OLAS/app/models/Course.php

<?php

class Course extends Eloquent
{

  protected $fillable = array('name', 'code', 'number', 'section', 'program_id', 'user_id', 'semester_id');

  public function program()
  {
    return $this->belongsTo('Program');
  }

  public function students()
  {
  	return $this->belongsToMany('Student')->orderBy('name', 'asc')->withTimestamps();
  }

  public function user()
  {
    return $this->belongsTo('User')->orderBy('surnames', 'asc')->orderBy('first_name', 'asc');
  }

  // TODO: Remove
  public function activities()
  {
    return $this->hasMany('Activity')->orderBy('date', 'asc');
  }

  public function activity()
  {
      return $this->belongsTo('Activity');
  }

  public function assessedActivities()
  {
    return $this->hasMany('Activity')->whereNotNull('activities.outcomes_attempted')->orderBy('date', 'asc');
  }

  public function publishedActivities()
  {
    return $this->hasMany('Activity')->whereNotNull('activities.outcomes_attempted')->where('activities.draft', 0)->orderBy('date', 'asc');

  }

  public function outcomes_attempted()
  {
	return DB::table('courses')
	    	->join('activities', 'activities.course_id', '=', 'courses.id')
	    	->join('activity_criterion', 'activity_criterion.activity_id', '=', 'activities.id')
	    	->join('new_criteria', 'activity_criterion.criterion_id', '=', 'new_criteria.id')
	    	->join('criterion_objective_outcome', 'criterion_objective_outcome.criterion_id', '=', 'new_criteria.id')
	    	->where('courses.id','=',$this->id)
	    	->select('criterion_objective_outcome.outcome_id')
	    	->distinct()
	    	->orderBy('criterion_objective_outcome.outcome_id')
	    	->get();

//   	SELECT distinct cr.outcome_id FROM  courses c, activities a, activity_criterion ac, criteria cr WHERE c.id=a.course_id and a.id=ac.activity_id and ac.criterion_id=cr.id and c.id=1
// 	return $this->id;
  }

  public function outcomes_achieved()
  {
		 $criteria=DB::table('new_criteria')
	    	->join('activity_criterion', 'activity_criterion.criterion_id', '=', 'new_criteria.id')
	    	->join('activities', 'activity_criterion.activity_id', '=', 'activities.id')
	    	->join('courses', 'activities.course_id', '=', 'courses.id')
	    	->join('criterion_objective_outcome', 'criterion_objective_outcome.criterion_id', '=', 'new_criteria.id')
	    	->where('courses.id','=',$this->id)
	    	->select('new_criteria.id','expected_percentage_students_achieving','activity_criterion.activity_id')
	    	->distinct()
	    	->get()
			;

		$conteo=0;
		foreach($criteria as $criterion)
		{	
			$students_attempted=Criterion::students_attempted($criterion->id, $criterion->activity_id);
			$students_achieved=Criterion::students_achieved($criterion->id, $criterion->activity_id);
		
			if($students_attempted)
			{
				$percentage_students_who_achieved=100.0*$students_achieved/$students_attempted;
			}
			else
			{
				$percentage_students_who_achieved=0;
			}
			if($percentage_students_who_achieved>=$criterion->expected_percentage_students_achieving)
			{
				$conteo++;
			}
		}		
		return $conteo;
  }

  public function semester()
  {
    return $this->belongsTo('Semester');
  }

  public function sectionsWithOutcome($outcome_id) 
  {
      return Course::has('activities')->with(array('activities'=>function($query) use (&$outcome_id){
        $query->where('outcomes_attempted', 'not like', '\'%"'.$outcome_id.'":0%\'');
      }))->where('code',$this->code)->where('number',$this->number)->get();

  }
}