/**
* prepare the collection
* @return $this
*/
protected function _prepareCollection()
{
/** @var \Mageplaza\Blog\Model\ResourceModel\Topic\Collection $collection */
$collection = $this->topicCollectionFactory->create();
if ($this->getPost()->getId()) {
$constraint = 'related.post_id=' . $this->getPost()->getId();
} else {
$constraint = 'related.post_id=0';
}
$collection->getSelect()->joinLeft(['related' => $collection->getTable('mageplaza_blog_post_topic')], 'related.topic_id=main_table.topic_id AND ' . $constraint, ['position']);
$this->setCollection($collection);
parent::_prepareCollection();
return $this;
}
/**
* execute action
*
* @return \Magento\Backend\Model\View\Result\Redirect
*/
public function execute()
{
$collection = $this->filter->getCollection($this->collectionFactory->create());
$delete = 0;
foreach ($collection as $item) {
/** @var \Mageplaza\Blog\Model\Topic $item */
$item->delete();
$delete++;
}
$this->messageManager->addSuccess(__('A total of %1 record(s) have been deleted.', $delete));
/** @var \Magento\Backend\Model\View\Result\Redirect $resultRedirect */
$resultRedirect = $this->resultFactory->create(\Magento\Framework\Controller\ResultFactory::TYPE_REDIRECT);
return $resultRedirect->setPath('*/*/');
}
/**
* @return \Mageplaza\Blog\Model\ResourceModel\Topic\Collection
*/
public function getSelectedTopicsCollection()
{
if (is_null($this->topicCollection)) {
$collection = $this->topicCollectionFactory->create();
$collection->join('mageplaza_blog_post_topic', 'main_table.topic_id=mageplaza_blog_post_topic.topic_id AND mageplaza_blog_post_topic.post_id=' . $this->getId(), ['position']);
$this->topicCollection = $collection;
}
return $this->topicCollection;
}