Laravel 找不到播种机

Question

我是运行创建 table 后迁移期间的一些播种者。这是我的迁移文件 create_institutions_table

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

class CreateInstitutionsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('institutions', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->string('name');
            $table->string('code');
            $table->timestamps();
            $table->softDeletes();
        });

        $seeder = new InstitutionsSeeder();
        $seeder->run();

        $seeder2 = new UsersSeeder();
        $seeder2->run();

        Schema::table('users', function (Blueprint $table) {
            $table->foreign('institution_id')->references('id')->on('institutions');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('institutions');
    }
}

这是InstitutionsSeeder

use Illuminate\Database\Seeder;

class InstitutionsSeeder extends Seeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */
    public function run()
    {
        DB::table('institutions')->insert([
            'name' => 'Institution One',
            'code' => 'I1',
        ]);

    }
}

这是UsersSeeder

use Illuminate\Database\Seeder;

class UsersSeeder extends Seeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */
    public function run()
    {
        DB::table('users')->insert([
            'first_name' => 'Admin',
            'last_name' => 'Istrator',
            'email' => 'admin@example.com',
            'institution_id' => '1',
            'password' => 'y$/wYQaaaaaaagrtyh64gbdt4yuhr32l4VmFHI.sINMR/9LXsj1MTy',
        ]);
    }
}

据我所知，播种机之间没有真正的区别，但是在尝试实例化 UsersSeeder class 时迁移失败，而 InstitutionsSeeder 工作正常。这是我从 php artisan migrate:fresh 命令得到的异常：

   Symfony\Component\Debug\Exception\FatalThrowableError  : Class 'UsersSeeder' not found

  at H:\code\MyProject\database\migrations19_06_17_224612_create_institutions_table.php:27
    23| 
    24|                 $seeder = new InstitutionsSeeder();
    25|                 $seeder->run();
    26| 
  > 27|                 $seeder2 = new UsersSeeder();
    28|                 $seeder2->run();
    29| 
    30|                 Schema::table('users', function (Blueprint $table) {
    31|                         $table->foreign('institution_id')->references('id')->on('institutions');

  Exception trace:

  1   CreateInstitutionsTable::up()
      H:\code\MyProject\vendor\laravel\framework\src\Illuminate\Database\Migrations\Migrator.php:379

  2   Illuminate\Database\Migrations\Migrator::Illuminate\Database\Migrations\{closure}()
      H:\code\MyProject\vendor\laravel\framework\src\Illuminate\Database\Migrations\Migrator.php:388

  Please use the argument -v to see more details.

为什么 UsersSeeder 不起作用？

Answer 1

两种可能的解决方案：

检查您的 class
运行作曲家dump-autoload：composer dump-autoload（你可以read the docs这里）

Answer 2

每次创建一个新的播种器运行 composer dump-autoload命令。之后只是运行播种机使用 php artisan db:seed 命令。希望这会奏效！

Laravel 找不到播种机

Laravel Seeder not found

php

laravel

laravel-migrations

laravel-5.8