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ClosureTable

This is a database manipulation package for the Laravel 5.4+ framework. You may want to use it when you need to store and operate hierarchical data in your database. The package is an implementation of a well-known design pattern called closure table. However, in order to simplify and optimize SQL SELECT queries, it uses adjacency lists to query direct parent/child relationships.

Contents:

• Installation
• Setup
• Requirements
• Examples → List of Scopes
• Examples → Parent/Root
• Examples → Ancestors
• Examples → Descendants
• Examples → Children
• Examples → Siblings
• Examples → Tree
• Examples → Collection Methods

Installation

It's strongly recommended to use Composer to install the package:

$ composer require franzose/closure-table

If you use Laravel 5.5+, the package's service provider is automatically registered for you thanks to the package auto-discovery feature. Otherwise, you have to manually add it to your config/app.php:

<?php

return [
    'providers' => [
        Franzose\ClosureTable\ClosureTableServiceProvider::class
    ]
];

Setup

In a basic scenario, you can simply run the following command:

$ php artisan closuretable:make Node

Where Node is the name of the entity model. This is what you get from running the above:

1. Two models in the app directory: App\Node and App\NodeClosure
   
2. A new migration in the database/migrations directory

As you can see, the command requires a single argument, name of the entity model. However, it accepts several options in order to provide some sort of customization:

Option	Alias	Meaning
namespace	ns	Custom namespace for generated models. Keep in mind that the given namespace will override model namespaces: php artisan closuretable:make Foo\\Node --namespace=Qux --closure=Bar\\NodeTree will generate Qux\Node and Qux\NodeTree models.
entity-table	et	Database table name for the entity model
closure	c	Class name for the closure model
closure-table	ct	Database table name for the closure model
models-path	mdl	Directory in which to put generated models
migrations-path	mgr	Directory in which to put generated migrations
use-innodb	i	This flag will tell the generator to set database engine to InnoDB. Useful only if you use MySQL

Requirements

You have to keep in mind that, by design of this package, the models/tables have a required minimum of attributes/columns:

Entity
Attribute/Column	Customized by	Meaning
parent_id	Entity::getParentIdColumn()	ID of the node's immediate parent, simplifies queries for immediate parent/child nodes.
position	Entity::getPositionColumn()	Node position, allows to order nodes of the same depth level
ClosureTable
Attribute/Column	Customized by	Meaning
id
ancestor	ClosureTable::getAncestorColumn()	Parent (self, immediate, distant) node ID
descendant	ClosureTable::getDescendantColumn()	Child (self, immediate, distant) node ID
depth	ClosureTable::getDepthColumn()	Current nesting level, 0+

Examples

In the examples, let's assume that we've set up a Node model which extends the Franzose\ClosureTable\Models\Entity model.

Scopes

Since ClosureTable 6, a lot of query scopes have become available in the Entity model:

ancestors()
ancestorsOf($id)
ancestorsWithSelf()
ancestorsWithSelfOf($id)
descendants()
descendantsOf($id)
descendantsWithSelf()
descendantsWithSelfOf($id)
childNode()
childNodeOf($id)
childAt(int $position)
childOf($id, int $position)
firstChild()
firstChildOf($id)
lastChild()
lastChildOf($id)
childrenRange(int $from, int $to = null)
childrenRangeOf($id, int $from, int $to = null)
sibling()
siblingOf($id)
siblings()
siblingsOf($id)
neighbors()
neighborsOf($id)
siblingAt(int $position)
siblingOfAt($id, int $position)
firstSibling()
firstSiblingOf($id)
lastSibling()
lastSiblingOf($id)
prevSibling()
prevSiblingOf($id)
prevSiblings()
prevSiblingsOf($id)
nextSibling()
nextSiblingOf($id)
nextSiblings()
nextSiblingsOf($id)
siblingsRange(int $from, int $to = null)
siblingsRangeOf($id, int $from, int $to = null)

You can learn how to use query scopes from the Laravel documentation.

Parent/Root

<?php
$nodes = [
    new Node(['id' => 1]),
    new Node(['id' => 2]),
    new Node(['id' => 3]),
    new Node(['id' => 4, 'parent_id' => 1])
];

foreach ($nodes as $node) {
    $node->save();
}

Node::getRoots()->pluck('id')->toArray(); // [1, 2, 3]
Node::find(1)->isRoot(); // true
Node::find(1)->isParent(); // true
Node::find(4)->isRoot(); // false
Node::find(4)->isParent(); // false

// make node 4 a root at the fourth position (1 => 0, 2 => 1, 3 => 2, 4 => 3)
$node = Node::find(4)->makeRoot(3);
$node->isRoot(); // true
$node->position; // 3

Node::find(4)->moveTo(0, Node::find(2)); // same as Node::find(4)->moveTo(0, 2);
Node::find(2)->getChildren()->pluck('id')->toArray(); // [4]

Ancestors

<?php
$nodes = [
    new Node(['id' => 1]),
    new Node(['id' => 2, 'parent_id' => 1]),
    new Node(['id' => 3, 'parent_id' => 2]),
    new Node(['id' => 4, 'parent_id' => 3])
];

foreach ($nodes as $node) {
    $node->save();
}

Node::find(4)->getAncestors()->pluck('id')->toArray(); // [1, 2, 3]
Node::find(4)->countAncestors(); // 3
Node::find(4)->hasAncestors(); // true
Node::find(4)->ancestors()->where('id', '>', 1)->get()->pluck('id')->toArray(); // [2, 3];
Node::find(4)->ancestorsWithSelf()->where('id', '>', 1)->get()->pluck('id')->toArray(); // [2, 3, 4];
Node::ancestorsOf(4)->where('id', '>', 1)->get()->pluck('id')->toArray(); // [2, 3];
Node::ancestorsWithSelfOf(4)->where('id', '>', 1)->get()->pluck('id')->toArray(); // [2, 3, 4];

There are several methods that have been deprecated since ClosureTable 6:

-Node::find(4)->getAncestorsTree();
+Node::find(4)->getAncestors()->toTree();

-Node::find(4)->getAncestorsWhere('id', '>', 1);
+Node::find(4)->ancestors()->where('id', '>', 1)->get();

Descendants

<?php
$nodes = [
    new Node(['id' => 1]),
    new Node(['id' => 2, 'parent_id' => 1]),
    new Node(['id' => 3, 'parent_id' => 2]),
    new Node(['id' => 4, 'parent_id' => 3])
];

foreach ($nodes as $node) {
    $node->save();
}

Node::find(1)->getDescendants()->pluck('id')->toArray(); // [2, 3, 4]
Node::find(1)->countDescendants(); // 3
Node::find(1)->hasDescendants(); // true
Node::find(1)->descendants()->where('id', '<', 4)->get()->pluck('id')->toArray(); // [2, 3];
Node::find(1)->descendantsWithSelf()->where('id', '<', 4)->get()->pluck('id')->toArray(); // [1, 2, 3];
Node::descendantsOf(1)->where('id', '<', 4)->get()->pluck('id')->toArray(); // [2, 3];
Node::descendantsWithSelfOf(1)->where('id', '<', 4)->get()->pluck('id')->toArray(); // [1, 2, 3];

There are several methods that have been deprecated since ClosureTable 6:

-Node::find(4)->getDescendantsTree();
+Node::find(4)->getDescendants()->toTree();

-Node::find(4)->getDescendantsWhere('foo', '=', 'bar');
+Node::find(4)->descendants()->where('foo', '=', 'bar')->get();

Children

<?php
$nodes = [
    new Node(['id' => 1]),
    new Node(['id' => 2, 'parent_id' => 1]),
    new Node(['id' => 3, 'parent_id' => 1]),
    new Node(['id' => 4, 'parent_id' => 1]),
    new Node(['id' => 5, 'parent_id' => 1]),
    new Node(['id' => 6, 'parent_id' => 2]),
    new Node(['id' => 7, 'parent_id' => 3])
];

foreach ($nodes as $node) {
    $node->save();
}

Node::find(1)->getChildren()->pluck('id')->toArray(); // [2, 3, 4, 5]
Node::find(1)->countChildren(); // 3
Node::find(1)->hasChildren(); // true

// get child at the second position (positions start from zero)
Node::find(1)->getChildAt(1)->id; // 3

Node::find(1)->getChildrenRange(1)->pluck('id')->toArray(); // [3, 4, 5]
Node::find(1)->getChildrenRange(0, 2)->pluck('id')->toArray(); // [2, 3, 4]

Node::find(1)->getFirstChild()->id; // 2
Node::find(1)->getLastChild()->id; // 5

Node::find(6)->countChildren(); // 0
Node::find(6)->hasChildren(); // false

Node::find(6)->addChild(new Node(['id' => 7]));

Node::find(1)->addChildren([new Node(['id' => 8]), new Node(['id' => 9])], 2);
Node::find(1)->getChildren()->pluck('position', 'id')->toArray(); // [2 => 0, 3 => 1, 8 => 2, 9 => 3, 4 => 4, 5 => 5]

// remove child by its position
Node::find(1)->removeChild(2);
Node::find(1)->getChildren()->pluck('position', 'id')->toArray(); // [2 => 0, 3 => 1, 9 => 2, 4 => 3, 5 => 4]

Node::find(1)->removeChildren(2, 4);
Node::find(1)->getChildren()->pluck('position', 'id')->toArray(); // [2 => 0, 3 => 1]

Siblings

<?php
$nodes = [
    new Node(['id' => 1]),
    new Node(['id' => 2, 'parent_id' => 1]),
    new Node(['id' => 3, 'parent_id' => 1]),
    new Node(['id' => 4, 'parent_id' => 1]),
    new Node(['id' => 5, 'parent_id' => 1]),
    new Node(['id' => 6, 'parent_id' => 1]),
    new Node(['id' => 7, 'parent_id' => 1])
];

foreach ($nodes as $node) {
    $node->save();
}

Node::find(7)->getFirstSibling()->id; // 2
Node::find(7)->getSiblingAt(0); // 2
Node::find(2)->getLastSibling(); // 7
Node::find(7)->getPrevSibling()->id; // 6
Node::find(7)->getPrevSiblings()->pluck('id')->toArray(); // [2, 3, 4, 5, 6]
Node::find(7)->countPrevSiblings(); // 5
Node::find(7)->hasPrevSiblings(); // true

Node::find(2)->getNextSibling()->id; // 3
Node::find(2)->getNextSiblings()->pluck('id')->toArray(); // [3, 4, 5, 6, 7]
Node::find(2)->countNextSiblings(); // 5
Node::find(2)->hasNextSiblings(); // true

Node::find(3)->getSiblings()->pluck('id')->toArray(); // [2, 4, 5, 6, 7]
Node::find(3)->getNeighbors()->pluck('id')->toArray(); // [2, 4]
Node::find(3)->countSiblings(); // 5
Node::find(3)->hasSiblings(); // true

Node::find(2)->getSiblingsRange(2)->pluck('id')->toArray(); // [4, 5, 6, 7]
Node::find(2)->getSiblingsRange(2, 4)->pluck('id')->toArray(); // [4, 5, 6]

Node::find(4)->addSibling(new Node(['id' => 8]));
Node::find(4)->getNextSiblings()->pluck('id')->toArray(); // [5, 6, 7, 8]

Node::find(4)->addSibling(new Node(['id' => 9]), 1);
Node::find(1)->getChildren()->pluck('position', 'id')->toArray();
// [2 => 0, 9 => 1, 3 => 2, 4 => 3, 5 => 4, 6 => 5, 7 => 6, 8 => 7]

Node::find(8)->addSiblings([new Node(['id' => 10]), new Node(['id' => 11])]);
Node::find(1)->getChildren()->pluck('position', 'id')->toArray();
// [2 => 0, 9 => 1, 3 => 2, 4 => 3, 5 => 4, 6 => 5, 7 => 6, 8 => 7, 10 => 8, 11 => 9]

Node::find(2)->addSiblings([new Node(['id' => 12]), new Node(['id' => 13])], 3);
Node::find(1)->getChildren()->pluck('position', 'id')->toArray();
// [2 => 0, 9 => 1, 3 => 2, 12 => 3, 13 => 4, 4 => 5, 5 => 6, 6 => 7, 7 => 8, 8 => 9, 10 => 10, 11 => 11]

Tree

<?php
Node::createFromArray([
    'id' => 1,
    'children' => [
        [
            'id' => 2,
            'children' => [
                [
                    'id' => 3,
                    'children' => [
                        [
                            'id' => 4,
                            'children' => [
                                [
                                    'id' => 5,
                                    'children' => [
                                        [
                                            'id' => 6,
                                        ]
                                    ]
                                ]
                            ]
                        ]
                    ]
                ]
            ]
        ]
    ]
]);

Node::find(4)->deleteSubtree();
Node::find(1)->getDescendants()->pluck('id')->toArray(); // [2, 3, 4]

Node::find(4)->deleteSubtree(true);
Node::find(1)->getDescendants()->pluck('id')->toArray(); // [2, 3]

There are several methods that have been deprecated since ClosureTable 6:

-Node::getTree();
-Node::getTreeByQuery(...);
-Node::getTreeWhere('foo', '=', 'bar');
+Node::where('foo', '=', 'bar')->get()->toTree();

Collection methods

This library uses an extended collection class which offers some convenient methods:

<?php
Node::createFromArray([
    'id' => 1,
    'children' => [
        ['id' => 2],
        ['id' => 3],
        ['id' => 4],
        ['id' => 5],
        [
            'id' => 6,
            'children' => [
                ['id' => 7],
                ['id' => 8],
            ]
        ],
    ]
]);

/** @var Franzose\ClosureTable\Extensions\Collection $children */
$children = Node::find(1)->getChildren();
$children->getChildAt(1)->id; // 3
$children->getFirstChild()->id; // 2
$children->getLastChild()->id; // 6
$children->getRange(1)->pluck('id')->toArray(); // [3, 4, 5, 6]
$children->getRange(1, 3)->pluck('id')->toArray(); // [3, 4, 5]
$children->getNeighbors(2)->pluck('id')->toArray(); // [3, 5]
$children->getPrevSiblings(2)->pluck('id')->toArray(); // [2, 3]
$children->getNextSiblings(2)->pluck('id')->toArray(); // [5, 6]
$children->getChildrenOf(4)->pluck('id')->toArray(); // [7, 8]
$children->hasChildren(4); // true
$tree = $children->toTree();