Introduction

This Laravel Eloquent extension provides recursive relationships using common table.

Usage

• Getting Started
• Relationships
• Scopes
• Functions

Getting Started

Consider the following table schema for hierarchical data:

Schema::create('users', function (Blueprint $table) {
    $table->increments('id');
    $table->unsignedInteger('parent_id')->nullable();
});

Use the HasRecursiveRelationships trait in your model to work with recursive relationships:

class User extends Model
{
    use \RecursiveRelationships\Traits\HasRecursiveRelationships;
}

By default, the trait expects a parent key named parent_id. You can customize it by overriding getParentKeyName():

class User extends Model
{
    use \RecursiveRelationships\Traits\HasRecursiveRelationships;

    public function getParentKeyName()
    {
        return 'user_id'; // or anything
    }
}

Relationships

The trait provides various relationships:

• children(): The model's direct children.
• nestedChildren(): The model's nested children.
• parent(): The model's direct parent.
• nestedParents(): The model's nested parents by object.

$users = User::with('children')->get();

$users = User::with('nestedChildren')->get();

$users = User::with('parent')->get();

$users = User::with('nestedParents')->get();

Scopes

The trait provides query scopes to filter models by their position in the tree:

• hasChildren(): Models with children.
• hasParent(): Models with a parent.
• leaf(): Models without children.
• root(): Models without a parent.

$noLeaves = User::hasChildren()->get();

$noRoots = User::hasParent()->get();

$leaves = User::leaf()->get();

$roots = User::root()->get();

Functions

The trait provides helper functions:

• descendents(): The model's all Children in single array.
• ancestors(): The model's all parents in single array.
• siblings(): The parent's other children.

$descendents = User::find($id)->descendents();

$ancestors = User::find($id)->ancestors();

$siblings = User::find($id)->siblings();