Welcome to the Cookbook

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Used to move a single node down the tree. You need to provide the ID of the element to be moved and a positive number of how many positions the node should be moved down. All child nodes for the specified node will also be moved.

Here is an example of a controller action (in a controller named Categories) that moves a specified node down the tree:

function movedown($name = null, $delta = null) {
        $cat = $this->Category->findByName($name);
        if (empty($cat)) {
            $this->Session->setFlash('There is no category named ' . $name);
            $this->redirect(array('action' => 'index'), null, true);
        }
        
        $this->Category->id = $cat['Category']['id'];
        
        if ($delta > 0) {  
            $this->Category->moveDown($this->Category->id, abs($delta));
        } else {
            $this->Session->setFlash('Please provide the number of positions the field should be moved down.'); 
        }
    
        $this->redirect(array('action' => 'index'), null, true);
    }

1. function movedown($name = null, $delta = null) {
2. $cat = $this->Category->findByName($name);
3. if (empty($cat)) {
4. $this->Session->setFlash('There is no category named ' . $name);
5. $this->redirect(array('action' => 'index'), null, true);
6. }
8. $this->Category->id = $cat['Category']['id'];
10. if ($delta > 0) {
11. $this->Category->moveDown($this->Category->id, abs($delta));
12. } else {
13. $this->Session->setFlash('Please provide the number of positions the field should be moved down.');
14. }
16. $this->redirect(array('action' => 'index'), null, true);
17. }

For example, if you'd like to move the "Sport" category one position down, you would request: /categories/movedown/Sport/1.

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Used to move a single node up the tree. You need to provide the ID of the element to be moved and a positive number of how many positions the node should be moved up. All child nodes will also be moved.

Here's an example of a controller action (in a controller named Categories) that moves a node up the tree:

function moveup($name = null, $delta = null){
        $cat = $this->Category->findByName($name);
        if (empty($cat)) {
            $this->Session->setFlash('There is no category named ' . $name);
            $this->redirect(array('action' => 'index'), null, true);
        }
        
        $this->Category->id = $cat['Category']['id'];
        
        if ($delta > 0) {  
            $this->Category->moveup($this->Category->id, abs($delta));
        } else {
            $this->Session->setFlash('Please provide a number of positions the category should be moved up.'); 
        }
    
        $this->redirect(array('action' => 'index'), null, true);
    
    }

1. function moveup($name = null, $delta = null){
2. $cat = $this->Category->findByName($name);
3. if (empty($cat)) {
4. $this->Session->setFlash('There is no category named ' . $name);
5. $this->redirect(array('action' => 'index'), null, true);
6. }
8. $this->Category->id = $cat['Category']['id'];
10. if ($delta > 0) {
11. $this->Category->moveup($this->Category->id, abs($delta));
12. } else {
13. $this->Session->setFlash('Please provide a number of positions the category should be moved up.');
14. }
16. $this->redirect(array('action' => 'index'), null, true);
18. }

For example, if you would like to move the category "Gwendolyn" up one position you would request /categories/moveup/Gwendolyn/1. Now the order of Friends will be Gwendolyn, Gerald.

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removeFromTree($id=null, $delete=false)

Using this method wil either delete or move a node but retain its sub-tree, which will be reparented one level higher. It offers more control than delete(), which for a model using the tree behavior will remove the specified node and all of its children.

Taking the following tree as a starting point:

• My Categories
  • Fun
    • Sport
      • Surfing
      • Extreme knitting
      • Skating

Running the following code with the id for 'Sport'

$this->Node->removeFromTree($id); 

1. $this->Node->removeFromTree($id);

The Sport node will be become a top level node:

• My Categories
  • Fun
    • Surfing
    • Extreme knitting
    • Skating
• Sport Moved

This demonstrates the default behavior of removeFromTree of moving the node to have no parent, and re-parenting all children.

If however the following code snippet was used with the id for 'Sport'

$this->Node->removeFromTree($id,true); 

1. $this->Node->removeFromTree($id,true);

The tree would become

• My Categories
  • Fun
    • Surfing
    • Extreme knitting
    • Skating

This demonstrates the alternate use for removeFromTree, the children have been reparented and 'Sport' has been deleted.

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This method can be used to sort hierarchical data.