如何为帖子创建一个工厂，它还在 laravel 中为该帖子的元表输入数据

Question

使用工厂是创建种子数据的一种更简洁的方法。 我可以从另一种 foreach 或 for 循环方法生成结果。但是工厂怎么做呢？

下面是后期工厂页面

<?php

/** @var \Illuminate\Database\Eloquent\Factory $factory */

use App\Post;
use App\MetaData;
use Faker\Factory;

$factory->define(Post::class, function () {
    $faker = Faker\Factory::create('en_IN');
    $w = $faker->unique()->sentence.' '.mt_rand(0,1000);
    $r = [
        'title' => $w,
        'slug' => strtolower(str_replace(' ', '-', $w)),
        'banner' => 'https://source.unsplash.com/random/600x600',
        'content' => $faker->text,
        'views' => mt_rand(0,1000),
        'status' => rand(0,1),
        'creator_id' => mt_rand(0,100),
        'moderator_id' => mt_rand(0,100),
    ];

    $factory->define(MetaData::class, function () {
        return [
            'for' => 'article',
            'record_id' => $r->id,
            'title' => $w,
            'slug' => strtolower(str_replace(' ', '-', $w)),
            'description' => $faker->sentences,
            'banner' => 'https://source.unsplash.com/random/600x600',
            'keywords' => $faker->words,
            'status' => 1,
            'creator_id' => mt_rand(0,100),
            'moderator_id' => mt_rand(0,100),
        ];
    });
    return $r;
});

我想做这样的事情，但最终出现如下错误：

   ErrorException  : Undefined variable: factory

  at /Users/dragonar/Dev/pdp/database/factories/PostFactory.php:23
    19|         'creator_id' => mt_rand(0,100),
    20|         'moderator_id' => mt_rand(0,100),
    21|     ];
    22| 
  > 23|     $factory->define(MetaData::class, function () {
    24|         return [
    25|             'for' => 'article',
    26|             'record_id' => $r->id,
    27|             'title' => $w,

  Exception trace:

  1   Illuminate\Foundation\Bootstrap\HandleExceptions::handleError("Undefined variable: factory", "/Users/dragonar/Dev/pdp/database/factories/PostFactory.php", [Object(Faker\Generator), "Aut voluptatum sed aut beatae. 380"])
      /Users/dragonar/Dev/pdp/database/factories/PostFactory.php:23

  2   Illuminate\Database\Eloquent\Factory::{closure}(Object(Faker\Generator), [])
      /Users/dragonar/Dev/pdp/vendor/laravel/framework/src/Illuminate/Database/Eloquent/FactoryBuilder.php:273

  Please use the argument -v to see more details.

如果这解决了，我还想在同一个帖子中添加类别和标签。

Answer 1

请试试这个

$factory->define('App\MetaData', function($faker) use ($factory) {
    // Your stuff here
});

Answer 2

这里的问题是您试图在父级的工厂中定义子级。

您收到ErrorException : Undefined variable: factory 错误，告诉您$factory 未定义。这是因为你是在 post factory 的闭包中做的。

解决此问题的一种方法是在创建元数据时引用帖子，因此您不要同时创建它们。

<?php

/** @var \Illuminate\Database\Eloquent\Factory $factory */

use App\Post;
use App\MetaData;
use Faker\Factory;

$factory->define(Post::class, function () {
    $faker = Faker\Factory::create('en_IN');
    $w = $faker->unique()->sentence.' '.mt_rand(0,1000);
    return [
        'title' => $w,
        'slug' => strtolower(str_replace(' ', '-', $w)),
        'banner' => 'https://source.unsplash.com/random/600x600',
        'content' => $faker->text,
        'views' => mt_rand(0,1000),
        'status' => rand(0,1),
        'creator_id' => mt_rand(0,100),
        'moderator_id' => mt_rand(0,100),
    ];
});

$factory->define(MetaData::class, function () {
    return [
        'for' => 'article',
        'record_id' => factory(Post::class)->id,
        'title' => $w,
        'slug' => strtolower(str_replace(' ', '-', $w)),
        'description' => $faker->sentences,
        'banner' => 'https://source.unsplash.com/random/600x600',
        'keywords' => $faker->words,
        'status' => 1,
        'creator_id' => mt_rand(0,100),
        'moderator_id' => mt_rand(0,100),
    ];
});

这样做时，您首先创建帖子，然后创建元数据并在创建帖子时引用帖子。但是，我不确定这对您的问题有帮助。所以你可以做的是创建一个帮助类，你可以在其中为两个类传递一些覆盖，以防你想控制哪些数据进入每个模型。

可以这样做：

<?php

use App\Post;
use App\MetaData;

class FactoryHelper {
  public static function createPostWithMetaData(array $postAttributes = [], array $metaDataAttributes = [])
  {
      $post = factory(Post::class)->create(postAttributes);
      $metaData = factory(MetaData::class)->create(array_merge([
          'record_id' => $post->id
      ], $metaDataAttributes));

      return $post;
  }
}