Eloquent - groupBy and sum() of hasManyThrough relationship - database

Question

I have 3 models Job, Diary, Resource.
Jobs has relation with Diary and Diary has relation with Resource.
I wanted to get all Resource associated with a Job and did this using
public function labourers()
{
return $this->hasManyThrough(Resource::class, Diary::class, 'job_id');
}
On my Job class.
Now I want to group the results by User who's user_id is a column in Resource and then show the total hours.
This is the closest I can get.
$job = Job::where('job_number', 3007)->first();
$labour = $job->labourers()->get();
$results = $labour->groupBy('user_id');
echo $results;
foreach($results as $result)
{
$hours = $result->sum('hours');
echo $result[0]->user_id." - ";
echo $hours.". ";
}
This gets me the user_id and the sum of the hours but I am unable to access the user name through the relationship set up on the resource model
public function user()
{
return $this->belongsTo(User::class);
}
with
$result->user->name;
This produces
Property [user] does not exist on this collection instance.
How can I return a collection which allows me to access the users name and the sum of the hours.

Answer 1

The reason you're not able to access the user like that is because (in this case) groupBy is a method on the collection that returns another collection.
Firstly, eager load the user relationship on so that your code is a bit more efficient:
$labour = $job->labourers()->with('user')->get();
Secondly, since you have a collection you can use first() instead of [0]:
$result->first()->user_id
Lastly, you would have to access the user in the same way you're accessing the user_id:
$result->first()->user
So, you would end up with something like:
$job = Job::where('job_number', 3007)->first();
$labourers = $job->labourers()->with('user')->get();
$results = $labourers->groupBy('user_id');
foreach($results as $result)
{
echo $result->first()->user->name . ' - ' . $result->sum('hours') . '.';
}

Answer 2

You can try this
$job = Job::where('job_number', 3007)->with(['labourers' => function($query){
$query->select('id','user_id', DB::raw('sum(hours) as hours'))->groupBy('user_id');
}, labourers.user])->first();
$results = $job->labourers;
foreach($results as $result){
print_r($result->user);
print_r($result->hours);
}