From e6cef37e0c782fe770db20888d99c17d10e2c479 Mon Sep 17 00:00:00 2001
From: Thomas Lange <code@nerdmind.de>
Date: Thu, 1 Jul 2021 20:11:34 +0200
Subject: Add category system to categorize posts (readme)

This commit implements a new category system to categorize posts. Each
category can have an unlimited number of nested children categories. A
single post don't necessarily need to be in a category, but it can.

Each category can have a full content body like posts or pages, so you
have enough space to describe the content of your categories.

Please note that you need to have at least the following MySQL/MariaDB
versions to use the category system, because it uses "WITH RECURSIVE"
database queries, the so-called "Common-Table-Expressions (CTE)".

MariaDB: 10.2.2
MySQL: 8.0

See: https://mariadb.com/kb/en/with/
See: https://dev.mysql.com/doc/refman/8.0/en/with.html
---
 core/include/post/main.php | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'core/include/post')

diff --git a/core/include/post/main.php b/core/include/post/main.php
index 86008f6..bfccc7b 100644
--- a/core/include/post/main.php
+++ b/core/include/post/main.php
@@ -2,6 +2,7 @@
 #===============================================================================
 # Get repositories
 #===============================================================================
+$CategoryRepository = Application::getRepository('Category');
 $PostRepository = Application::getRepository('Post');
 $UserRepository = Application::getRepository('User');
 
@@ -49,12 +50,28 @@ if($NextPost = $PostRepository->findNext($Post)) {
 	$post_data['NEXT'] = generateItemTemplateData($NextPost);
 }
 
+#===============================================================================
+# Generate category template data (including parents)
+#===============================================================================
+foreach($CategoryRepository->findWithParents($Post->get('category')) as $Category) {
+	$category_list[] = generateItemTemplateData($Category);
+}
+
+#===============================================================================
+# Define data variable for current category
+#===============================================================================
+if(isset($category_list)) {
+	$category_data = $category_list[array_key_last($category_list)];
+}
+
 #===============================================================================
 # Build document
 #===============================================================================
 $PostTemplate = Template\Factory::build('post/main');
 $PostTemplate->set('POST', $post_data);
 $PostTemplate->set('USER', $user_data);
+$PostTemplate->set('CATEGORY', $category_data ?? []);
+$PostTemplate->set('CATEGORIES', $category_list ?? []);
 
 $MainTemplate = Template\Factory::build('main');
 $MainTemplate->set('TYPE', 'POST');
-- 
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