Editing (v7+)

Topic Tree - Number of Children

Permalink December 22, 2017 at 7:50 PM

I'm attempting to display the number of children each topic contains. I've tried using these methods

$topic->getTreeNodeChildCount();
count($topic->getChildNodes());

Both return 0. Every other method I try works as advertised. Something wrong here, or bug maybe?

Kurtopsy replied on Dec 26, 2017 at 4:04 pm Permalink Reply

Bump. I'm still struggling to show the number of articles in each topic. Any help is appreciated. Thanks!

MrKDilkington replied on Dec 28, 2017 at 12:16 am Permalink Best Answer Reply

Hi Kurtopsy,

Here are some code snippets to try. They work, but they make a lot of database queries, so I imagine there is a more efficient way to do it.

get the number of pages a topic has been added to

use Concrete\Core\Tree\Node\Type\Topic;
$pageList = new PageList();
// get a topic by name or by ID
// $topic is an instance of Concrete\Core\Tree\Node\Type\Topic
// $topic = Topic::getByID(2);
$topic = Topic::getNodeByName('Projects');
if ($topic) {
    $pageList->filterByTopic($topic);
    echo sprintf('%s %s <br>', $topic->getTreeNodeDisplayName(), $pageList->getTotalResults());
}

get the child topics of a topic tree and how many pages they have been added to (1 level)
- this doesn't get child categories of a topic tree, just direct child topics

use Concrete\Core\Tree\Type\Topic as TopicTree;
use Concrete\Core\Tree\Node\Type\Topic;
$topicTree = new TopicTree();
// get a topic tree by name or ID
// $tree is an instance of Concrete\Core\Tree\Type\Topic
// $tree = $topicTree->getByID(4);
$tree = $topicTree->getByName('Blog Entries');
if ($tree) {
    // $treeNode is an instance of Concrete\Core\Tree\Node\Type\Category
    $treeNode = $tree->getRootTreeNodeObject();
    // $childNodeIDs is an array of child IDs
    $childNodeIDs = $treeNode->getAllChildNodeIDs();
    if ($childNodeIDs) {
        foreach($childNodeIDs as $childNodeID) {
            $pageList = new PageList();

Viewing 15 lines of 25 lines. View entire code block.

 
use Concrete\Core\Tree\Type\Topic as TopicTree;
use Concrete\Core\Tree\Node\Type\Topic;
 
$topicTree = new TopicTree();
// get a topic tree by name or ID
// $tree is an instance of Concrete\Core\Tree\Type\Topic
// $tree = $topicTree->getByID(4);
$tree = $topicTree->getByName('Blog Entries');
if ($tree) {
    // $treeNode is an instance of Concrete\Core\Tree\Node\Type\Category
    $treeNode = $tree->getRootTreeNodeObject();
    // $childNodeIDs is an array of child IDs
    $childNodeIDs = $treeNode->getAllChildNodeIDs();
    if ($childNodeIDs) {
        foreach($childNodeIDs as $childNodeID) {
            $pageList = new PageList();
            // direct child topics are an instance of Concrete\Core\Tree\Node\Type\Topic
            // child cateogies are an instance of Concrete\Core\Tree\Node\Type\Category
            $topic = Topic::getByID($childNodeID);
            if ($topic && $topic instanceof Topic) {
                $pageList->filterByTopic($topic);
                echo sprintf('%s %s <br>', $topic->getTreeNodeDisplayName(), $pageList->getTotalResults());
            }
        }
    }
}

get the child topics of a topic tree and how many pages they have been added to (2 levels)
- this will get the direct child topics and direct child topics of a direct child category

use Concrete\Core\Tree\Type\Topic as TopicTree;
use Concrete\Core\Tree\Node\Type\Topic;
$topicTree = new TopicTree();
// get a topic tree by name or ID
// $tree is an instance of Concrete\Core\Tree\Type\Topic
// $tree = $topicTree->getByID(4);
$tree = $topicTree->getByName('Blog Entries');
if ($tree) {
    // $treeNode is an instance of Concrete\Core\Tree\Node\Type\Category
    $treeNode = $tree->getRootTreeNodeObject();
    // $childNodeIDs is an array of child IDs
    $childNodeIDs = $treeNode->getAllChildNodeIDs();
    if ($childNodeIDs) {
        foreach($childNodeIDs as $childNodeID) {
            $pageList = new PageList();

Viewing 15 lines of 42 lines. View entire code block.

 
use Concrete\Core\Tree\Type\Topic as TopicTree;
use Concrete\Core\Tree\Node\Type\Topic;
 
$topicTree = new TopicTree();
// get a topic tree by name or ID
// $tree is an instance of Concrete\Core\Tree\Type\Topic
// $tree = $topicTree->getByID(4);
$tree = $topicTree->getByName('Blog Entries');
if ($tree) {
    // $treeNode is an instance of Concrete\Core\Tree\Node\Type\Category
    $treeNode = $tree->getRootTreeNodeObject();
    // $childNodeIDs is an array of child IDs
    $childNodeIDs = $treeNode->getAllChildNodeIDs();
    if ($childNodeIDs) {
        foreach($childNodeIDs as $childNodeID) {
            $pageList = new PageList();
            // direct child topics are an instance of Concrete\Core\Tree\Node\Type\Topic
            // child cateogies are an instance of Concrete\Core\Tree\Node\Type\Category
            $topic = Topic::getByID($childNodeID);
            if ($topic && $topic instanceof Topic) {
                $pageList->filterByTopic($topic);
                echo sprintf('%s %s <br>', $topic->getTreeNodeDisplayName(), $pageList->getTotalResults());
            } elseif ($topic && $topic instanceof Concrete\Core\Tree\Node\Type\Category) {
                echo $topic->getTreeNodeName() . '<br>';
                $childNodeIDs2 = $topic->getAllChildNodeIDs();
                if ($childNodeIDs2) {
                    echo '<ul>';
                    foreach ($childNodeIDs2 as $childNodeID2) {
                        $pageList2 = new PageList();
                        // direct child topics are an instance of Concrete\Core\Tree\Node\Type\Topic
                        // child cateogies are an instance of Concrete\Core\Tree\Node\Type\Category
                        $topic2 = Topic::getByID($childNodeID2);
                        if ($topic2 && $topic2 instanceof Topic) {
                            $pageList2->filterByTopic($topic2);
                            echo sprintf('<li>%s %s</li>', $topic2->getTreeNodeDisplayName(), $pageList2->getTotalResults());
                        }
                    }
                    echo '</ul>';
                }
            }
        }
    }
}

get all topic trees
- you can then loop over the topic trees to get the topic and topic categories

use Concrete\Core\Tree\Type\Topic as TopicTree;
$topicTree = new TopicTree();
// get all topic trees
// $trees is an array of Concrete\Core\Tree\Type\Topic instances
$trees = $topicTree->getList();
if ($trees) {
    foreach ($trees as $tree) {
        echo $tree->getTreeName() . '<br>';
        $treeNode = $tree->getRootTreeNodeObject();
        $childNodeIDs = $treeNode->getAllChildNodeIDs();
    }
}

Kurtopsy replied on Dec 28, 2017 at 5:31 pm Permalink Reply

Hi MrKDilkington,

Thanks for taking the time with this! I seem to get the error: "Call to a member function getChildNodes() on null". Does it matter if it's in a page template and not a page list template?

EDIT: I got it now. I was putting in the handle not the name.

surefyre replied on Aug 23, 2018 at 10:24 am Permalink Reply 1 Attachment

On a related issue, if:
getTreeNodeParentObject()->getTreeNodeChildCount() returns 4

Then why is:
getTreeNodeParentObject()->getChildNodes() returning 'array[0]' ?

I expected an array of four treenodes or similar.

surefyre replied on Aug 23, 2018 at 10:57 am Permalink Reply

I worked around it like this:

use \Concrete\Core\Tree\Node\Node as TreeNode;
$ch = $user_provider[0]->getTreeNodeParentObject()->getAllChildNodeIDs();
foreach($ch as $item) {
    $node = TreeNode::getByID($item);
....

But unless getChildNodes() is poorly named it wouldn't seem to behave as expected?

surefyre replied on Feb 8, 2019 at 12:15 pm Permalink Reply

Core Version - 8.4.2
It's worth noting that if you have:

MyNode
----topic
----topic
----topic
----category
--------topic2

Then getAllChildNodeIDs will also return topic2 (as well as category id but you can filter that with instanceof)

I can't find any way yet to get non-recursive children of the node so now I need to find a reliable method to filter out children of children which is burning a lot of time on what should be a simple task.

EDIT: I've literally just accidentally discovered populateDirectChildrenOnly() (by looking through the code - a poor way to discover things) which will load child nodes and cause getChildNodes() to work you'll get the 'category' entry but just filter that with instanceof.

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