Show the balance after the occurrence of a transaction (experimental).

app/models/Account.php

@@ -72,6 +72,20 @@ class Account extends Ardent
         );
     }
 
+    public function balanceBeforeJournal(TransactionJournal $journal)
+    {
+        return floatval(
+            $this->transactions()
+                ->leftJoin(
+                    'transaction_journals', 'transaction_journals.id', '=', 'transactions.transaction_journal_id'
+                )
+                ->where('transaction_journals.date', '<=', $journal->date->format('Y-m-d'))
+                ->where('transaction_journals.created_at', '<=', $journal->created_at->format('Y-m-d H:i:s'))
+                ->where('transaction_journals.id','!=',$journal->id)
+                ->sum('transactions.amount')
+        );
+    }
+
     /**
      * Transactions.
      *

app/views/transactions/show.blade.php

@@ -46,12 +46,16 @@
     <div class="col-lg-6 col-md-6 col-sm-12">
         <h3>Transactions</h3>
         @foreach($journal->transactions as $t)
-        <h4>{{{$t->account->name}}}<br /><small>{{{$t->account->accounttype->description}}}</small></h4>
+        <h4><a href="{{route('accounts.show',$t->account->id)}}">{{{$t->account->name}}}</a><br /><small>{{{$t->account->accounttype->description}}}</small></h4>
         <table class="table">
             <tr>
                 <td>Amount</td>
                 <td>{{mf($t->amount)}}</td>
             </tr>
+            <tr>
+                <td>New balance</td>
+                <td>{{mf($t->account->balanceBeforeJournal($journal))}} &rarr; {{mf($t->account->balanceBeforeJournal($journal) + $t->amount)}}</td>
+            </tr>
             @if(!is_null($t->description))
             <tr>
                 <td>Description</td>