typicms/nestablecollection

A Laravel Package that extends Collection to handle unlimited nested items following adjacency list model.

NestableCollection

, _(*1)

A Laravel Package that extends collections to handle nested items following adjacency list model., _(*2)

Installation

Run composer require typicms/nestablecollection, _(*3)

Usage

The model must have a parent_id attributes :, _(*4)

protected $fillable = [
    'parent_id',
    // …
];

and must use the following trait:, _(*5)

use TypiCMS\NestableTrait;

Now each time you get a collection of that model, it will be an instance of TypiCMS\NestableCollection in place of Illuminate\Database\Eloquent\Collection., _(*6)

If you want a tree of models, simply call the nest method on a collection ordered by parent_id asc :, _(*7)

Model::orderBy('parent_id')->get()->nest();

Of course you will probably want a position column as well. So you will have to order first by parent_id asc and then by position asc., _(*8)

Change the name of subcollections

By default, the name of the subcollections is items, but you can change it by calling the childrenName($name) method : For example if you want your subcollections being named children:, _(*9)

$collection->childrenName('children')->nest();

Indented and flattened list

listsFlattened() method generate the tree as a flattened list with id as keys and title as values, perfect for select/option, for example :, _(*10)

[
    '22' => 'Item 1 Title',
    '10' => '    Child 1 Title',
    '17' => '    Child 2 Title',
    '14' => 'Item 2 Title',
]

To use it, first call the nest() method, followed by the listsFlattened() method:, _(*11)

Model::orderBy('parent_id')->get()->nest()->listsFlattened();

By default it will look for a title column. You can send a custom column name as first parameter:, _(*12)

Model::orderBy('parent_id')->get()->nest()->listsFlattened('name');

Four spaces are used to indent by default, to use your own use the setIndent() method, followed by the listsFlattened() method:, _(*13)

Model::orderBy('parent_id')->get()->nest()->setIndent('> ')->listsFlattened();

Results:, _(*14)

[
    '22' => 'Item 1 Title',
    '10' => '> Child 1 Title',
    '17' => '> Child 2 Title',
    '14' => 'Item 2 Title',
]

Nesting a subtree

This package remove items that have missing ancestor, this doesn’t allow you to nest a branch of a tree. To avoid this, you can use the noCleaning() method:, _(*15)

Model::orderBy('parent_id')->get()->noCleaning()->nest();