file' => ['required', 'file', 'mimes:txt,csv']],
            ['file.required' => 'Please upload the file']
        );
        try {
            Excel::import(new CustomerImport(), $request->file('file'));
        } catch (\Maatwebsite\Excel\Validators\ValidationException $e) {
            $failures = $e->failures();
            return redirect()
                ->route('customers.upload')
                ->withErrors($failures);
        }
        return redirect()
            ->route('customers.index')
            ->with('success', __('customers.message_uploaded'));
    }

Answer 1

您可以通过创建自定义验证规则来实现此目的。使用Maatwebsite 库的示例实现可以是：

文件：app\Rules\CsvUnique.php

namespace App\Rules;

use App\Imports\CustomerImport;
use Illuminate\Contracts\Validation\Rule;
use Maatwebsite\Excel\Facades\Excel;

class CsvUnique implements Rule
{

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

    public function passes($attribute, $value)
    {
        $data = Excel::toArray(new CustomerImport(), $value);

        $names = array_map(function($i) {
            return $i[0];
        }, array_slice($data[0],1));

        return count($names) === count(array_unique($names));
    }

    public function message()
    {
        return 'The :attribute has already been taken.';
    }
}

然后你可以像这样在你的验证逻辑中使用它：

$request->validate(
    ['file' => ['required', 'file', 'mimes:txt,csv', new CsvUnique('name')]],
    ['file.required' => 'Please upload the file']
);

注意我们将列名（在此示例中为 name）传递给自定义规则。