Laravel Object Relation does not work in foreach loop - php

Question

I have a typical model relation. I have the model QR, which hasMany Rating, and a Model Rating, which belongsTo Qr.
Now I want to output the Ratings, which belong to a single qr model, through a foreach loop like this:
<table>
<tr>
<th>ID</th>
<th>UnitID</th>
<th># of Ratings</th>
</tr>
#foreach($qrs as $qr->ratings)
<tr>
<td>{{$qr->id}}</td>
<td>{{$qr->unit_id}}</td>
<td>{{$qr->ratings->count()}}</td>
</tr>
#endforeach
</table>
This is my Controller:
public function index()
{
//
$unit = Unit::all()->first();
$qrs = Qr::all()->first();
return View::make('index')
->with('unit', $unit)
->with('qrs', $qrs);
}
Here are my two Models
Rating.php:
class Rating extends \Eloquent {
protected $guarded = [];
public function qr(){
return $this->belongsTo('Qr');
}
}
Qr.php:
class Qr extends \Eloquent {
protected $guarded = [];
public function unit(){
return $this->belongsTo('Unit');
}
public function ratings(){
return $this->hasMany('Rating');
}
}
I actually want to output the count of ratings, a Qr-Code has. I know it is possible to do it somehow like this:
{{Rating::where('qr_id', $qr->id)->count()}}
But I want to do it somehow like this in the foreach loop
{{ $Qr->rating->count() }}
If this is somehow possible.
I get the relation, if I just output the first() of Qr and then
var_dump($qrs->ratings->toArray())
But I don't know how to get the count Number of ratings in combination with the foreach loop. Any help would be dearly appreciated.

Answer 1

Couple of things wrong here:
// view:
#foreach($qrs as $qr->rating)
// should be:
#foreach($qrs as $qr)
// controller:
$unit = Unit::all()->first();
$qrs = Qr::all()->first();
// this way you get all Units then fetch first Unit from the collection,
// the same with Qrs, so change it to:
$unit = Unit::all(); // do you need it at all?
$qrs = Qr::with('ratings')->get();
This will solve the problem and in the foreach loop you will be able to access $qr->ratings->count() which will be Collection method.

Answer 2

At first you have used this:
#foreach($qrs as $qr->ratings)
You need to change it to this (as already stated in an answer):
#foreach($qrs as $qr)
Then in your index method you have used this:
public function index()
{
$unit = Unit::all()->first();
$qrs = Qr::all()->first();
return View::make('index')->with('unit', $unit)->with('qrs', $qrs);
}
In this case you need to get a collection of QR models and since Unit and Rating are related to Qr then you may use with and get() to get a collection of QR models like this:
public function index()
{
$qrs = Qr::with(array('unit', 'ratings'))->get();
return View::make('index')->with('qrs', $qrs);
}
Then you'll be able to loop the Qr models in your view like this:
#foreach($qrs as $qr)
<tr>
<td>{{ $qr->id }}</td>
<td>{{ $qr->unit_id }}</td>
<td>{{ $qr->ratings->count() }}</td>
</tr>
#endforeach