### Install Laravel Tree Package

Source: https://github.com/xalaida/laravel-tree/blob/master/README.md

Installs the nevadskiy/laravel-tree package using Composer. This is the initial step to integrate the tree functionality into your Laravel project.

```Bash
composer require nevadskiy/laravel-tree
```

--------------------------------

### Getting Products of a Category and its Descendants

Source: https://github.com/xalaida/laravel-tree/blob/master/README.md

Demonstrates how to retrieve paginated products associated with a category and all its descendants using `HasManyDeep`.

```php
$products = $category->products()->paginate(20);
```

--------------------------------

### Querying Descendants with Materialized Path

Source: https://github.com/xalaida/laravel-tree/blob/master/README.md

Demonstrates how to query all descendants of a given node using the materialized path pattern in SQL. This example shows a LIKE query for general databases.

```SQL
SELECT * FROM categories WHERE path LIKE '1.%'
```

--------------------------------

### Querying Category Products via Join

Source: https://github.com/xalaida/laravel-tree/blob/master/README.md

An alternative method to get products of a category and its descendants by joining the `categories` table and using `whereSelfOrDescendantOf()`.

```php
$products = Product::query()
    ->join('categories', function (JoinClause $join) {
        $join->on('products.category_id', 'categories.id');
    })
    ->whereSelfOrDescendantOf($category)
    ->paginate(24, ['products.*']);
```

--------------------------------

### Ordering Nodes by Depth

Source: https://github.com/xalaida/laravel-tree/blob/master/README.md

Provides examples for ordering nodes in ascending and descending order based on their depth in the tree.

```php
$categories = Category::query()->orderByDepth()->get();
```

```php
$categories = Category::query()->orderByDepthDesc()->get();
```

--------------------------------

### Querying Category Products via WhereHas

Source: https://github.com/xalaida/laravel-tree/blob/master/README.md

A potentially slower method to get products of a category and its descendants using `whereHas` with a nested `whereSelfOrDescendantOf()` condition.

```php
$products = Product::query()
    ->whereHas('category', function (Builder $query) use ($category) {
        $query->whereSelfOrDescendantOf($category);
    })
    ->paginate(24);
```

--------------------------------

### Accessing Ancestors Relation

Source: https://github.com/xalaida/laravel-tree/blob/master/README.md

Provides examples of accessing all ancestors of a node, both directly via attribute and through the query builder, and joining the current node with its ancestors.

```php
foreach ($category->ancestors as $ancestor) {
    echo $ancestor->name;
}
```

```php
$ancestors = $category->ancestors()->get();
```

```php
$hierarchy = $category->joinAncestors();
```

--------------------------------

### Enable PostgreSQL Ltree Migration

Source: https://github.com/xalaida/laravel-tree/blob/master/README.md

Publishes and runs the package migration to enable the PostgreSQL Ltree extension, which is necessary for using the ltree column type in PostgreSQL databases.

```Bash
php artisan vendor:publish --tag=pgsql-ltree-migration
```

--------------------------------

### Querying Descendants with PostgreSQL Ltree

Source: https://github.com/xalaida/laravel-tree/blob/master/README.md

Shows how to query all descendants of a given node using PostgreSQL's ltree extension and its specialized query syntax with a GiST index for efficient tree traversal.

```SQL
SELECT * FROM categories WHERE path ~ '1.*'
```

--------------------------------

### Querying Ancestors (Including Self)

Source: https://github.com/xalaida/laravel-tree/blob/master/README.md

Demonstrates how to query for a node and all its ancestors using the `whereSelfOrAncestorOf()` scope.

```php
$ancestors = Category::query()->whereSelfOrAncestorOf($category)->get();
```

--------------------------------

### Querying Descendants (Including Self)

Source: https://github.com/xalaida/laravel-tree/blob/master/README.md

Shows how to query for a node and all its descendants using the `whereSelfOrDescendantOf()` scope.

```php
$descendants = Category::query()->whereSelfOrDescendantOf($category)->get();
```

--------------------------------

### Defining HasManyDeep Relation for Products

Source: https://github.com/xalaida/laravel-tree/blob/master/README.md

Shows how to define a `HasManyDeep` relation to link a `Category` model with its descendants' `Product` models.

```php
<?php

namespace AppModels;

use IlluminateDatabaseEloquentModel;
use NevadskiyTreeAsTree;
use NevadskiyTreeRelationsHasManyDeep;

class Category extends Model
{
    use AsTree;

    public function products(): HasManyDeep
    {
        return HasManyDeep::between($this, Product::class);
    }
}
```

--------------------------------

### Querying Root Nodes

Source: https://github.com/xalaida/laravel-tree/blob/master/README.md

Shows how to retrieve all root nodes in the tree structure using the `root()` query scope.

```php
$roots = Category::query()->root()->get();
```

--------------------------------

### Inserting Root and Child Models

Source: https://github.com/xalaida/laravel-tree/blob/master/README.md

Demonstrates how to insert a root node by saving a model and a child node by associating it with a parent using the `parent_id` or `parent` relation.

```php
$root = new Category();
$root->name = 'Science';
$root->save();
```

```php
$child = new Category;
$child->name = 'Physics';
$child->parent()->associate($root);
$child->save();
```

--------------------------------

### Moving a Node and its Subtree

Source: https://github.com/xalaida/laravel-tree/blob/master/README.md

Illustrates how to move a node to a new parent, which automatically updates the `parent_id` and `path` columns for the node and its descendants.

```php
$science = Category::query()->where('name', 'Science')->firstOrFail();
$physics = Category::query()->where('name', 'Physics')->firstOrFail();

$physics->parent()->associate($science);
$physics->save();
```

--------------------------------

### PostgreSQL Migration for Tree Structure

Source: https://github.com/xalaida/laravel-tree/blob/master/README.md

Defines a database migration for PostgreSQL to create a 'categories' table with an 'id', 'name', 'path' (ltree type), and 'parent_id' column, including a spatial index on the 'path' column.

```PHP
<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

return new class extends Migration
{
    public function up(): void
    {
        Schema::create('categories', function (Blueprint $table) {
            $table->id();
            $table->string('name');
            $table->ltree('path')->nullable()->spatialIndex();
            $table->timestamps();
        });

        Schema::table('categories', function (Blueprint $table) {
            $table->foreignId('parent_id')
                ->nullable()
                ->index()
                ->constrained('categories')
                ->cascadeOnDelete();
        });
    }

    public function down(): void
    {
        Schema::dropIfExists('categories');
    }
};
```

--------------------------------

### Querying Nodes by Depth

Source: https://github.com/xalaida/laravel-tree/blob/master/README.md

Illustrates how to fetch nodes that are at a specific depth level in the tree using the `whereDepth()` scope.

```php
$categories = Category::query()->whereDepth(3)->get();
```

--------------------------------

### MySQL/SQLite Migration for Tree Structure

Source: https://github.com/xalaida/laravel-tree/blob/master/README.md

Defines a database migration for MySQL or SQLite to create a 'categories' table with an 'id', 'name', 'path' (string type), and 'parent_id' column, including an index on the 'path' column.

```PHP
$table->string('path')->nullable()->index();
```

--------------------------------

### Eloquent Model Configuration

Source: https://github.com/xalaida/laravel-tree/blob/master/README.md

Configures an Eloquent model to use the tree functionality by using the `AsTree` trait. This automatically handles path manipulations based on the parent-child relationships.

```PHP
<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Nevadskiy\Tree\AsTree;

class Category extends Model
{
    use AsTree;
}
```

--------------------------------

### Accessing Children Relation

Source: https://github.com/xalaida/laravel-tree/blob/master/README.md

Illustrates how to retrieve and iterate over the children of a category model using the `children` relation.

```php
foreach ($category->children as $child) {
    echo $child->name;
}
```

--------------------------------

### Accessing Descendants Relation

Source: https://github.com/xalaida/laravel-tree/blob/master/README.md

Demonstrates how to access all descendants of a node, both directly via attribute and through the query builder.

```php
foreach ($category->descendants as $descendant) {
    echo $descendant->name;
}
```

```php
$ancestors = $category->descendants()->get();
```

--------------------------------

### Build Tree Structure

Source: https://github.com/xalaida/laravel-tree/blob/master/README.md

Builds a tree structure from a collection of nodes. It associates nodes using the 'children' relation and returns only the root nodes. This is useful for displaying hierarchical data.

```php
$tree = Category::query()->orderBy('name')->get()->tree();
```

--------------------------------

### Generate Breadcrumbs

Source: https://github.com/xalaida/laravel-tree/blob/master/README.md

Generates breadcrumbs from a hierarchical data structure. It joins ancestors and formats them into a string, typically separated by a delimiter like ' > '. This is useful for navigation.

```php
echo $category->joinAncestors()->reverse()->implode('name', ' > ');
```

--------------------------------

### Accessing Parent Relation

Source: https://github.com/xalaida/laravel-tree/blob/master/README.md

Shows how to access the parent of a category model using the `parent` relation provided by the `AsTree` trait.

```php
echo $category->parent->name;
```

--------------------------------

### Delete Subtree

Source: https://github.com/xalaida/laravel-tree/blob/master/README.md

Deletes a node and all of its descendants from the tree structure. This operation is performed using a query that targets the node and all its descendants.

```php
$category->newQuery()->whereSelfOrDescendantOf($category)->delete();
```

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