Class TreeBehavior

Tree Behavior.

Enables a model object to act as a node-based tree. Using Modified Preorder Tree Traversal

Object

TreeBehavior

Package: Cake\Model\Behavior
See: http://en.wikipedia.org/wiki/Tree_traversal
Link: http://book.cakephp.org/2.0/en/core-libraries/behaviors/tree.html
Copyright: Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
License: MIT License
Location: Cake/Model/Behavior/TreeBehavior.php

Properties summary

$_defaults protected

array

Defaults
$_deletedRow protected

array

Used to preserve state between delete callbacks.
$errors public

array

Errors

Inherited Properties

mapMethods, settings

Method Summary

_getMax() protected

get the maximum index value in the table.
_getMin() protected

get the minimum index value in the table.
_setParent() protected

Sets the parent of the given node
_sync() protected

Table sync method.
afterDelete() public

After delete method.
afterSave() public

After save method. Called after all saves
beforeDelete() public

Stores the record about to be deleted.
beforeFind() public

Runs before a find() operation
beforeSave() public

Before save method. Called before all saves
childCount() public

Get the number of child nodes
children() public

Get the child nodes of the current model
generateTreeList() public

A convenience method for returning a hierarchical array used for HTML select boxes
getParentNode() public

Get the parent node
getPath() public

Get the path to the given node
moveDown() public

Reorder the node without changing the parent.
moveUp() public

Reorder the node without changing the parent.
recover() public

Recover a corrupted tree
removeFromTree() public

Remove the current node from the tree, and reparent all children up one level.
reorder() public

Reorder method.
setup() public

Initiate Tree behavior
verify() public

Check if the current tree is valid.

Method Detail

_getMax() protected ¶

_getMax( Model $Model , string $scope , string $right , integer $recursive = -1 , boolean $created = false )

get the maximum index value in the table.

Parameters

Model $Model
string $scope
string $right
integer $recursive optional -1
boolean $created optional false

Returns

integer

_getMin() protected ¶

_getMin( Model $Model , string $scope , string $left , integer $recursive = -1 )

get the minimum index value in the table.

Parameters

Model $Model
string $scope
string $left
integer $recursive optional -1

Returns

integer

_setParent() protected ¶

_setParent( Model $Model , integer|string $parentId = null , boolean $created = false )

Sets the parent of the given node

The force parameter is used to override the "don't change the parent to the current parent" logic in the event of recovering a corrupted table, or creating new nodes. Otherwise it should always be false. In reality this method could be private, since calling save with parent_id set also calls setParent

Parameters

Model $Model: Model instance
integer|string $parentId optional null
boolean $created optional false

Returns

boolean
true on success, false on failure

_sync() protected ¶

_sync( Model $Model , integer $shift , string $dir = '+' , array $conditions = array() , boolean $created = false , string $field = 'both' )

Table sync method.

Handles table sync operations, Taking account of the behavior scope.

Parameters

Model $Model
integer $shift
string $dir optional '+'
array $conditions optional array()
boolean $created optional false
string $field optional 'both'

afterDelete() public ¶

afterDelete( Model $Model )

After delete method.

Will delete the current node and all children using the deleteAll method and sync the table

Parameters

Model $Model: Model instance

Returns

boolean
true to continue, false to abort the delete

Overrides

ModelBehavior::afterDelete()

afterSave() public ¶

afterSave( Model $Model , boolean $created )

After save method. Called after all saves

Overridden to transparently manage setting the lft and rght fields if and only if the parent field is included in the parameters to be saved.

Parameters

Model $Model: Model instance.
boolean $created: indicates whether the node just saved was created or updated

Returns

boolean
true on success, false on failure

Overrides

ModelBehavior::afterSave()

beforeDelete() public ¶

beforeDelete( Model $Model , boolean $cascade = true )

Stores the record about to be deleted.

This is used to delete child nodes in the afterDelete.

Parameters

Model $Model: Model instance
boolean $cascade optional true

Returns

boolean

Overrides

ModelBehavior::beforeDelete()

beforeFind() public ¶

beforeFind( Model $Model , array $query )

Runs before a find() operation

Parameters

Model $Model: Model using the behavior
array $query: Query parameters as set by cake

Returns

array

Overrides

ModelBehavior::beforeFind()

beforeSave() public ¶

beforeSave( Model $Model )

Before save method. Called before all saves

Overridden to transparently manage setting the lft and rght fields if and only if the parent field is included in the parameters to be saved. For newly created nodes with NO parent the left and right field values are set directly by this method bypassing the setParent logic.

Parameters

Model $Model: Model instance

Returns

boolean
true to continue, false to abort the save

Since

1.2

Overrides

ModelBehavior::beforeSave()

childCount() public ¶

childCount( Model $Model , integer|string|boolean $id = null , boolean $direct = false )

Get the number of child nodes

If the direct parameter is set to true, only the direct children are counted (based upon the parent_id field) If false is passed for the id parameter, all top level nodes are counted, or all nodes are counted.

Parameters

Model $Model: Model instance
integer|string|boolean $id optional null: The ID of the record to read or false to read all top level nodes
boolean $direct optional false: whether to count direct, or all, children

Returns

integer
number of child nodes

Link

http://book.cakephp.org/2.0/en/core-libraries/behaviors/tree.html#TreeBehavior::childCount

children() public ¶

children( Model $Model , integer|string $id = null , boolean $direct = false , string|array $fields = null , string $order = null , integer $limit = null , integer $page = 1 , integer $recursive = null )

Get the child nodes of the current model

If the direct parameter is set to true, only the direct children are returned (based upon the parent_id field) If false is passed for the id parameter, top level, or all (depending on direct parameter appropriate) are counted.

Parameters

Model $Model: Model instance
integer|string $id optional null: The ID of the record to read
boolean $direct optional false: whether to return only the direct, or all, children
string|array $fields optional null: Either a single string of a field name, or an array of field names
string $order optional null: SQL ORDER BY conditions (e.g. "price DESC" or "name ASC") defaults to the tree order
integer $limit optional null: SQL LIMIT clause, for calculating items per page.
integer $page optional 1: Page number, for accessing paged data
integer $recursive optional null: The number of levels deep to fetch associated records

Returns

array
Array of child nodes

Link

http://book.cakephp.org/2.0/en/core-libraries/behaviors/tree.html#TreeBehavior::children

generateTreeList() public ¶

generateTreeList( Model $Model , string|array $conditions = null , string $keyPath = null , string $valuePath = null , string $spacer = '_' , integer $recursive = null )

A convenience method for returning a hierarchical array used for HTML select boxes

Parameters

Model $Model: Model instance
string|array $conditions optional null: SQL conditions as a string or as an array('field' =>'value',...)
string $keyPath optional null: A string path to the key, i.e. "{n}.Post.id"
string $valuePath optional null: A string path to the value, i.e. "{n}.Post.title"
string $spacer optional '_': The character or characters which will be repeated
integer $recursive optional null: The number of levels deep to fetch associated records

Returns

array
An associative array of records, where the id is the key, and the display field is the value

Link

http://book.cakephp.org/2.0/en/core-libraries/behaviors/tree.html#TreeBehavior::generateTreeList

getParentNode() public ¶

getParentNode( Model $Model , integer|string $id = null , string|array $fields = null , integer $recursive = null )

Get the parent node

reads the parent id and returns this node

Parameters

Model $Model: Model instance
integer|string $id optional null: The ID of the record to read
string|array $fields optional null
integer $recursive optional null: The number of levels deep to fetch associated records

Returns

array|boolean
Array of data for the parent node

Link

http://book.cakephp.org/2.0/en/core-libraries/behaviors/tree.html#TreeBehavior::getParentNode

getPath() public ¶

getPath( Model $Model , integer|string $id = null , string|array $fields = null , integer $recursive = null )

Get the path to the given node

Parameters

Model $Model: Model instance
integer|string $id optional null: The ID of the record to read
string|array $fields optional null: Either a single string of a field name, or an array of field names
integer $recursive optional null: The number of levels deep to fetch associated records

Returns

array
Array of nodes from top most parent to current node

Link

http://book.cakephp.org/2.0/en/core-libraries/behaviors/tree.html#TreeBehavior::getPath

moveDown() public ¶

moveDown( Model $Model , integer|string $id = null , integer|boolean $number = 1 )

Reorder the node without changing the parent.

If the node is the last child, or is a top level node with no subsequent node this method will return false

Parameters

Model $Model: Model instance
integer|string $id optional null: The ID of the record to move
integer|boolean $number optional 1: how many places to move the node or true to move to last position

Returns

boolean
true on success, false on failure

Link

http://book.cakephp.org/2.0/en/core-libraries/behaviors/tree.html#TreeBehavior::moveDown

moveUp() public ¶

moveUp( Model $Model , integer|string $id = null , integer|boolean $number = 1 )

Reorder the node without changing the parent.

If the node is the first child, or is a top level node with no previous node this method will return false

Parameters

Model $Model: Model instance
integer|string $id optional null: The ID of the record to move
integer|boolean $number optional 1: how many places to move the node, or true to move to first position

Returns

boolean
true on success, false on failure

Link

http://book.cakephp.org/2.0/en/core-libraries/behaviors/tree.html#TreeBehavior::moveUp

recover() public ¶

recover( Model $Model , string $mode = 'parent' , string|integer $missingParentAction = null )

Recover a corrupted tree

The mode parameter is used to specify the source of info that is valid/correct. The opposite source of data will be populated based upon that source of info. E.g. if the MPTT fields are corrupt or empty, with the $mode 'parent' the values of the parent_id field will be used to populate the left and right fields. The missingParentAction parameter only applies to "parent" mode and determines what to do if the parent field contains an id that is not present.

Parameters

Model $Model: Model instance
string $mode optional 'parent': parent or tree
string|integer $missingParentAction optional null: 'return' to do nothing and return, 'delete' to delete, or the id of the parent to set as the parent_id

Returns

boolean
true on success, false on failure

Link

http://book.cakephp.org/2.0/en/core-libraries/behaviors/tree.html#TreeBehavior::recover

removeFromTree() public ¶

removeFromTree( Model $Model , integer|string $id = null , boolean $delete = false )

Remove the current node from the tree, and reparent all children up one level.

If the parameter delete is false, the node will become a new top level node. Otherwise the node will be deleted after the children are reparented.

Parameters

Model $Model: Model instance
integer|string $id optional null: The ID of the record to remove
boolean $delete optional false: whether to delete the node after reparenting children (if any)

Returns

boolean
true on success, false on failure

Link

http://book.cakephp.org/2.0/en/core-libraries/behaviors/tree.html#TreeBehavior::removeFromTree

reorder() public ¶

reorder( Model $Model , array $options = array() )

Reorder method.

Reorders the nodes (and child nodes) of the tree according to the field and direction specified in the parameters. This method does not change the parent of any node.

Requires a valid tree, by default it verifies the tree before beginning.

Options:

'id' id of record to use as top node for reordering
'field' Which field to use in reordering defaults to displayField
'order' Direction to order either DESC or ASC (defaults to ASC)
'verify' Whether or not to verify the tree before reorder. defaults to true.

Parameters

Model $Model: Model instance
array $options optional array(): array of options to use in reordering.

Returns

boolean
true on success, false on failure

Link

http://book.cakephp.org/2.0/en/core-libraries/behaviors/tree.html#TreeBehavior::reorder

setup() public ¶

setup( Model $Model , array $config = array() )

Initiate Tree behavior

Parameters

Model $Model: instance of model
array $config optional array(): array of configuration settings.

Overrides

ModelBehavior::setup()

verify() public ¶

verify( Model $Model )

Check if the current tree is valid.

Returns true if the tree is valid otherwise an array of (type, incorrect left/right index, message)

Parameters

Model $Model: Model instance

Returns

mixed

true if the tree is valid or empty, otherwise an array of (error type [index, node], [incorrect left/right index,node id], message)

Link

http://book.cakephp.org/2.0/en/core-libraries/behaviors/tree.html#TreeBehavior::verify

Methods inherited from ModelBehavior

_addToWhitelist() protected ¶

_addToWhitelist( Model $model , string $field )

If $model's whitelist property is non-empty, $field will be added to it. Note: this method should only be used in beforeValidate or beforeSave to ensure that it only modifies the whitelist for the current save operation. Also make sure you explicitly set the value of the field which you are allowing.

Parameters

Model $model: Model using this behavior
string $field: Field to be added to $model's whitelist

afterFind() public ¶

afterFind( Model $model , mixed $results , boolean $primary )

After find callback. Can be used to modify any results returned by find.

Parameters

Model $model: Model using this behavior
mixed $results: The results of the find operation
boolean $primary: Whether this model is being queried directly (vs. being queried as an association)

Returns

mixed
An array value will replace the value of $results - any other value will be ignored.

afterValidate() public ¶

afterValidate( Model $model )

afterValidate is called just after model data was validated, you can use this callback to perform any data cleanup or preparation if needed

Parameters

Model $model: Model using this behavior

Returns

mixed
False will stop this event from being passed to other behaviors

beforeValidate() public ¶

beforeValidate( Model $model )

beforeValidate is called before a model is validated, you can use this callback to add behavior validation rules into a models validate array. Returning false will allow you to make the validation fail.

Parameters

Model $model: Model using this behavior

Returns

mixed
False or null will abort the operation. Any other result will continue.

cleanup() public ¶

cleanup( Model $model )

Clean up any initialization this behavior has done on a model. Called when a behavior is dynamically detached from a model using Model::detach().

Parameters

Model $model: Model using this behavior

See

BehaviorCollection::detach()

onError() public ¶

onError( Model $model , string $error )

DataSource error callback

Parameters

Model $model: Model using this behavior
string $error: Error generated in DataSource

Methods inherited from Object

__construct() public ¶

__construct( )

constructor, no-op

_mergeVars() protected ¶

_mergeVars( array $properties , string $class , boolean $normalize = true )

Merges this objects $property with the property in $class' definition. This classes value for the property will be merged on top of $class'

This provides some of the DRY magic CakePHP provides. If you want to shut it off, redefine this method as an empty function.

Parameters

array $properties: The name of the properties to merge.
string $class: The class to merge the property with.
boolean $normalize optional true: Set to true to run the properties through Hash::normalize() before merging.

_set() protected ¶

_set( array $properties = array() )

Allows setting of multiple properties of the object in a single line of code. Will only set properties that are part of a class declaration.

Parameters

array $properties optional array(): An associative array containing properties and corresponding values.

_stop() protected ¶

_stop( integer|string $status = 0 )

Stop execution of the current script. Wraps exit() making testing easier.

Parameters

integer|string $status optional 0: see http://php.net/exit for values

dispatchMethod() public ¶

dispatchMethod( string $method , array $params = array() )

Calls a method on this object with the given parameters. Provides an OO wrapper for call_user_func_array

Parameters

string $method: Name of the method to call
array $params optional array(): Parameter list to use when calling $method

Returns

mixed
Returns the result of the method call

log() public ¶

log( string $msg , integer|string $type = LOG_ERR )

Convenience method to write a message to CakeLog. See CakeLog::write() for more information on writing to logs.

Parameters

string $msg: Log message.
integer|string $type optional LOG_ERR: Type of message being written. Either a valid LOG_* constant or a string matching the recognized levels.

Returns

boolean
Success of log write.

See

CakeLog::write()

requestAction() public ¶

requestAction( string|array $url , array $extra = array() )

Calls a controller's method from any location. Can be used to connect controllers together or tie plugins into a main application. requestAction can be used to return rendered views or fetch the return value from controller actions.

Under the hood this method uses Router::reverse() to convert the $url parameter into a string URL. You should use URL formats that are compatible with Router::reverse()

Passing POST and GET data

POST and GET data can be simulated in requestAction. Use $extra['url'] for GET data. The $extra['data'] parameter allows POST data simulation.

Parameters

string|array $url: String or array-based URL. Unlike other URL arrays in CakePHP, this URL will not automatically handle passed and named arguments in the $url parameter.
array $extra optional array(): if array includes the key "return" it sets the AutoRender to true. Can also be used to submit GET/POST data, and named/passed arguments.

Returns

mixed

Boolean true or false on success/failure, or contents of rendered action if 'return' is set in $extra.

toString() public ¶

toString( )

Object-to-string conversion. Each class can override this method as necessary.

Returns

string
The name of this class

Properties detail

`$_defaults` ¶

protected array

Defaults

array(
    'parent' => 'parent_id', 'left' => 'lft', 'right' => 'rght',
    'scope' => '1 = 1', 'type' => 'nested', '__parentChange' => false, 'recursive' => -1
)

`$_deletedRow` ¶

protected array

Used to preserve state between delete callbacks.

array()

`$errors` ¶

public array

Errors

array()

Packages

Classes

Class TreeBehavior

Properties summary

Inherited Properties

Method Summary

_getMax() protected

_getMin() protected

_setParent() protected

_sync() protected

afterDelete() public

afterSave() public

beforeDelete() public

beforeFind() public

beforeSave() public

childCount() public

children() public

generateTreeList() public

getParentNode() public

getPath() public

moveDown() public

moveUp() public

recover() public

removeFromTree() public

reorder() public

setup() public

verify() public

Method Detail

_getMax() protected ¶

Parameters

Returns

_getMin() protected ¶

Parameters

Returns

_setParent() protected ¶

Parameters

Returns

_sync() protected ¶

Parameters

afterDelete() public ¶

Parameters

Returns

Overrides

afterSave() public ¶

Parameters

Returns

Overrides

beforeDelete() public ¶

Parameters

Returns

Overrides

beforeFind() public ¶

Parameters

Returns

Overrides

beforeSave() public ¶

Parameters

Returns

Since

Overrides

childCount() public ¶

Parameters

Returns

Link

children() public ¶

Parameters

Returns

Link

generateTreeList() public ¶

Parameters

Returns

Link

getParentNode() public ¶

Parameters

Returns

Link

getPath() public ¶

Parameters

Returns

Link

`$_defaults` ¶