New migration command.

database/migrations/2022_08_21_104626_add_user_groups.php

@@ -0,0 +1,46 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+/**
+ *
+ */
+return new class extends Migration {
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up(): void
+    {
+        Schema::table(
+            'currency_exchange_rates', function (Blueprint $table) {
+
+            if (!Schema::hasColumn('currency_exchange_rates', 'user_group_id')) {
+                $table->bigInteger('user_group_id', false, true)->nullable()->after('user_id');
+                $table->foreign('user_group_id', 'cer_to_ugi')->references('id')->on('user_groups')->onDelete('set null')->onUpdate('cascade');
+            }
+        }
+        );
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down(): void
+    {
+        Schema::table(
+            'currency_exchange_rates', function (Blueprint $table) {
+
+            $table->dropForeign('cer_to_ugi');
+            if (Schema::hasColumn('currency_exchange_rates', 'user_group_id')) {
+                $table->dropColumn('user_group_id');
+            }
+        }
+        );
+    }
+};