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Dependency Injection

RedBeanPHP 3.2 and higher supports Dependency Injection. Dependency Injection is a way to keep your models free from dependencies, reducing coupling. Here is how DI works in RedBeanPHP:


    //Dependencies
    class Dependency_Coffee {}
    class Dependency_Cocoa {}

    //The model that needs these things
    class Model_Geek extends RedBean_SimpleModel {
    private $cocoa;
    private $coffee;
    public function setCoffee(Dependency_Coffee $coffee) {
        $this->coffee = $coffee;
    }
    public function setCocoa(Dependency_Cocoa $cocoa) {
        $this->cocoa = $cocoa;
    }
    public function getCoffee() {
        return $this->coffee;
    }
    ..same for cocoa..
    }

First, we need to tell RedBeanPHP we would like to use DI. RedBeanPHP ships with a very decent injector which can be extended if necessary:


    $di = new RedBean_DependencyInjector;
    RedBean_ModelHelper::setDependencyInjector( $di );

Now, add the services to your injector:


    $di->addDependency('Coffee',new Dependency_Coffee);
    $di->addDependency('Cocoa',new Dependency_Cocoa);

That's all. Let's get our caffeinated geek!


    $geek = R::dispense('geek');
    $coffee = $geek->getCoffee(); //returns the coffee

This is how dependency injection in RedBeanPHP 3.2 and higher works. If you need even more flexibility you can override the getModelForBean( $bean ) method in the Bean Helper, this method returns the model for the bean. Here you can bootstrap your own dependency injector. In this method you can call RedBean_ModelHelper::factory($modelName) to obtain a model (and it's dependencies).


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