Installation guide

Requirements

• PHP 8.3 or later.
• Yii2 matching ~2.0.55 || ^22.0@dev.
• PHP PDO and the PDO driver for the selected database.
• Composer for dependency management.

Install the extension

Select the 0.2 API described by these guides:

composer require yii2-extensions/nested-sets-behavior:^0.2

Yii 2.0

Yii 2.0 uses Bower asset packages. If the application does not already configure a source for them, add Asset Packagist before installing:

composer config repositories.asset-packagist composer https://asset-packagist.org
composer require yii2-extensions/nested-sets-behavior:^0.2 'yiisoft/yii2:~2.0.55'

Yii 22

Use the declared Yii 22 constraint:

composer require yii2-extensions/nested-sets-behavior:^0.2 'yiisoft/yii2:^22.0@dev'

After resolving dependencies, verify the runtime with composer check-platform-reqs. Before writing trees, apply the lock registry migration and configure the model as described below.

Next steps

• Create the database tables and configure a model.
• Configure transactions and writer locking.
• Build and query trees.
• Run the test suites.

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