eloquent-tree

Eloquent Tree is a tree model for Laravel Eloquent ORM.

Table of Contents

• Features
• Installation
• Migration
• Example usage
• Events
• Support

##Features

• Creating root, children and sibling nodes
• Getting children
• Getting descendants
• Getting ancestor
• Moving sub-tree
• Building tree on PHP side

Installation

Version 1.0 is not compatible with 0.*

Version 2.0 - Laravel 5 support

Version 2.1 - Laravel 5.1 support

Begin by installing this package through Composer. Edit your project's composer.json file to require gzero/eloquent-tree.

"require": {
    "laravel/framework": "4.2.*",
    "gzero/eloquent-tree": "v2.0"
},
"minimum-stability" : "dev"

Next, update Composer from the Terminal:

composer update

That's all now you can extend \Gzero\EloquentTree\Model\Tree in your project

Migration

Simply migration with all required columns

Schema::create(
    'trees',
    function (Blueprint $table) {
        $table->increments('id');
        $table->string('path', 255)->nullable();
        $table->integer('parent_id')->unsigned()->nullable();
        $table->integer('level')->default(0);
        $table->timestamps();
        $table->index(array('path', 'parent_id', 'level'));
        $table->foreign('parent_id')->references('id')->on('contents')->onDelete('CASCADE');
    }
);

Example usage

• Inserting and Updating new nodes
• Getting tree nodes
• Map from array
• Rendering tree

Inserting and updating new nodes

$root       = new Tree(); // New root
$root->setAsRoot();
$child      = with(new Tree())->setChildOf($root); // New child
$sibling    = new Tree();
$sibling->setSiblingOf($child); // New sibling

Getting tree nodes

Root - returning root node

$leaf->findRoot();

Children - returning flat collection of children. You can use Eloquent query builder.

$collection = $root->children()->get();
$collection2 = $root->children()->where('url', '=', 'slug')->get();

Ancestors - returning flat collection of ancestors, first is root, last is current node. You can use Eloquent query builder. Of course there are no guarantees that the structure of the tree would be complete if you do the query with additional where

$collection = $node->findAncestors()->get();
$collection2 = $node->findAncestors()->where('url', '=', 'slug')->get();

Descendants - returning flat collection of descendants, first is current node, last is leafs. You can use Eloquent query builder. Of course there are no guarantees that the structure of the tree would be complete if you do the query with additional where

$collection = $node->findDescendants()->get();
$collection2 = $node->findDescendants()->where('url', '=', 'slug')->get();

Building tree structure on PHP side - if some nodes will be missing, these branches will not be built

$treeRoot = $root->buildTree($root->findDescendants()->get())

Map from array

Three new roots, first with descendants

 Tree::mapArray(
            array(
                array(
                    'children' => array(
                        array(
                            'children' => array(
                                array(
                                    'children' => array(
                                        array(
                                            'children' => array()
                                        ),
                                        array(
                                            'children' => array()
                                        )
                                    )
                                ),
                                array(
                                    'children' => array()
                                )
                            )
                        ),
                        array(
                            'children' => array()
                        )
                    )
                ),
                array(
                    'children' => array()
                ),
                array(
                    'children' => array()
                )
            )
 );

Rendering tree

You can render tree built by the function buildTree

 $html = $root->render(
        'ul',
        function ($node) {
            return '<li>' . $node->title . '{sub-tree}</li>';
        },
        TRUE
        );
 echo $html;

Events

All tree models have additional events:

• updatingParent
• updatedParent
• updatedDescendants

You can use them for example to update additional tables

Support

If you enjoy my work, please consider making a small donation, so I can continue to maintain and create new software to help other users.