CakePHP 3: How to display the sum of values ​​in a column from search results

Question

CakePHP: 3.1.4

I have a custom finder function in my table that gets all records from this month with the string "fee" with a decimal value.

In the view, I want to display the sum of the reward values ​​from this selection with a variable. I tried to figure this out with the book Using SQL Functions, but I don’t understand how to use the syntax correctly in my case.

Custom table search:

class TicketsTable extends Table
{
    // find all tickets created this month
    public function findThismonths(Query $query, array $options){

    // get first and last day of month
    $first_day_this_month = date('m-01-Y');
    $last_day_this_month  = date('m-t-Y');

    $query
    ->select(['id', 'created', 'fee', 'extend_fee'])
    ->where([ function($exp) {
        $first_day_this_month = date('Y-m-01'); 
        $last_day_this_month  = date('Y-m-t');
        return $exp->between('Tickets.created', $first_day_this_month, $last_day_this_month, 'date');
    }]);

    return $query;
}

I can easily get the number of records, but I do not understand that this works with the sum.

Controller:

class CashpositionsController extends AppController
{
public function overview()
{

    $tickets = TableRegistry::get('Tickets');
    $thismonths = $tickets->find('thismonths'); // get records with finder
    $thismonths_count = $thismonths->count();   // get count of records

    // that what I want but this syntax does not exist in Cake...
    $thismonths_sum = $thismonths->sum('fee'); // *nope*

    // set to display in view 
    $this->set('thismonths_count', $thismonths_count);
    $this->set('thismonths_sum', $thismonths_sum);

Then in the view:

<tr>
    <td>Number of tickets:</td>
    <td><?= $thismonths_count ?></td>
</tr>
<tr>
    <td>Sum of cash:</td>
    <td><?= $thismonth_sum ?></td>
</tr>

<?php foreach ($thismonths as $ticket): ?>
<tr>
    <td><?= h($ticket->id) ?> </td>
    <td><?= h($ticket->created) ?> </td>
    <td><?= h($ticket->fee) ?></td>
</tr>
<?php endforeach; ?>

The book gives an example:

// Results in SELECT COUNT(*) count FROM ...
$query = $articles->find();
$query->select(['count' => $query->func()->count('*')]);

But I can't get this to work for me either with sum ().

Answer 1

Collection ()

$thismonths_sum = $thismonths->sumOf('fee'); 

Answer 2

:

$totalFee = $this->find();
$totalFee->where([function ($exp) {
           $first_day_this_month = date('Y-m-01');
           $last_day_this_month  = date('Y-m-t');
           return $exp->between('Tickets.created', $first_day_this_month, $last_day_this_month, 'date');
            }
            ]
        );
$totalFee = $totalFee->select(['total' => $totalFee->func()->sum('fee')])->first();