Fixed most importers.

app/Helpers/Csv/Mapper/Category.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace FireflyIII\Helpers\Csv\Mapper;
+
+use Auth;
+use FireflyIII\Models\Category as CategoryModel;
+
+/**
+ * Class Category
+ *
+ * @package FireflyIII\Helpers\Csv\Mapper
+ */
+class Category implements MapperInterface
+{
+
+    /**
+     * @return array
+     */
+    public function getMap()
+    {
+        $result = Auth::user()->categories()->get(['categories.*']);
+        $list   = [];
+
+        /** @var CategoryModel $category */
+        foreach ($result as $category) {
+            $list[$category->id] = $category->name;
+        }
+        asort($list);
+
+        return $list;
+    }
+}