use laravel advanced where clauses to run a query - php

Question

Suppose I have a Course Model like this :
class Course extends Model
{
public function users ()
{
return $this->belongsToMany('App\User', 'course_user', 'course_id', 'user_id');
}
public function lessons ()
{
return $this->hasMany('App\Lesson', 'course_id', 'course_id');
}
}
Course fields are :
course_id
title
Each Course can have multiple lessons.
Lesson Model is like :
class Lesson extends Model
{
public function course ()
{
return $this->belongsTo('App\Course', 'course_id', 'course_id');
}
public function users ()
{
return $this->belongsToMany('App\User', 'lesson_user', 'lesson_id', 'user_id');
}
}
And it's fields are:
lesson_id
title
course_id
As you see there is a OneToMany relation between Course and Lesson and a ManyToMany relation between User and Course.
User And Course Pivot table named ~course_user` have these fields :
course_id
user_id
In the other hand there is a ManyToMany relation between User and Lesson. pivot table for those named lesson_user and have these fields :
lesson_id
user_id
passed
passed field show status of a user in a lesson. if it was 0 ,means user has not passed it yet otherwise he passed it.
User Model is like :
class User extends Model
{
public function lessons()
{
return $this->belongsToMany('App\Lesson', 'lesson_user', 'user_id', 'lesson_id')
}
public function courses ()
{
return $this->belongsToMany('App\Course', 'course_user', 'user_id', 'course_id');
}
}
Now I want to get user courses and calculate percent of passed lessons in each Course via best way, for example nested where clauses.

Answer 1

I think this might be not the best way. But it is easy to understand and maintainable
$courses = $user->courses->map(function($cource){
$all_lessions = $cource->pivot->count();
$done_lessions = $cource->pivot->where(passed,'<>',0)->count();
$percent = $done_lessions * 100 / $all_lessions;
return $cource->push(['percent'=>$percent]);
});
Now you can access through
foreach ($courses as $cource){
$cource->percent;
$cource->title;
//...
}

Answer 2

With inspiration from #KmasterYC answer I wrote bellow codes and all things work:
$userCourses =
$currentUser->courses()
->take(3)
->get();
$userCourses->map(function ($course) use ($currentUser) {
$allLessonsCount = $course->lessons->count();
$courseLessonID = $course->lessons->lists('lesson_id')->toArray();
$userLessonsCount = $currentUser->lessons()
->where('passed', '=', true)
->whereIn('lesson_user.lesson_id', $courseLessonID)
->count();
$percent = round($userLessonsCount * 100 / $allLessonsCount);
$course['percent'] = $percent;
});