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The method for showcasing additional fields using a foreign key in Laravel is by using Eloquent's relationship methods, such as hasOne(), belongsTo(), hasMany(), and belongsToMany().

For example, if you have a User model and a Post model, and each post has a foreign key to the user who created it, you can use the following code in your User model:

public function posts()
{
    return $this->hasMany(Post::class);
}

This will allow you to access all of the posts created by a user using $user->posts. To access additional fields stored in the posts table, such as the title or body of the post, you can use eager loading with the select() method:

$user = User::with(['posts' => function ($query) {
    $query->select('id', 'user_id', 'title', 'body');
}])->find($userId);

This will retrieve the user with the specified $userId and all of their posts, but only selected fields (id, user_id, title, and body) will be retrieved from the posts table. You can then access these fields using $user->posts->title or $user->posts->body.