Class Behavior
Base class for behaviors.
Behaviors allow you to simulate mixins, and create reusable blocks of application logic, that can be reused across several models. Behaviors also provide a way to hook into model callbacks and augment their behavior.
Mixin methods
Behaviors can provide mixin like features by declaring public methods. These methods will be accessible on the tables the behavior has been added to.
function doSomething($arg1, $arg2) { // do something }
Would be called like $table->doSomething($arg1, $arg2);
.
Callback methods
Behaviors can listen to any events fired on a Table. By default CakePHP provides a number of lifecycle events your behaviors can listen to:
-
beforeFind(Event $event, Query $query, ArrayObject $options, boolean $primary)
Fired before each find operation. By stopping the event and supplying a return value you can bypass the find operation entirely. Any changes done to the $query instance will be retained for the rest of the find. The $primary parameter indicates whether or not this is the root query, or an associated query. -
buildValidator(Event $event, Validator $validator, string $name)
Fired when the validator object identified by $name is being built. You can use this callback to add validation rules or add validation providers. -
buildRules(Event $event, RulesChecker $rules)
Fired when the rules checking object for the table is being built. You can use this callback to add more rules to the set. -
beforeRules(Event $event, EntityInterface $entity, ArrayObject $options, $operation)
Fired before an entity is validated using by a rules checker. By stopping this event, you can return the final value of the rules checking operation. -
afterRules(Event $event, EntityInterface $entity, ArrayObject $options, bool $result, $operation)
Fired after the rules have been checked on the entity. By stopping this event, you can return the final value of the rules checking operation. -
beforeSave(Event $event, EntityInterface $entity, ArrayObject $options)
Fired before each entity is saved. Stopping this event will abort the save operation. When the event is stopped the result of the event will be returned. -
afterSave(Event $event, EntityInterface $entity, ArrayObject $options)
Fired after an entity is saved. -
beforeDelete(Event $event, EntityInterface $entity, ArrayObject $options)
Fired before an entity is deleted. By stopping this event you will abort the delete operation. -
afterDelete(Event $event, EntityInterface $entity, ArrayObject $options)
Fired after an entity has been deleted.
In addition to the core events, behaviors can respond to any event fired from your Table classes including custom application specific ones.
You can set the priority of a behaviors callbacks by using the priority
setting when attaching a behavior. This will set the priority for all the callbacks a behavior provides.
Finder methods
Behaviors can provide finder methods that hook into a Table's find() method. Custom finders are a great way to provide preset queries that relate to your behavior. For example a SluggableBehavior could provide a find('slugged') finder. Behavior finders are implemented the same as other finders. Any method starting with find
will be setup as a finder. Your finder methods should expect the following arguments:
findSlugged(Query $query, array $options)
- Cake\ORM\Behavior implements Cake\Event\EventListenerInterface uses Cake\Core\InstanceConfigTrait
Direct known subclasses
Cake\ORM\Behavior\CounterCacheBehavior, Cake\ORM\Behavior\TimestampBehavior, Cake\ORM\Behavior\TranslateBehavior, Cake\ORM\Behavior\TreeBehaviorSee:
Cake\ORM\Table::addBehavior()
See:
Cake\Event\EventManager
Located at ORM/Behavior.php
Method Detail
__constructsource public
__construct( Cake\ORM\Table $table , array $config [] )
Constructor
Merges config with the default and store in the config property
Parameters
-
Cake\ORM\Table
$table
- The table this behavior is attached to.
- array
$config
optional [] - The config for this behavior.
_reflectionCachesource protected
_reflectionCache( )
Gets the methods implemented by this behavior
Uses the implementedEvents() method to exclude callback methods. Methods starting with _
will be ignored, as will methods declared on Cake\ORM\Behavior
Returns
array
array
_resolveMethodAliasessource protected
_resolveMethodAliases( string $key , array $defaults , array $config )
Removes aliased methods that would otherwise be duplicated by userland configuration.
Parameters
- string
$key
- The key to filter.
- array
$defaults
- The default method mappings.
- array
$config
- The customized method mappings.
Returns
array
A de-duped list of config data.
implementedEventssource public
implementedEvents( )
Gets the Model callbacks this behavior is interested in.
By defining one of the callback methods a behavior is assumed to be interested in the related event.
Override this method if you need to add non-conventional event listeners. Or if you want your behavior to listen to non-standard events.
Returns
array
array
Implementation of
Cake\Event\EventListenerInterface::implementedEvents()
implementedFinderssource public
implementedFinders( )
implementedFinders
Provides an alias->methodname map of which finders a behavior implements. Example:
[ 'this' => 'findThis', 'alias' => 'findMethodName' ]
With the above example, a call to $Table->find('this')
will call $Behavior->findThis()
and a call to $Table->find('alias')
will call $Behavior->findMethodName()
It is recommended, though not required, to define implementedFinders in the config property of child classes such that it is not necessary to use reflections to derive the available method list. See core behaviors for examples
Returns
array
array
implementedMethodssource public
implementedMethods( )
implementedMethods
Provides an alias->methodname map of which methods a behavior implements. Example:
[ 'method' => 'method', 'aliasedmethod' => 'somethingElse' ]
With the above example, a call to $Table->method()
will call $Behavior->method()
and a call to $Table->aliasedmethod()
will call $Behavior->somethingElse()
It is recommended, though not required, to define implementedFinders in the config property of child classes such that it is not necessary to use reflections to derive the available method list. See core behaviors for examples
Returns
array
array
initializesource public
initialize( array $config )
Constructor hook method.
Implement this method to avoid having to overwrite the constructor and call parent.
Parameters
- array
$config
- The configuration settings provided to this behavior.
verifyConfigsource public
verifyConfig( )
verifyConfig
Checks that implemented keys contain values pointing at callable.
Throws
Cake\Core\Exception\Exception
if config are invalid
Methods used from Cake\Core\InstanceConfigTrait
_configDeletesource protected
_configDelete( string $key )
Delete a single config key
Parameters
- string
$key
- Key to delete.
Throws
Cake\Core\Exception\Exception
if attempting to clobber existing config
_configReadsource protected
_configRead( string|null $key )
Read a config variable
Parameters
- string|null
$key
- Key to read.
Returns
mixed
mixed
_configWritesource protected
_configWrite( string|array $key , mixed $value , boolean|string $merge false )
Write a config variable
Parameters
- string|array
$key
- Key to write to.
- mixed
$value
- Value to write.
- boolean|string
$merge
optional false - True to merge recursively, 'shallow' for simple merge, false to overwrite, defaults to false.
Throws
Cake\Core\Exception\Exception
if attempting to clobber existing config
configsource public
config( string|array|null $key null , mixed|null $value null , boolean $merge true )
Usage
Reading the whole config:
$this->config();
Reading a specific value:
$this->config('key');
Reading a nested value:
$this->config('some.nested.key');
Setting a specific value:
$this->config('key', $value);
Setting a nested value:
$this->config('some.nested.key', $value);
Updating multiple config settings at the same time:
$this->config(['one' => 'value', 'another' => 'value']);
Parameters
- string|array|null
$key
optional null - The key to get/set, or a complete array of configs.
- mixed|null
$value
optional null - The value to set.
- boolean
$merge
optional true - Whether to recursively merge or overwrite existing config, defaults to true.
Returns
mixed
Config value being read, or the object itself on write operations.
Throws
Cake\Core\Exception\Exception
When trying to set a key that is invalid.
configShallowsource public
configShallow( string|array $key , mixed|null $value null )
Merge provided config with existing config. Unlike config()
which does a recursive merge for nested keys, this method does a simple merge.
Setting a specific value:
$this->config('key', $value);
Setting a nested value:
$this->config('some.nested.key', $value);
Updating multiple config settings at the same time:
$this->config(['one' => 'value', 'another' => 'value']);
Parameters
- string|array
$key
- The key to set, or a complete array of configs.
- mixed|null
$value
optional null - The value to set.
Returns
mixed
$this The object itself.
Properties summary
Properties used from Cake\Core\InstanceConfigTrait
$_configInitializedsource
protected boolean
Whether the config property has already been configured with defaults
false
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http://api.cakephp.org/3.1/class-Cake.ORM.Behavior.html