问题描述
我在使用 laravel faker 时遇到一个问题,我正在寻找使用播种机插入数千条记录的教程
这是我的 PostSeeder.PHP:
<?PHP
namespace Database\Seeders;
use Illuminate\Database\Seeder;
use App\Models\Post;
use App\Models\User;
class PostSeeder extends Seeder
{
/**
* Run the database seeds.
*
* @return void
*/
public function run()
{
Post::factory(10)->create();
}
}
这里我插入了10个帖子,但我需要测试数千或数百万条记录,所以看了一个教程并修改了播种机
<?PHP
namespace Database\Seeders;
use Illuminate\Database\Seeder;
use App\Models\Post;
use App\Models\User;
use Illuminate\Support\Str;
class PostSeeder extends Seeder
{
/**
* Run the database seeds.
*
* @return void
*/
public function run()
{
$users= collect(User::all()->modelKeys());
$data = [];
for ($i = 0; $i < 100000; $i++) {
$data[] = [
'body' => Str::random(50),'image' => 'https://via.placeholder.com/640x480.png/0077dd?text=inventore','user_id' => $users->random(),'created_at' => Now()->toDateTimeString(),'updated_at' => Now()->toDateTimeString(),];
}
$chunks = array_chunk($data,10000);
foreach ($chunks as $chunk) {
Post::insert($chunk);
}
}
}
使用这种方法我可以更快地插入数千条记录,但问题是我没有正确插入正文和图像字段
我想用 faker 尝试一些东西,在我的工厂我有这个:
PostFactory.PHP
<?PHP
namespace Database\Factories;
use App\Models\Post;
use App\Models\User;
use Illuminate\Database\Eloquent\Factories\Factory;
class PostFactory extends Factory
{
/**
* The name of the factory's corresponding model.
*
* @var string
*/
protected $model = Post::class;
/**
* Define the model's default state.
*
* @return array
*/
public function deFinition()
{
return [
'body' => $this->faker->text,'image' => $this->faker->imageUrl(),'user_id' => function() {
return User::factory()->create()->id;
}
];
}
}
我想在 PostSeeder 中使用像这些这样的伪造方法,但我不能,我该怎么办?谢谢。
编辑:
我试过了:
public function run(Faker $faker)
{
$users= collect(User::all()->modelKeys());
$data = [];
for ($i = 0; $i < 50000; $i++) {
$data[] = [
'content' => $faker->text,'image_path' => $faker->imageUrl(),5000);
foreach ($chunks as $chunk) {
Post::insert($chunk);
}
}
我收到了这条消息: PDOException::("sqlSTATE[HY000]: 一般错误:2006 MysqL 服务器已经消失") 但是当我尝试使用较少的记录时它会起作用,因此,我像这样更改了播种机:
$users= collect(User::all()->modelKeys());
$posts = Post::factory(10)->create();
$posts = collect($posts->only(['content','image_path']));
...
...
'content' => $posts->random()->content,'image_path' => $posts->random()->image_path
...
这不起作用,它得到了这个错误: 您请求了 1 个项目,但只有 0 个项目可用。 看起来 $posts->only(['content','image_path']) 工作不正常。所以我尝试了这个:
Post::factory(10)->create();
$tweets = Tweet::select(['content','image_path'])->get();
...
'content' => $posts->random()->content,'image_path' => $posts->random()->image_path
...
它再次处理一些记录,但是当我尝试处理数千条记录时,我再次收到此错误: PDOException::("sqlSTATE[HY000]: 一般错误:2006 MysqL 服务器已经消失")
我能做什么?谢谢
解决方法
由于模型工厂在内存中创建对象,因此内存使用量大,不适合大种子。
但是您可以使用 Faker
来生成数据:
use Faker\Generator as Faker;
class PostSeeder extends Seeder
{
public function run(Faker $faker)
{
$users= collect(User::all()->modelKeys());
$data = [];
for ($i = 0; $i < 100000; $i++) {
$data[] = [
'body' => $faker->text,'image' => $faker->imageUrl(),'user_id' => $users->random(),'created_at' => now()->toDateTimeString(),'updated_at' => now()->toDateTimeString(),];
}
$chunks = array_chunk($data,10000);
foreach ($chunks as $chunk) {
Post::insert($chunk);
}
}
}