cakephp 组件中访问控制器的实例
如果你想在控制器的beforeFilter()之前干点什么的话，initialize()方法是最合适的选择。
<?php
class CheckComponent extends Object {
//在Controller::beforeFilter()之前被调用
function initialize(&$controller) {
// saving the controller reference for later use
$this->controller =& $controller;
}
//在Controller::beforeFilter()之后被调用
function startup(&$controller) {
}
function redirectSomewhere($value) {
// 使用控制器的方法
$this->controller->redirect($value);
}
}
?>
<?php
class CheckComponent extends Object {
//在Controller::beforeFilter()之前被调用
function initialize(&$controller) {
// saving the controller reference for later use
$this->controller =& $controller;
}
//在Controller::beforeFilter()之后被调用
function startup(&$controller) {
}
function redirectSomewhere($value) {
// 使用控制器的方法
$this->controller->redirect($value);
}
}
?>
有时候你也许会需要在组件中使用其他的组件，你只需要在组件中声明类成员变量$components(就像在控制器中一样)，他的值是一个你想使用的组件名的数组。
<?php
class MyComponent extends Object {
// 需要使用的其他组件
var $components = array('Session', 'Math');
function doStuff() {
$result = $this->Math->doComplexOperation(1, 2);
$this->Session->write('stuff', $result);
}
}
?>
<?php
class MyComponent extends Object {
// 需要使用的其他组件
var $components = array('Session', 'Math');
function doStuff() {
$result = $this->Math->doComplexOperation(1, 2);
$this->Session->write('stuff', $result);
}
}
?>
在组件中使用或者访问模型(model)并不是很推荐；不过这种可能性也不是没有，在这种情况下，你需要手动的生成模型的实例进行使用。下面是一个例子：
<?php
class MathComponent extends Object {
function doComplexOperation($amount1, $amount2) {
return $amount1 + $amount2;
}
function doUberComplexOperation ($amount1, $amount2) {
$userInstance = ClassRegistry::init('User');
$totalUsers = $userInstance->find('count');
return ($amount1 + $amount2) / $totalUsers;
}
}
?>
<?php
class MathComponent extends Object {
function doComplexOperation($amount1, $amount2) {
return $amount1 + $amount2;
}
function doUberComplexOperation ($amount1, $amount2) {
$userInstance = ClassRegistry::init('User');
$totalUsers = $userInstance->find('count');
return ($amount1 + $amount2) / $totalUsers;
}
}
?>
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3.6.3.3 Using other Components in your Component
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Sometimes one of your components may need to use another.
You can include other components in your component the exact same way you include them in controllers: Use the$componentsvar.
<?php
class CustomComponent extends Object {
var $name = "Custom"; // the name of your component
var $components = array( "Existing" ); // the other component your component uses
function initialize(&$controller) {
$this->Existing->foo();
}
function bar() {
// ...
}
}
?>
<?php
class CustomComponent extends Object {
var $name = "Custom"; // the name of your component
var $components = array( "Existing" ); // the other component your component uses
function initialize(&$controller) {
$this->Existing->foo();
}
function bar() {
// ...
}
}
?>
<?php
class ExistingComponent extends Object {
var $name = "Existing";
function initialize(&$controller) {
$this->Parent->bar();
}
function foo() {
// ...
}
}
?>
<?php
class ExistingComponent extends Object {
var $name = "Existing";
function initialize(&$controller) {
$this->Parent->bar();
}
function foo() {
// ...
}
}
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