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<?php namespace Arcanedev\LaravelNestedSet\Eloquent; |
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use Arcanedev\LaravelNestedSet\NodeTrait; |
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use Arcanedev\LaravelNestedSet\Utilities\NestedSet; |
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use Illuminate\Database\Eloquent\Collection as EloquentCollection; |
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use Illuminate\Database\Eloquent\Model; |
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/** |
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* Class Collection |
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* |
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* @package Arcanedev\Taxonomies\Utilities |
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* @author ARCANEDEV <[email protected]> |
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*/ |
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class Collection extends EloquentCollection |
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{ |
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/** |
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* Fill `parent` and `children` relationships for every node in the collection. |
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* |
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* This will overwrite any previously set relations. |
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* |
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* @return $this |
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*/ |
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public function linkNodes() |
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{ |
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if ($this->isEmpty()) { |
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return $this; |
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} |
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$groupedNodes = $this->groupBy($this->first()->getParentIdName()); |
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/** @var NodeTrait|Model $node */ |
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foreach ($this->items as $node) { |
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if ( ! $node->getParentId()) { |
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$node->setRelation('parent', null); |
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} |
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$children = $groupedNodes->get($node->getKey(), [ ]); |
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/** @var Model|NodeTrait $child */ |
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foreach ($children as $child) { |
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$child->setRelation('parent', $node); |
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} |
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$node->setRelation('children', EloquentCollection::make($children)); |
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} |
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return $this; |
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} |
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/** |
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* Build a tree from a list of nodes. Each item will have set children relation. |
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* To successfully build tree "id", "_lft" and "parent_id" keys must present. |
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* If `$root` is provided, the tree will contain only descendants of that node. |
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* |
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* @param mixed $root |
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* |
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* @return self |
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*/ |
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public function toTree($root = false) |
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{ |
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if ($this->isEmpty()) { |
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return new static; |
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} |
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$this->linkNodes(); |
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$items = [ ]; |
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$root = $this->getRootNodeId($root); |
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/** @var Model|NodeTrait $node */ |
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foreach ($this->items as $node) { |
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if ($node->getParentId() == $root) { |
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$items[] = $node; |
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} |
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} |
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return new static($items); |
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} |
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/** |
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* Get root node id. |
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* |
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* @param mixed $root |
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* |
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* @return int |
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*/ |
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protected function getRootNodeId($root) |
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{ |
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if (NestedSet::isNode($root)) { |
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return $root->getKey(); |
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} |
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if ($root !== false) { |
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return $root; |
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} |
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// If root node is not specified we take parent id of node with |
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// least lft value as root node id. |
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$leastValue = null; |
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/** @var Model|NodeTrait $node */ |
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foreach ($this->items as $node) { |
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if ($leastValue === null || $node->getLft() < $leastValue) { |
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$leastValue = $node->getLft(); |
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$root = $node->getParentId(); |
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} |
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} |
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return $root; |
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} |
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/** |
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* Build a list of nodes that retain the order that they were pulled from the database. |
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* |
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* @return self |
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*/ |
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public function toFlattenedTree() |
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{ |
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return $this->toTree()->flattenTree(); |
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} |
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/** |
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* Flatten a tree into a non recursive array |
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*/ |
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public function flattenTree() |
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{ |
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$items = []; |
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foreach ($this->items as $node) { |
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$items = array_merge($items, $this->flattenNode($node)); |
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} |
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return new static($items); |
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} |
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/* ------------------------------------------------------------------------------------------------ |
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138
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| Other Functions |
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139
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| ------------------------------------------------------------------------------------------------ |
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*/ |
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141
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/** |
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* Flatten a single node |
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* |
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* @param \Arcanedev\LaravelNestedSet\NodeTrait $node |
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* |
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* @return array |
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*/ |
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protected function flattenNode($node) |
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{ |
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$items = []; |
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$items[] = $node; |
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foreach ($node->children as $childNode) { |
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$items = array_merge($items, $this->flattenNode($childNode)); |
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} |
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return $items; |
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} |
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} |
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ARCANEDEV /
LaravelNestedSet
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