Laravel Relationship with WHERE clause returns nothing - laravel

Question

I have areas. Each area have N curses
So, each curse belongsTo only one area.
My class
class Area extends Model
{
public function curses()
{
return $this->hasMany('App\Curse');
}
}
My Controller
public function getCursesByAreaId()
{
$areaId = Input::get('areaId'); //ID of selected Area
//area_id is a field of table CURSE. A FK to Area.
$areas = Area::with('curses')->where('area_id', $areaId)->get();
foreach($areas as $area)
{
var_dump($areas);
}
}
Curse Model
class Curseextends Model
{
protected $fillable =
[
'description',
'area_id'
];
}
Using the laravel's debugbar, I see that the query being executed is this:
select * from "areas" where "area_id" = '2'
Isn't it supose to run the relational query ? (with the joins)
Already checked if I'm receiving the right id and it's ok.
the problem is that it's bringing no data at all.

Answer 1

You need something like the following:
$areas = Area::whereHas('curses', function($query) use ($areaId) {
$query->where('area_id', $areaId);
})
->with('curses')
->get();
The whereHas is required only if you want to get the areas that has matching curses.
But, I think you can do it like this way if you only need the related curses because one curse only belong to a single area so, if have the area then you'll get all the curses attached to it:
$area = Area::with('curses')->find($areaId); // Single area
// Access the curses
$curses = $area->curses; // collection of curses

Answer 2

I think you are using relational area_id which is present in curse table, try retrieving the ID of area by id not by area_id, something like this:
$areas = Area::where('id', $areaId)->with('curses')->get();
Hope you get the solution.

Answer 3

Try this :
$areas = Area::whereHas('curses', function($area_query) use ($area_id) {
$area_query->where('area_id', $area_id)
})
->with('curses')
->get();