Laravel Model Average of Non-N/A Values - laravel

Question

I am looking for the best way to average the values of a submodel in Laravel, but ignore some of the values. The column I want to average is set as varchar, but contains either a number between 0 and 10 or the value 'N/A'. I need two averages on this column, one ignoring 'N/A' values, and one counting 'N/A' values as 0. I have the fucntions written how how they would be to calculate the averages but I am hoping to get some input on the best way to do this.
I would love to be able to call these functions like this:
$web_scored_tq = $website->scored_tq;
$web_uscored_tq = $website->unscored_tq;
Functions:
public function scored_tq() {
$valid_click_ads = $this->valid_click_ads;
$total = 0;
$num = 0;
foreach ($valid_click_ads as $valid_click_ad) {
if ($valid_click_ad->tq != "N/A") {
$total += $valid_click_ad->tq;
++$num;
}
}
$scored_tq = $total / $num;
}
public function unscored_tq() {
$valid_click_ads = $this->valid_click_ads;
$total = 0;
$num = 0;
foreach ($valid_click_ads as $valid_click_ad) {
if ($valid_click_ad->tq != "N/A") {
$total += $valid_click_ad->tq;
++$num;
} else {
++$num;
}
}
$unscored_tq = $total / $num;
}

Answer 1

I found laravel's model getFooAttribute! I used this to add the following functions to my Website model, and now can call $website->scored_tq or $website->unscored_tq.
public function getScoredTqAttribute() {
$valid_click_ads = $this->valid_click_ads;
$total = 0;
$num = 0;
foreach ($valid_click_ads as $valid_click_ad) {
if ($valid_click_ad->tq != -1) {
$total += $valid_click_ad->tq;
++$num;
}
}
if ( $num != 0 ) {
$scored_tq = $total / $num;
} else {
$scored_tq = '-';
}
return $scored_tq;
}
public function getUnscoredTqAttribute() {
$valid_click_ads = $this->valid_click_ads;
$total = 0;
$num = 0;
foreach ($valid_click_ads as $valid_click_ad) {
if ($valid_click_ad->tq != -1) {
$total += $valid_click_ad->tq;
}
++$num;
}
if ( $num != 0 ) {
$unscored_tq = $total / $num;
} else {
$unscored_tq = '-';
}
return $unscored_tq;
}
I also changed how my data is structured to integers, where "N/A" values are changed to -1.