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    <h3>Editing: Relationship.php</h3>
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namespace Illuminate\Database\Eloquent\Factories;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsToMany;
use Illuminate\Database\Eloquent\Relations\HasOneOrMany;
use Illuminate\Database\Eloquent\Relations\MorphOneOrMany;

class Relationship
{
    /**
     * The related factory instance.
     *
     * @var \Illuminate\Database\Eloquent\Factories\Factory
     */
    protected $factory;

    /**
     * The relationship name.
     *
     * @var string
     */
    protected $relationship;

    /**
     * Create a new child relationship instance.
     *
     * @param  \Illuminate\Database\Eloquent\Factories\Factory  $factory
     * @param  string  $relationship
     * @return void
     */
    public function __construct(Factory $factory, $relationship)
    {
        $this-&gt;factory = $factory;
        $this-&gt;relationship = $relationship;
    }

    /**
     * Create the child relationship for the given parent model.
     *
     * @param  \Illuminate\Database\Eloquent\Model  $parent
     * @return void
     */
    public function createFor(Model $parent)
    {
        $relationship = $parent-&gt;{$this-&gt;relationship}();

        if ($relationship instanceof MorphOneOrMany) {
            $this-&gt;factory-&gt;state([
                $relationship-&gt;getMorphType() =&gt; $relationship-&gt;getMorphClass(),
                $relationship-&gt;getForeignKeyName() =&gt; $relationship-&gt;getParentKey(),
            ])-&gt;create([], $parent);
        } elseif ($relationship instanceof HasOneOrMany) {
            $this-&gt;factory-&gt;state([
                $relationship-&gt;getForeignKeyName() =&gt; $relationship-&gt;getParentKey(),
            ])-&gt;create([], $parent);
        } elseif ($relationship instanceof BelongsToMany) {
            $relationship-&gt;attach($this-&gt;factory-&gt;create([], $parent));
        }
    }
}
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