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<?php |
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namespace app\components; |
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use Yii; |
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use yii\web\Session; |
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use yii\base\Component; |
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use yii\db\ActiveRecordInterface; |
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/** |
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* Class BasketComponent |
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* |
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* @property Session $sessionManager |
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* |
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* @package app\components |
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*/ |
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class BasketComponent extends Component |
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{ |
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/** |
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* Session manager. |
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* |
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* @var Session |
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*/ |
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private $sessionManager; |
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/** |
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* @var string |
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*/ |
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private $containerName = 'basket'; |
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/** |
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* @var string|ActiveRecordInterface |
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*/ |
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private $modelClass; |
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/** |
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* @var string |
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*/ |
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private $modelPrimaryKey = 'id'; |
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/** |
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* @var string |
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*/ |
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private $modelAmountKey = 'price'; |
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/** |
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* @var array |
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*/ |
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private $modelAdditionKeys = []; |
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/** |
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* @var null|array |
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*/ |
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private $sessionData = null; |
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/** |
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* Initialize. |
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*/ |
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public function init() |
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{ |
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if (null === $this->sessionManager) { |
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$this->setSessionManager(Yii::$app->session); |
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} |
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} |
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/** |
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* Set sessionManager. |
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* |
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* @param Session $sessionManager |
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*/ |
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public function setSessionManager(Session $sessionManager): void |
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{ |
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$this->sessionManager = $sessionManager; |
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} |
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/** |
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* @param string $name |
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*/ |
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public function setContainerName(string $name): void |
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{ |
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$this->containerName = $name; |
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} |
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/** |
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* @param string $modelClass |
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* @throws \Exception |
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*/ |
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public function setModelClass(string $modelClass): void |
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{ |
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$userModelInterfaces = class_implements($modelClass); |
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if (!isset($userModelInterfaces[ActiveRecordInterface::class])) { |
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throw new \Exception('Model class must be implemented from "'.ActiveRecordInterface::class.'".'); |
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} |
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$this->modelClass = $modelClass; |
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} |
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/** |
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* @param string $modelPrimaryKey |
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*/ |
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public function setModelPrimaryKey(string $modelPrimaryKey): void |
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{ |
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$this->modelPrimaryKey = $modelPrimaryKey; |
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} |
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/** |
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* @param string $modelAmountKey |
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*/ |
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public function setModelAmountKey(string $modelAmountKey): void |
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{ |
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$this->modelAmountKey = $modelAmountKey; |
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} |
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/** |
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* @param array $modelAdditionKeys |
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*/ |
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public function setModelAdditionKeys(array $modelAdditionKeys): void |
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{ |
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$this->modelAdditionKeys = $modelAdditionKeys; |
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} |
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/** |
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* @return mixed |
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*/ |
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public function retrieveSessionData() |
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{ |
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if ($this->sessionData == null) { |
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$this->sessionData = $this->sessionManager->get($this->containerName); |
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} |
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return $this->sessionData; |
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} |
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/** |
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* @param array|null $sessionData |
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*/ |
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public function fillSessionData(array $sessionData = null): void |
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{ |
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$this->sessionManager->set($this->containerName, $sessionData); |
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$this->sessionData = $sessionData; |
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} |
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/** |
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* @param int $modelId |
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* @param int $count |
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* @return bool |
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* @throws \Exception |
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*/ |
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public function putToBasket(int $modelId, int $count = 1): bool |
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{ |
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$sessionData = $this->retrieveSessionData(); |
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if (!empty($sessionData) && !is_array($sessionData)) { |
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throw new \Exception('Session data must be an array.'); |
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} |
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if (empty($sessionData)) { |
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$sessionData = [ |
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$modelId => $count |
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]; |
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} else if (isset($sessionData[$modelId])) { |
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$sessionData[$modelId] += $count; |
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} else { |
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$sessionData[$modelId] = $count; |
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} |
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$this->fillSessionData($sessionData); |
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$result = $this->retrieveSessionData(); |
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if (empty($result)) { |
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throw new \Exception('Session storage is not full.'); |
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} |
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if (!isset($result[$modelId])) { |
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throw new \Exception('Order item is not set to storage.'); |
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} |
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return true; |
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} |
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/** |
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* @param int $modelId |
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* @param int $count |
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* @return bool |
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* @throws \Exception |
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*/ |
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public function setCountInBasket(int $modelId, int $count): bool |
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{ |
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$sessionData = $this->retrieveSessionData(); |
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if (empty($sessionData)) { |
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throw new \Exception('Session storage is empty.'); |
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} |
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if (!is_array($sessionData)) { |
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throw new \Exception('Session data must be an array.'); |
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} |
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if (!isset($sessionData[$modelId])) { |
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throw new \Exception('Order item not found in a storage.'); |
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} |
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$sessionData[$modelId] = $count; |
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$this->fillSessionData($sessionData); |
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return true; |
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} |
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/** |
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* @param int $modelId |
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* @return bool |
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* @throws \Exception |
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*/ |
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public function removeFromBasket(int $modelId): bool |
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{ |
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$sessionData = $this->retrieveSessionData(); |
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if (empty($sessionData)) { |
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throw new \Exception('Session storage is already empty.'); |
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} |
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if (!is_array($sessionData)) { |
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throw new \Exception('Session data must be an array.'); |
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} |
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if (!isset($sessionData[$modelId])) { |
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throw new \Exception('Order item not found in a storage.'); |
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} |
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if (count($sessionData) > 1) { |
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unset($sessionData[$modelId]); |
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$this->fillSessionData($sessionData); |
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} else { |
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$this->clearBasket(); |
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} |
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return true; |
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} |
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/** |
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* Clear basket. |
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*/ |
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public function clearBasket(): void |
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{ |
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$this->sessionManager->remove($this->containerName); |
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$this->sessionData = null; |
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} |
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/** |
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* @return int |
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*/ |
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public function getTotalCount(): int |
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{ |
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$sessionData = $this->retrieveSessionData(); |
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if (empty($sessionData)) { |
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return 0; |
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} |
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return array_sum(array_values($sessionData)); |
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} |
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/** |
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* @return float |
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*/ |
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public function getTotalAmount(): float |
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{ |
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return $this->calculateTotalAmount($this->getModelItems()); |
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} |
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/** |
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* @param array $modelItems |
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* @return float |
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*/ |
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public function calculateTotalAmount(array $modelItems): float |
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{ |
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$sessionData = $this->retrieveSessionData(); |
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if (empty($sessionData)) { |
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return 0; |
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} |
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$amount = 0; |
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foreach ($modelItems as $item) { |
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$amount += ($item->{$this->modelAmountKey} * $sessionData[$item->{$this->modelPrimaryKey}]); |
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} |
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return $amount; |
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} |
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/** |
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* @return array |
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*/ |
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public function getModelItems(): array |
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{ |
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$sessionData = $this->retrieveSessionData(); |
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if (empty($sessionData)) { |
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return []; |
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} |
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$modelClass = $this->modelClass; |
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$modelItems = []; |
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$selection = [$this->modelPrimaryKey, $this->modelAmountKey]; |
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foreach ($this->modelAdditionKeys as $additionKey) { |
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$selection[] = $additionKey; |
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} |
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$models = $modelClass::find()->where(['in', $this->modelPrimaryKey, array_keys($sessionData)])->select($selection)->all(); |
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foreach ($models as $model) { |
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$modelItems[$model->{$this->modelPrimaryKey}] = $model; |
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} |
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return $modelItems; |
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} |
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} |
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