Recursive to self model (Recursive Children and Recursive Parents) - Laravel

resursive-relation-to-self-model-laravel.php

<?php 
/**
 * @property float $wallet
 * @property string $name
 */
class User extends Authenticatable
{

    /**
     * @return BelongsTo
     */
    public function parent(): BelongsTo
    {
        return $this->belongsTo(self::class, 'parent_id');
    }

    /**
     * @return BelongsTo
     */
    public function parentRecursive(): BelongsTo
    {
        return $this->parent()->with('parentRecursive');
    }

    /**
     * Get current user's all recursive parents in a collection.
     */
    public function parentRecursiveFlatten()
    {
        $result = collect();
        $item = $this->parentRecursive;
        if ($item instanceof User) {
            $result->push($item);
            $result = $result->merge($item->parentRecursiveFlatten());
        }
        return $result;
    }

    /**
     * @return HasMany
     */
    public function children(): HasMany
    {
        return $this->hasMany(self::class, 'parent_id');
    }

    /**
     * @return HasMany
     */
    public function childrenRecursive(): HasMany
    {
        return $this->children()->with('childrenRecursive');
    }
}