FIX: make artisan install-module really work with submodules

app/Models/Module.php

@@ -13,6 +13,7 @@ class Module extends Model
     public $timestamps = false;
     protected $fillable = [
         'handler',
+        'parent_id',
         'name',
         'description',
         'alias',
@@ -30,12 +31,13 @@ class Module extends Model
      * @param        $alias
      * @param string $description
      * @param null   $handler
+     * @param        $parentModuleId
      * @param array  $settings
      *
      * @return Module
      * @throws \ErrorException
      */
-    public static function install($name, $alias, $description, $handler, $settings)
+    public static function install($name, $alias, $description, $handler, $parentModuleId, $settings)
     {
         // check if user does not want to install module in runtime
         if (!App::runningInConsole()) {
@@ -45,6 +47,12 @@ class Module extends Model
         $managesContent = $handler ? in_array('App\Handlers\Contracts\AppHandler', class_implements($handler)) : false;
         $supportCategories = $managesContent ? call_user_func([$handler, 'supportCategories']) : false;
 
+        if ($parentModuleId) {
+            $parentModule = Module::findOrFail($parentModuleId);
+            $parentModule->has_submodules = true;
+            $parentModule->save();
+        }
+
         // insert module into database
         $module = Module::create([
                                      'name'               => $name,
@@ -54,6 +62,7 @@ class Module extends Model
                                      'support_categories' => $supportCategories,
                                      'alias'              => $alias,
                                      'module_settings'    => json_encode($settings),
+                                     'parent_id'          => $parentModuleId,
                                      'enabled'            => 1
                                  ]);