added migration to calculate base amount for payments table

database/migrations/2021_12_13_055813_calculate_base_amount_of_payments_table.php

@@ -0,0 +1,34 @@
+<?php
+
+use Crater\Models\Payment;
+use Illuminate\Database\Migrations\Migration;
+
+class CalculateBaseAmountOfPaymentsTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        $payments = Payment::all();
+
+        if ($payments) {
+            foreach ($payments as $payment) {
+                $payment->base_amount = $payment->exchange_rate * $payment->amount;
+                $payment->save();
+            }
+        }
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        //
+    }
+}