Save.php

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<?php
namespace Magento\SalesRule\Controller\Adminhtml\Promo\Quote;

class Save extends \Magento\SalesRule\Controller\Adminhtml\Promo\Quote
{
    public function execute()
    {
        if ($this->getRequest()->getPostValue()) {
            try {
                $model = $this->_objectManager->create(\Magento\SalesRule\Model\Rule::class);
                $this->_eventManager->dispatch(
                    'adminhtml_controller_salesrule_prepare_save',
                    ['request' => $this->getRequest()]
                );
                $data = $this->getRequest()->getPostValue();

                $filterValues = ['from_date' => $this->_dateFilter];
                if ($this->getRequest()->getParam('to_date')) {
                    $filterValues['to_date'] = $this->_dateFilter;
                }
                $inputFilter = new \Zend_Filter_Input(
                    $filterValues,
                    [],
                    $data
                );
                $data = $inputFilter->getUnescaped();
                $id = $this->getRequest()->getParam('rule_id');
                if ($id) {
                    $model->load($id);
                    if ($id != $model->getId()) {
                        throw new \Magento\Framework\Exception\LocalizedException(__('The wrong rule is specified.'));
                    }
                }

                $session = $this->_objectManager->get(\Magento\Backend\Model\Session::class);

                $validateResult = $model->validateData(new \Magento\Framework\DataObject($data));
                if ($validateResult !== true) {
                    foreach ($validateResult as $errorMessage) {
                        $this->messageManager->addErrorMessage($errorMessage);
                    }
                    $session->setPageData($data);
                    $this->_redirect('sales_rule/*/edit', ['id' => $model->getId()]);
                    return;
                }

                if (isset(
                    $data['simple_action']
                ) && $data['simple_action'] == 'by_percent' && isset(
                    $data['discount_amount']
                )
                ) {
                    $data['discount_amount'] = min(100, $data['discount_amount']);
                }
                if (isset($data['rule']['conditions'])) {
                    $data['conditions'] = $data['rule']['conditions'];
                }
                if (isset($data['rule']['actions'])) {
                    $data['actions'] = $data['rule']['actions'];
                }
                unset($data['rule']);
                $model->loadPost($data);

                $useAutoGeneration = (int)(
                    !empty($data['use_auto_generation']) && $data['use_auto_generation'] !== 'false'
                );
                $model->setUseAutoGeneration($useAutoGeneration);

                $session->setPageData($model->getData());

                $model->save();
                $this->messageManager->addSuccessMessage(__('You saved the rule.'));
                $session->setPageData(false);
                if ($this->getRequest()->getParam('back')) {
                    $this->_redirect('sales_rule/*/edit', ['id' => $model->getId()]);
                    return;
                }
                $this->_redirect('sales_rule/*/');
                return;
            } catch (\Magento\Framework\Exception\LocalizedException $e) {
                $this->messageManager->addErrorMessage($e->getMessage());
                $id = (int)$this->getRequest()->getParam('rule_id');
                if (!empty($id)) {
                    $this->_redirect('sales_rule/*/edit', ['id' => $id]);
                } else {
                    $this->_redirect('sales_rule/*/new');
                }
                return;
            } catch (\Exception $e) {
                $this->messageManager->addErrorMessage(
                    __('Something went wrong while saving the rule data. Please review the error log.')
                );
                $this->_objectManager->get(\Psr\Log\LoggerInterface::class)->critical($e);
                $this->_objectManager->get(\Magento\Backend\Model\Session::class)->setPageData($data);
                $this->_redirect('sales_rule/*/edit', ['id' => $this->getRequest()->getParam('rule_id')]);
                return;
            }
        }
        $this->_redirect('sales_rule/*/');
    }
}