根据Joomla中的当前用户ID显示动态内容

Question

I am developing a custom module that displays a dynamic list of articles based on whether the current user has read an article or not. When a user reads or 'submits' an article, the article id and title is stored in a table called "completed_quests." The dynamic list will only display articles that are NOT found in the completed_quests table. The code below is completely functional, however I am running into a bit of an issue.

Currently, the list is being displayed in the same way regardless of which user is logged in. For instance, let's say that user 540 reads and submits an article. When user 541 logs in - it is displaying the list as if user 541 has submitted the quest as well. I may be over complicating this, but I need to get the list to display in a unique way depending on which user is logged in. Please see the code below. I have already pulled the user ID from the database and defined the $userID variable. Now I just need to know where it fits in to the equation.

Edit: Below is the revised, working code.

<?php

$catID = JRequest::getVar('id');
$user = JFactory::getUser();
$userID = (int)$user->id;

$query = "SELECT * FROM arp2i_completed_quests AS r
RIGHT JOIN arp2i_content AS c
ON c.id=r.id 
AND c.catid=r.catid 
AND r.user_id = $userID
WHERE r.user_id IS NULL "; // prepare query

$db = &JFactory::getDBO(); // get database object
$db->setQuery($query); // apply query
$articles = $db->loadObjectList(); // execute query, return result list

foreach($articles as $article){ // loop through articles

if ($article->id >1 && $article->catid == $catID) {
       echo '<a href="http://localhost/quest/index.php/quests/' . $article->id . '-' . $article->title . '">' . 'ID:' . $article->id . ' Title: ' . $article->title . '</a>' . '<br />';}
} 

?>

Answer 1

According to your answer is the id field in the arp2i_completed_quests the article id. Then you have to swap the join and make a condition with the user id.

<?php
$catID = JRequest::getVar('id');
$user = JFactory::getUser();
$userID = (int)$user->id;

$query = "SELECT * FROM arp2i_content as c ";
$query .= "left JOIN arp2i_completed_quests as r on ";
$query .= "c.id=r.id AND c.catid=r.catid and r.user_id != ".$userID." ";
$query .= "where r.id is null"; // prepare query

$db = JFactory::getDBO(); // get database object
$db->setQuery($query); // apply query
$articles = $db->loadObjectList(); // execute query, return result list

foreach ($articles as $article) { // loop through articles
    if ($article->id > 1 and $article->catid == $catID) {
        echo '<a href="http://localhost/quest/index.php/quests/' . $article->id . '-' . $article->title . '">' . 'ID:' .
             $article->id . ' Title: ' . $article->title . '</a>' . '<br />';
    }
}

?>