Example 4: Null Class in Relationships

Once we switch to higher levels of Larastan - we'll start to see more errors that are stricter and could be a great help. Let's set up the example:

app/Services/ClientReportsService.php

<?php
 
namespace App\Services;
 
use App\Models\Transaction;
use Carbon\Carbon;
 
class ClientReportsService
{
    public function getReport($request)
    {
        $query = Transaction::with('project')
            ->with('transaction_type')
            ->with('income_source')
            ->with('currency')
            ->orderBy('transaction_date', 'desc');
 
        if ($request->has('project')) {
            $query->where('project_id', $request->input('project'));
        }
 
        $transactions = $query->get();
 
        $entries = [];
        foreach ($transactions as $row) {
            $date = Carbon::createFromFormat(config('panel.date_format'), $row->transaction_date)->format('Y-m');
            if (!isset($entries[$date])) {
                $entries[$date] = [];
            }
            $currency = $row->currency->code;
            if (!isset($entries[$date][$currency])) {
                $entries[$date][$currency] = [
                    'income' => 0,
                    'expenses' => 0,
                    'fees' => 0,
                    'total' => 0,
                ];
            }
            $income = 0;
            $expenses = 0;
            $fees = 0;
            if ($row->amount > 0) {
                $income += $row->amount;
            } else {
                $expenses += $row->amount;
            }
            if (!is_null($row->income_source->fee_percent)) {
                $fees = $row->amount * ($row->income_source->fee_percent / 100);
            }
 
            $total = $income + $expenses - $fees;
            $entries[$date][$currency]['income'] += $income;
            $entries[$date][$currency]['expenses'] += $expenses;
            $entries[$date][$currency]['fees'] += $fees;
            $entries[$date][$currency]['total'] += $total;
        }
 
        return $entries;
    }
}

For this we'll expand our code example with our Relationship definitions to better see the whole picture:...