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app/Models/Traits/Folder/CreatesDefaultFolders.php

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+<?php
+
+namespace App\Models\Traits\Folder;
+
+use App\Models\Group;
+use App\Models\User;
+
+trait CreatesDefaultFolders
+{
+    // --------------------------------------------------------------------------
+    // ----| Constants |---------------------------------------------------------
+    // --------------------------------------------------------------------------
+
+    /**
+     * Position of the unread items folder in the folders hierarchy.
+     */
+    private static $POSITION_UNREAD_ITEMS = 0;
+
+    /**
+     * Position of the root folder in the folders hierarchy.
+     */
+    private static $POSITION_ROOT = 1;
+
+    // --------------------------------------------------------------------------
+    // ----| Methods |-----------------------------------------------------------
+    // --------------------------------------------------------------------------
+
+    /**
+     * Create default folders for specified group. This method should be called
+     * only once when group is created.
+     *
+     * @param \App\Models\User $user User creating the folders
+     *
+     * @throws \App\Exceptions\UserDoesNotExistsException
+     */
+    public static function createDefaultFoldersFor(User $user, Group $group)
+    {
+        $group->folders()->saveMany([
+            new self([
+                'type'     => 'unread_items',
+                'title'    => 'Unread items',
+                'position' => self::$POSITION_UNREAD_ITEMS,
+                'user_id'  => $user->id,
+            ]),
+            new self([
+                'type'     => 'root',
+                'title'    => 'Root',
+                'position' => self::$POSITION_ROOT,
+                'user_id'  => $user->id,
+            ]),
+        ]);
+
+        session([
+            sprintf('selectedFolder.%d', $group->id) => $group->folders()->ofType('root')->first()->id,
+        ]);
+    }
+}