Prep for solid multi-currency configuration.

database/migrations/2017_06_02_105232_changes_for_v450.php

@@ -0,0 +1,42 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+
+/**
+ * Class ChangesForV450
+ */
+class ChangesForV450 extends Migration
+{
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+    }
+
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        // add "foreign_amount" to transactions
+        Schema::table(
+            'transactions', function (Blueprint $table) {
+            $table->decimal('foreign_amount', 22, 12)->after('amount');
+        }
+        );
+
+        // add foreign transaction currency id to transactions (is nullable):
+        Schema::table(
+            'transactions', function (Blueprint $table) {
+            $table->integer('foreign_currency_id', false, true)->after('foreign_amount')->nullable();
+            $table->foreign('foreign_currency_id')->references('id')->on('transaction_currencies')->onDelete('set null');
+        }
+        );
+    }
+}