Laravel API resources, get only the latest occurrence from a collection - mysql

Question

Hi I am developing an api in laravel for an online course system. In this scheme I have a standard table for users, a table for courses and a pivot table that relates courses and users according to which they sign up for each course.
This last table also carries the events related to the progress of each user in the course, that is, Subscribed, Progress x%, Completed, Approved, so that each user can have multiple entries in the course_users table.
So far everything is clear and everything is fine, the point is that at a certain moment I need to return a json object with the information of the courses and pointed users, this can be clearly achieved using resource collection in the following way:
CourseCollection.php
<?php
namespace App\Http\Resources;
use Illuminate\Http\Resources\Json\ResourceCollection;
use App\Http\Resources\CargoResource;
class CourseCollection extends ResourceCollection
{
/**
* Transform the resource collection into an array.
*
* #param \Illuminate\Http\Request $request
* #return array
*/
public function toArray($request)
{
return [
'data' => CourseResource::collection($this->collection),
'links' => [
'self' => 'link-value',
],
];
}
}
CourseResource.php
<?php
namespace App\Http\Resources;
use Illuminate\Http\Resources\Json\JsonResource;
class CourseResource extends JsonResource
{
/**
* Transform the resource into an array.
*
* #param \Illuminate\Http\Request $request
* #return array
*/
public function toArray($request)
{
return [
'id' => $this->id,
'title'=> $this->title,
'description'=> $this->description,
'price'=> $this->price,
'users' => CourseUserResource::collection($this->whenLoaded('users'))
];
}
}
CourseUserResource.php
<?php
namespace App\Http\Resources;
use Illuminate\Http\Resources\Json\JsonResource;
class CourseUserResource extends JsonResource
{
public function toArray($request)
{
return [
'course_id'=> $this-> course_id,
'user_id'=> $this->user_id,
'event'=> $this->event,
'event_date' => $this->created_at->format('Y-m-d')
];
}
}
The problem to be solved is that with this scheme I obtain a collection of events for each user and course, but what I am needing is only the last event of each user, to know what their status is in relation to the course.
I am analyzing the option to perform the query by sql and then manually build the json object, but I would like to have a "laravel style" solution
Any ideas will be welcome!
Added Models & Controllers for clarification
class Course extends Model
{
protected $fillable = [
'title',
'slug',
'description',
'course_category_id',
'price',
'published'
];
...
public function history()
{
return $this->belongsToMany(CourseUser::class, 'course_id', 'id')->latest();
}
public function scopePublished($query)
{
return $query->where('published', 1);
}
}
class CourseUser extends Model
{
protected $fillable = [
'course_id',
'user_id',
'event'
];
}
class SearchController extends ApiController
{
public function search(Request $request)
{
$results = Course::with('history')
->published
->where('title', 'like', $request->filter['title'])
->where('description', 'like', $request->filter['description'])
->get();
if (! count($results) > 0) {
return $this->sendResponse(
__('No results for your query.'),
[
'code'=>204,
'message'=> __('There are no results for your search criteria.')
],
204
);
}
return new CourseCollection($results);
}
}