Nested Sets Behavior for Yii 2

A modern nested sets behavior for the Yii framework utilizing the Modified Preorder Tree Traversal algorithm.

Installation

The preferred way to install this extension is through composer.

Either run

$ php composer.phar require creocoder/yii2-nested-sets:dev-master

or add

"creocoder/yii2-nested-sets": "dev-master"

to the require section of your composer.json file.

Configuring

First you need to configure model as follows:

use creocoder\nestedsets\NestedSetsBehavior;

class Tree extends \yii\db\ActiveRecord
{
    public function behaviors() {
        return [
            NestedSetsBehavior::className(),
        ];
    }

    public function transactions()
    {
        return [
            self::SCENARIO_DEFAULT => self::OP_ALL,
        ];
    }

    public static function find()
    {
        return new TreeQuery(get_called_class());
    }
}

Second you need to configure query model as follows:

use creocoder\nestedsets\NestedSetsQueryBehavior;

class TreeQuery extends \yii\db\ActiveQuery
{
    public function behaviors() {
        return [
            NestedSetsQueryBehavior::className(),
        ];
    }
}

Usage

TBD.