Move the model callbacks into Observables; reduce caching since it held balances incorrectly

app/Models/Observers/JournalTransactionObserver.php

@@ -0,0 +1,60 @@
+<?php
+
+namespace App\Models\Observers;
+
+use App\Models\JournalTransaction;
+
+class JournalTransactionObserver
+{
+    /**
+     * Set the ID to a UUID
+     * @param JournalTransaction $transaction
+     */
+    public function creating(JournalTransaction $transaction): void
+    {
+        if (!$transaction->id) {
+            $transaction->id = \Ramsey\Uuid\Uuid::uuid4()->toString();
+        }
+    }
+
+    /**
+     * After transaction is saved, adjust the journal balance
+     * @param JournalTransaction $transaction
+     */
+    public function saved(JournalTransaction $transaction): void
+    {
+        $journal = $transaction->journal;
+        if ($transaction['credit']) {
+            $balance = $journal->balance->toAmount();
+            $journal->balance = (int) $balance + $transaction->credit;
+        }
+
+        if ($transaction['debit']) {
+            $balance = $journal->balance->toAmount();
+            #$journal->balance = $journal->balance->subtract($transaction['debit']);
+            $journal->balance = (int) $balance - $transaction->debit;
+        }
+
+        $journal->save();
+    }
+
+    /**
+     * After transaction is deleted, adjust the balance on the journal
+     * @param JournalTransaction $transaction
+     */
+    public function deleted(JournalTransaction $transaction): void
+    {
+        $journal = $transaction->journal;
+        if ($transaction['credit']) {
+            $balance = $journal->balance->toAmount();
+            $journal->balance = $balance - $transaction['credit'];
+        }
+
+        if ($transaction['debit']) {
+            $balance = $journal->balance->toAmount();
+            $journal->balance = $balance + $transaction['debit'];
+        }
+
+        $journal->save();
+    }
+}