Multiple 1 to 1 relationships for common model - orm

Question

I'm building an app with Laravel 4 and using Eloquent as the ORM.
I think the easiest way to describe my question is with an example, albeit an unlikely one...
I have a Cookie model (as in OREO etc). Cookie can in turn belong to a Human or an Alien. So...
Is it possible (correct) to say:
A Cookie belongs to Human
AND
A Cookie belongs to Alien?
The same Cookie can't belong to both a Human and and Alien or shared between members of the same species.
So I guess what I'm really asking is, can the Cookie table have two foreign key columns, one for Humans and one for Aliens?
Thanks in advance for your advice.

Answer 1

You can have this:
name type nullable
------------------------------
id int no
name text no
human_id int yes
alien_id int yes
Those could be your classes:
class Cookie extends Eloquent {
public function human()
{
return $this->belongsTo('Human', 'human_id');
}
public function alien()
{
return $this->belongsTo('Alien', 'alien_id');
}
}
class Alien extends Eloquent {
public function cookie()
{
return $this->hasOne('Cookie', 'alien_id');
}
}
class Human extends Eloquent {
public function cookie()
{
return $this->hasOne('Cookie', 'human_id');
}
}
And then you could use them this way:
$human = Human::find(1);
echo $human->cookie->name;
$cookie = Cookie::find(1);
if ($cookie->human) echo $cookie->human->name;
if ($cookie->alien) echo $cookie->alien->name;