Fast query to load specific data column - php

Question

I have this output format for kits result counting:
$out = array(
'in progress' => 0,
're-testing' => 0,
'rejected' => 0,
'negative' => 0,
'positive' => 0,
'inconclusive' => 0,
'failed' => 0,
'tested' => 0,
'available' => 0,
'total' => 0
);
I implemented a loop to query in the kits and then check for corrispondence in result value, like that:
$kits = Kit::where('customerId', Auth::id())->get();
foreach ($kits as $kit) {
if($kit->result !== '' && isset($out[$kit->result])){
++$out[$kit->result];
++$out['tested'];
}
if($kit->status == 'accepted' && !$kit->result){
++$out['in progress'];
}
++$out['total'];
}
unfortunately this solution is very slow. Do you have any suggestions for how to do that? thanks.
EDIT: Is slow because there are too many items.

Answer 1

First you are querying with a condition customerId, so add an index to customerId field will improve query performance a lot.
Then you don't have to count the total, you can use count().
$out['total'] = Kit::where('customerId', auth()->id())->count();
The part where you count the group of results ++$out[$kit->result]; looks like can be done with groupBy()
$kits = Kit::where('customerId', auth()->id())
->groupBy('result')
->select('result', DB::raw('COUNT(*) as no'))
->get();
Then for each result that you want to count, you can look up with firstWhere().
$out['positive'] = $kits->firstWhere('result', 'positive')->no;
$out['negative'] = $kits->firstWhere('result', 'negative')->no;
...
$out['tested'] is just the sum of all count.
$out['tested'] = $out['positive'] + $out['negative'] +...
And need another query for $out['in progress']
$out['in progress'] = Kit::where('customerId', auth()->id())
->where('status', 'accepted')
->whereNotNull('result')
->where('result', '!=', '')
->count();