Laravel: saving multiple models at once / json nested input - json

Question

I am submitting a POST request to my API endpoint using Postman.
In my nested JSON, an artist has one or more albums and each album has one or more songs.
I have two questions:
1) How do I perform nested array validation in Laravel? I am looking for an optimal / standard Laravel way to do so.
2) How do I save multiple models together?
Note: I did create the relationships in my Eloquent models, such as
class Artist extends Eloquent {
public function albums()
{
return $this->hasMany('Album');
}
}
class Album extends Eloquent {
public function songs()
{
return $this->hasMany('Song');
}
}
class Song extends Eloquent {
public function album()
{
return $this->belongsTo('Album');
}
}
class Album extends Eloquent {
public function artist()
{
return $this->belongsTo('Artist');
}
}

Answer 1

1) Use the validator's each method:
$validator = Validator::make(Input::all(), [...rules...]);
$validator->each('albums', [...rules...]);
2) After creating the artist, loop through your albums and call create on the relationship:
$artist = Artist::create(Input::all());
foreach (Input::get('albums') as $album)
{
$artist->albums()->create($album);
}