Laravel - Filter a collection - laravel

Question

I am retrieving a bunch of records from the database to display:
$students = $bursary_administrator->students()/*->whereIn('status',[1,4,6,7])*/
->whereHas('bursaries.statuses', function($query) use ($request) {
$query->whereIn('status',[1,4,6,7])
->whereYear('status_start','<=',$request->year)
->where(function ($query) use ($request){
$query->whereYear('status_end','>=',$request->year)
->orWhereNull('status_end');
})
->where(function ($query) use ($request){
$query->whereYear('registration_date','<=',$request->year)
->orWhereNull('registration_date');
});
})
->with('bursaries','bursaries.statuses','bursaries.enrolments','bursaries.enrolments.courses')
->orderBy('student_name')->orderBy('student_middle_names')->orderBy('student_surname')->get();
Im displaying all these records in a table so need to fetch all of them.
I also however, need to get some count()'s based on this data. Now, I know I can perform individual queries for each count, but since I've already fetched all the data, I think it will be more optimised to just count the filtered data?
However, I am not winning. Both attempts listed below yield 0 as the output:
eg: using "where":
$summary['students_transfer'] = $students->where('status', '7')->count();
or, using "filter":
$summary['students_postgraduate'] = $students->filter(function ($student) {
return $student->qualification == 'Postgraduate' || $student->qualification == 'Postgraduate in Training';
})->count();
Not sure what I'm doing wrong?

Answer 1

You can utilize scopes in combination with withCount():
class Student extends Model
{
public function scopeTransfer($query)
{
return $query->where('status', '7');
}
public function scopePostgraduate($query)
{
return $query->where('qualification', 'Postgraduate')
->orWhere('qualification', 'Postgraduate in Training');
}
}
class Bursary_Administrator extends Model
{
public function students()
{
return $this->hasMany(Student::class);
}
public function students_transfer()
{
return $this->hasMany(Student::class)->transfer();
}
public function students_postgraduate()
{
return $this->hasMany(Student::class)->postgraduate();
}
}
$students = $bursary_administrator->students()/*->whereIn('status',[1,4,6,7])*/
->whereHas('bursaries.statuses', function($query) use ($request) {
$query->whereIn('status',[1,4,6,7])
->whereYear('status_start','<=',$request->year)
->where(function ($query) use ($request){
$query->whereYear('status_end','>=',$request->year)
->orWhereNull('status_end');
})
->where(function ($query) use ($request){
$query->whereYear('registration_date','<=',$request->year)
->orWhereNull('registration_date');
});
})
->with('bursaries','bursaries.statuses','bursaries.enrolments','bursaries.enrolments.courses')
->withCount('students_transfer', 'students_postgraduate')
->orderBy('student_name')->orderBy('student_middle_names')->orderBy('student_surname')->get();

Answer 2

Reason it wasnt working was because I was thinking of it as a database result instead of parent/child relationship.
ie, instead of:
$summary['students_postgraduate'] = $students->filter(function ($student) {
return $student->qualification == 'Postgraduate' || $student->qualification == 'Postgraduate in Training';
})->count();
I should of been doing:
$summary['students_postgraduate'] = $students->filter(function ($student) {
return $student->bursaries[0]->qualification == 'Postgraduate' || $student->bursaries[0]->qualification == 'Postgraduate in Training';
})->count();