Provides shpping cart functionality for models.
Cart is a container object that holds items collection and have handy methods to work with it.
It uses user session as a cart data storage.
Add to protected/config/main.php:
<?php
'import'=>array(
'ext.yiiext.components.shoppingCart.*'
),
'components' => array(
'shoppingCart' =>
array(
'class' => 'ext.yiiext.components.shoppingCart.EShoppingCart',
),
)
[php]
$cart = Yii::createComponent(array(
'class' => 'ext.yiiext.components.shoppingCart.EShoppingCart'
));
//Important!
$cart->init();
$book = Book::model()->findByPk(1);
$cart->put($book);
Models that you are planning to put into the cart should implement IECartPosition interface:
[php]
class Book extends CActiveRecord implements IECartPosition {
public static function model($className = __CLASS__) {
return parent::model($className);
}
function getId(){
return 'Book'.$this->id;
}
function getPrice(){
return $this->price;
}
}
Adds $quantity items to the cart. If item is already in the cart, item data is being updated and item quantity is summed with $quantity.
[php]
$book = Book::model()->findByPk(1);
Yii::app()->shoppingCart->put($book); //1 item with id=1, quantity=1.
Yii::app()->shoppingCart->put($book,2); //1 item with id=1, quantity=3.
$book2 = Book::model()->findByPk(2);
Yii::app()->shoppingCart->put($book2); //2 items with id=1 and id=2.
Updates cart item. If item is already in the cart, item data is being updated and item quantity is set to $quantity. If there is no such item yet it will be added. If $quantity<1 then item will be deleted.
[php]
$book = Book::model()->findByPk(1);
Yii::app()->shoppingCart->put($book); //1 item with id=1, quantity=1.
Yii::app()->shoppingCart->update($book,2); //1 item with id=1, quantity=2.
Removes item from the cart.
[php]
$book = Book::model()->findByPk(1);
Yii::app()->shoppingCart->put($book,2); //1 item with id=1, quantity=2.
Yii::app()->shoppingCart->remove($book->getId()); //no items
Clears all cart items.
[php]
Yii::app()->shoppingCart->clear();
Returns item at key $key.
[php]
$position = Yii::app()->shoppingCart->itemAt(1);
Tells if cart contains item with id=$key.
[php]
$position = Yii::app()->shoppingCart->itemAt();
Tells if cart is empty.
[php]
$position = Yii::app()->shoppingCart->isEmpty(1);
Returns positions count.
[php]
Yii::app()->shoppingCart->put($book,2);
Yii::app()->shoppingCart->put($book2,3);
Yii::app()->shoppingCart->getCount(); //2
Returns items count.
[php]
Yii::app()->shoppingCart->put($book,2);
Yii::app()->shoppingCart->put($book2,3);
Yii::app()->shoppingCart->getItemsCount(); //5
Returns cart total.
[php]
Yii::app()->shoppingCart->put($book,2); //price=100
Yii::app()->shoppingCart->put($book2,1); //price=200
Yii::app()->shoppingCart->getCost(); //400
Returns an array with all positions.
[php]
$positions = Yii::app()->shoppingCart->getPositions();
foreach($positions as $position) {
...
}
Returns a price for a single item for this position.
[php]
$positions = Yii::app()->shoppingCart->getPositions();
foreach($positions as $position) {
$price = $position->getPrice();
}
Returns position price = single item price*items count
[php]
$book = Book::model()->findByPk(1); //price = 100
Yii::app()->shoppingCart->put($book,2); //putting 2 items
$positions = Yii::app()->shoppingCart->getPositions();
foreach($positions as $position) {
$price = $position->getSumPrice(); //200 (2*100)
}
Returns position items quantity
[php]
$book = Book::model()->findByPk(1); //price = 100
Yii::app()->shoppingCart->put($book,2); //putting 2 items
$positions = Yii::app()->shoppingCart->getPositions();
foreach($positions as $position) {
$price = $position->getQuantity(); //2
}
There is a single discount system built in. It allows to apply a set of rules that will change cart total or a single position price.
Discount is a class that implements IEDiscount and defines apply() method that describes how exactly discount is applied.
Discount is calculated by applying Position::addDiscountPrice/Position::setDiscountPrice position's method or EShoppingCart::addDiscountPrice/EShoppingCart::setDiscountPrice cart-wide method. This methods are getting one parameter that holds a value of cart total reduction or individual position reduction.
Discount class example:
[php]
class TestDiscount extends IEDiscount {
/**
* % discount
*/
public $rate = 30;
public function apply() {
foreach ($this->shoppingCart as $position) {
$quantity = $position->getQuantity();
if ($quantity > 1) {
$discountPrice = $this->rate * $position->getPrice() / 100;
$position->addDiscountPrice($discountPrice);
}
}
}
}
This example dicount works like this: if there is more than one item for a single position, there will be $rate % discount for one item and it will be applied to position price.
You can apply unlimited discount rules that will be called one by one:
[php]
'shoppingCart' =>
array(
'class' => 'ext.yiiext.components.shoppingCart.EShoppingCart',
'discounts' =>
array(
array(
'class' => 'ext.yiiext.components.shoppingCart.discounts.TestDiscount',
'rate' => 40),
array('class' => 'otherDiscount'),
),
),
There are 2 events in ShoppingCart implemented in a standard Yii way:
-
onUpdatePosition - is triggered when position is added or updated.
-
onRemovePosition - is triggered when position is deleted.
Usage:
[php]
$cN = new CallCenterNotifier();
Yii::app()->shoppingCart->attachEventHandler('onUpdatePosition',array($cN, 'updatePositionInShoppingCart'));
$book = Book::model()->findByPk(1);
Yii::app()->shoppingCart->put($book);
When onUpdatePosition event is fired, call center will be notified.
ShoppingCart is a child of CMap so you can work with the cart as an array.
[php]
$book = Book::model()->findByPk(1);
Yii::app()->shoppingCart[] = $book; //adding new position.
//iterating over all positions
foreach(Yii::app()->shoppingCart as $position)
{
...
}