Add data migration for the expenses

app/Database/migrations_data/2023_12_19_174436_correct_expenses.php

@@ -0,0 +1,49 @@
+<?php
+
+use App\Contracts\Migration;
+use App\Models\Expense;
+
+/**
+ * Update the expenses to add the airline ID
+ */
+return new class() extends Migration {
+    public function up(): void
+    {
+        /** @var Expense[] $all_expenses */
+        $all_expenses = Expense::all();
+        foreach ($all_expenses as $expense) {
+            $this->getAirlineId($expense);
+        }
+    }
+
+    /**
+     * Figure out the airline ID
+     *
+     * @param Expense $expense
+     *
+     * @return void
+     */
+    public function getAirlineId(Expense $expense): void
+    {
+        $klass = 'Expense';
+        if ($expense->ref_model) {
+            $ref = explode('\\', $expense->ref_model);
+            $klass = end($ref);
+            $obj = $expense->getReferencedObject();
+        }
+
+        if (empty($obj)) {
+            return;
+        }
+
+        if ($klass === 'Airport') {
+            // TODO: Get an airline ID?
+        } elseif ($klass === 'Subfleet') {
+            $expense->airline_id = $obj->airline_id;
+        } elseif ($klass === 'Aircraft') {
+            $expense->airline_id = $obj->airline->id;
+        }
+
+        $expense->save();
+    }
+};