如何在循环迁移表中使用计数器？ （laravel 5.3）

Question

我的代码是这样的：

<?php

use Illuminate\Database\Seeder;
use Illuminate\Database\Eloquent\Model;
use App\Models\Akun;
use App\Models\Master_lookup;

class MasterLookupsTableSeeder extends Seeder
{
    public function run()
    {
        $i=1;
        Akun::all()->each(function($akun) { 
            $masterLookup = new Master_lookup; 
            $masterLookup->id           = $i;
            $masterLookup->parent_id    = NULL;
            $masterLookup->code         = $akun->kdakun;
            $masterLookup->name         = $akun->nmakun;
            $masterLookup->type         = 'akun';
            $masterLookup->information  = json_encode($akun->kdjenbel);
            $masterLookup->save();
            $i++;
        });
    }
}

执行时，存在错误：未定义变量：i

有没有人可以帮助我？

Answer 1

尝试下面给出的一个： 创建类变量并使用它：

<?php

use Illuminate\Database\Seeder;
use Illuminate\Database\Eloquent\Model;
use App\Models\Akun;
use App\Models\Master_lookup;

class MasterLookupsTableSeeder extends Seeder
{
    public $i;
    public function run()
    {
        $this->i = 1;
        Akun::all()->each(function($akun) { 
            $masterLookup = new Master_lookup; 
            $masterLookup->id           = $this->i;
            $masterLookup->parent_id    = NULL;
            $masterLookup->code         = $akun->kdakun;
            $masterLookup->name         = $akun->nmakun;
            $masterLookup->type         = 'akun';
            $masterLookup->information  = json_encode($akun->kdjenbel);
            $masterLookup->save();
            $this->i++;
        });
    }
}

根据我的观点，类变量是解决这个问题的方法。

Answer 2

使用匿名函数时，必须将任何此类变量传递给use语言构造。 你能试试这个：

Akun::all()->each(function($akun) use ($i) { 
        $masterLookup = new Master_lookup; 
        $masterLookup->id           = $i;
        $masterLookup->parent_id    = NULL;
        $masterLookup->code         = $akun->kdakun;
        $masterLookup->name         = $akun->nmakun;
        $masterLookup->type         = 'akun';
        $masterLookup->information  = json_encode($akun->kdjenbel);
        $masterLookup->save();
        $i++;
    });