withSum in deep nested relationship in laravel eloquent - php

Question

I could not find this in the laravel docs on aggregate relationships
I was able to do something like this
private function refreshUsers()
{
$this->users = User::withSum(['taskTimeSessions'=> function ($query) {
$query->whereMonth('created_at',$this->month)
->where('is_reconciled',1);
}],'session_duration_in_seconds')
->get();
}
But now I am trying to query what is the total time a Sprint has or at the very least what the individual tasks inside a sprint have so that I can just sum the total of those somehow.
Sprint has many SprintTasks (pivot table)
SprintTask belongs to one Task
Task has many TaskTimeSessions
So I am trying to go find the total time of the TaskTimeSessions
Sprint::with([
'sprintTasks.task'=> function ($query) {
$query->withSum('taskTimeSessions','session_duration_in_seconds');
}])
->get();
I am not getting any errors, but not finding the result anywhere when dd
I thought i would get lucky and have something like this work
->withSum('sprintTasks.task.taskTimeSessions', 'session_duration_in_seconds')
But I am getting this error
Call to undefined method App\Models\Sprint::sprintTasks.task()
If anyone can help me out with some guidance on how to go about this, even if it doesn't include withSum it would be much appreciated.
As requested, these are the models.
// Sprint
public function sprintTasks()
{
return $this->hasMany(SprintTask::class, 'sprint_id');
}
// SprintTask
protected $fillable = [
'sprint_id',
'task_id',
'is_completed'
];
public function task()
{
return $this->belongsTo(Task::class,'task_id');
}
public function sprint()
{
return $this->belongsTo(Task::class,'sprint_id');
}
// Task
public function taskTimeSessions()
{
return $this->hasMany(TaskTimeSession::class, 'task_id');
}
// TaskTimeSessions
protected $fillable = [
'task_id',
'session_duration_in_seconds'
];
public function task()
{
return $this->belongsTo(Task::class,'task_id');
}
Is it possible to abstract this into the model as like
public function totalTaskTime() {
// using the relationship stuff to figure out the math and return it?
}
Looking for any advice on what the best approach is to do this.
Right now I am literally doing this in the blade and seems very bad
#php
$timeTracked = 0;
foreach ($sprint->sprintTasks as $sprintTask) {
$timeTracked += $sprintTask->task->time_tracked_in_seconds;
}
#endphp

Answer 1

You have a many to many relation between sprint and task
For that you can setup a direct relation belongsToMany with sprint_tasks as the pivot table
// Sprint
public function sprintTasks()
{
return $this->hasMany(SprintTask::class, 'sprint_id');
}
public function tasks()
{
return $this->belongsToMany(Task::class, 'sprint_tasks', 'sprint_id', 'task_id')->withPivot('is_completed');
}
Now you can use that relation to query your needs
Sprint::with(['tasks'=> function ($query) {
$query->withSum('taskTimeSessions','session_duration_in_seconds');
}])
->get();

Answer 2

There is a good package for Laravel for complex relationships - eloquent-has-many-deep. You can use it to build relationships through an unlimited number of tables.
composer require staudenmeir/eloquent-has-many-deep:"^1.7"
Sprint.php
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsToMany;
use Staudenmeir\EloquentHasManyDeep\HasManyDeep;
use Staudenmeir\EloquentHasManyDeep\HasRelationships;
class Sprint extends Model
{
use HasRelationships;
public function tasks(): BelongsToMany
{
return $this->belongsToMany(Task::class, 'sprint_tasks');
}
public function taskTimeSessions(): HasManyDeep
{
return $this->hasManyDeepFromRelations($this->tasks(), (new Task())->taskTimeSessions());
}
}
Task.php
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\HasMany;
class Task extends Model
{
use HasFactory;
public function taskTimeSessions(): HasMany
{
return $this->hasMany(TaskTimeSession::class);
}
}
Result:
$sprints = Sprint::withSum('taskTimeSessions', 'session_duration_in_seconds')->get();