Laravel / Eloquent: Search for rows by value in polymorphed table - laravel

Question

I'm stuck at the moment and hope someone can give me a hand. I'm using a polymorphic relation and want to search my database for rows that fulfill conditions in the "parent" and the "child" table.
To get concrete, one small example. Given the following structure I e.g. want to look for a property with price "600" and rooms "3". Is there a way to do that with eloquent?
Tables
Table properties (parent)
id
price
details_type [can be "Apartment" or "Parcel"]
details_id
Table apartments (child)
id
rooms
Table parcels (child)
id
... (does not have a "rooms" column)
Relationships
Class Property
public function details() {
return $this->morphTo();
}
Classes Apartment + Parcel
public function property() {
return $this->morphMany('Property', 'details')
}
What I tried
A lot, really. But somehow I'm always doing something wrong or missing something. The solutions that, in my opinion should work are either:
Property::with(array('details' => function($query) {
$query->where('rooms', 3);
}));
or
Property::with('details')
->whereHas('details', function($query) {
$query->where('rooms', '=', '3');
});
But in both cases I get the following FatalError.:
Class name must be a valid object or a string
Has anyone of you already had a similar problem? Thank you very much for any kind of hint.

Answer 1

Let's start with your naming convention:
public function detail() // It relates to a single object
{
return $this->morphTo();
}
And
public function properties() // It relates to several objects
{
return $this->morphMany('Property', 'details')
}
Then you would be able to do this:
$properties = Property::whereHas('details', function($q)
{
$q->where('rooms', '=', '3');
})
->where('price', '=', 600)
->get();
Please note that this will never return a Parcel, since there isn't a parcel with a room.