Laravel 5 Laravel Virgin：设置工厂顺序以确保已创建指定的数据集

在我的应用程序中，我有以下迁移：

<?php

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

class CreateGridTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('grid', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->unsignedInteger('width');
            $table->unsignedInteger('height');
        });
    }

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

显式创建表格网格和表。我想通过工厂填充数据：

/** @var \Illuminate\Database\Eloquent\Factory $factory */
use App\Model\Grid;
use App\Model\Rover;
use App\Constants\RoverConstants;
use Faker\Generator as Faker;

/**
 * Random Command Generator based upon:
 * https://stackoverflow.com/a/13212994/4706711
 * @param integer $length How many characters the wommand will contain.
 * @return string
 */
function generateRandomCommand($length = 10): string {
    return substr(str_shuffle(str_repeat($x=implode('',RoverConstants::AVAILABLE_COMMANDS), ceil($length/strlen($x)) )),1,$length);
}

$factory->define(Grid::class,function(Faker $faker){
    return [
        'width'=>rand(1,10),
        'height'=>rand(1,10)
    ];
});

$factory->define(Rover::class, function(Faker $faker) {
    $command = generateRandomCommand(rand(0));
    $commandLength = strlen($command);
    $commandPos = rand(0,$commandLength);
    $lastExecutedCommand = substr($command,$commandPos,$commandPos);

    $randomGrid=Grid::inRandomOrder();

    return [
        'grid_id' => $randomGrid->value('id'),
        'grid_pos_x' => rand(0,$randomGrid->value('width')),
        'grid_pos_y' => rand(0,$randomGrid->value('height')),
        'rotation' => RoverConstants::ORIENTATION_EAST,
        'command' => $command,
        'last_commandPos' => $commandPos,
        'last_command' => $lastExecutedCommand,
    ];
});

但是我如何确保$randomGrid=Grid:：inRandomOrder；将始终返回一个网格？换句话说，我想检查的是没有网格，然后打电话给网格工厂，从罗孚工厂制造一个网格

你知道我怎么做吗？

回答不够，这里仅供参考

如果您想确保始终存在网格，可以在该位置创建一个称为GridFactory的网格。如果要使用现有栅格，可以替代此属性。像这样：

$factory->define(Rover::class, function(Faker $faker) {
    $command = generateRandomCommand(rand(0));
    $commandLength = strlen($command);
    $commandPos = rand(0,$commandLength);
    $lastExecutedCommand = substr($command,$commandPos,$commandPos);

    //This will create a second entry in the database.
    $randomGrid = factory(Grid::class)->create();

    return [
        'grid_id' => $randomGrid->id, //no need for the value() method, they are all attributes
        'grid_pos_x' => rand(0,$randomGrid->width), 
        'grid_pos_y' => rand(0,$randomGrid->height),
        'rotation' => RoverConstants::ORIENTATION_EAST,
        'command' => $command,
        'last_commandPos' => $commandPos,
        'last_command' => $lastExecutedCommand,
    ];
});

上面的factory显示了在调用RoverFactory时动态创建的网格。使用factoryRover:：class->create创建一个新的漫游者也将创建一个新的网格并保存它。现在，如果要使用现有网格，可以执行以下操作：

factory(Rover::class)->create([
    'grid_id' => $existingGrid->id,
    'grid_pos_x' => rand(0, $existingGrid->width),
    'grid_pos_y' => rand(0, $existingGrid->height),
]);

这将创建一个带有现有网格的漫游者，您以前可能已经使用GridFactory或其他工具创建了该网格。希望这对你有用。享受拉威尔

编辑：

通常你会这样做：

$factory->define(Rover::class, function(Faker $faker) {
    $command = generateRandomCommand(rand(0));
    $commandLength = strlen($command);
    $commandPos = rand(0,$commandLength);
    $lastExecutedCommand = substr($command,$commandPos,$commandPos);

    return [
        'grid_id' => function() {
            return factory(Grid::class)->create()->id;
        }
        'grid_pos_x' => '', //But then i got nothing for this.
        'grid_pos_y' => '', //But then i also got nothing for this.
        'rotation' => RoverConstants::ORIENTATION_EAST,
        'command' => $command,
        'last_commandPos' => $commandPos,
        'last_command' => $lastExecutedCommand,
    ];
});

---

我建议你总是做一个新的网格。如果要使用现有网格，请在生成漫游者时执行此操作，但不在工厂中，例如factoryRover:：class->make['grid_id'=>x]，但在这种方法中，我的数据库中不是有两个网格吗？在这种情况下，如何在工厂中“禁用”网格的创建？我能把埃克特拉旗和伞送到工厂吗？你说得对。我将编辑我的答案。目前我想不出一个适当的办法来解决你的问题。打扰一下你可能想拒绝我的回答，因为它不能充分解决你的问题。除了覆盖要创建的数量和要覆盖的属性之外，我不知道如何向工厂传递额外的参数和/或标志。也许可以查看Laravel文档。此外，您还可以传递一个回调函数，返回网格id，如中所示。所以如果是ovveride，它就不会被调用。这就是我在我的答案编辑部分添加的内容。在那里，我使用了传递回调函数的正确方法。但是我不知道如何传递grid_pos_x和grid_pos_y变量。如果我让闭包访问闭包范围之外的一些变量，以便临时存储生成的网格，该怎么办？

$factory->define(Rover::class, function(Faker $faker) {
    $command = generateRandomCommand(rand(0));
    $commandLength = strlen($command);
    $commandPos = rand(0,$commandLength);
    $lastExecutedCommand = substr($command,$commandPos,$commandPos);

    return [
        'grid_id' => function() {
            return factory(Grid::class)->create()->id;
        }
        'grid_pos_x' => '', //But then i got nothing for this.
        'grid_pos_y' => '', //But then i also got nothing for this.
        'rotation' => RoverConstants::ORIENTATION_EAST,
        'command' => $command,
        'last_commandPos' => $commandPos,
        'last_command' => $lastExecutedCommand,
    ];
});