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I want to create a module that read reviews data from database table in magento and display it in the form of json. How can i read data from database in magento?

1 Answer 1

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To retrieve the review collection you can use \Magento\Review\Model\ResourceModel\Review\Product\Collection as unfortunately, as of now, Magento 2 does not provide a service layer for the Review module.

You can inject this class in your constructor:

protected $_productsFactory;

public function __construct(
    ...
    \Magento\Review\Model\ResourceModel\Review\Product\CollectionFactory $productsFactory,
    ...
) {
    ...
    $this->_productsFactory = $productsFactory;
    ...
}

Then you can call the following to get the collection:

$collection = $this->_productsFactory->create();

If you only want data for one product you can add:

$collection->addEntityFilter($productId);

Now to encode in JSON you need to inject the \Magento\Framework\Json\Helper\Data class in your constructor:

protected $_productsFactory;

protected $_jsonHelper;

public function __construct(
    ...
    \Magento\Review\Model\ResourceModel\Review\Product\CollectionFactory $productsFactory,
    \Magento\Framework\Json\Helper\Data $jsonHelper,
    ...
) {
    ...
    $this->_productsFactory = $productsFactory;
    $this->_jsonHelper = $jsonHelper;
    ...
}

Now in order to return a proper JSON I suggest you generate an array from the collection based on the data you need:

$result = [];
foreach ($collection as $review) {
    $result[] = ['title' => $review->getTitle(), 'nickname' => $review->getNickname(), 'detail' => $review->getDetail()];
}
$this->jsonHelper->jsonEncode($result);
17
  • So u r saying that i cannot access the review_detail table to get the list of reviews?? Commented Jun 13, 2016 at 7:20
  • @RahulAgrawal no that's not what I'm saying, what I posted will let you retrieve the list of reviews Commented Jun 13, 2016 at 7:20
  • @RahulAgrawal I'm saying that you will have to use the model factory instead of the service contracts Commented Jun 13, 2016 at 7:21
  • from where do i call the collection part Commented Jun 13, 2016 at 7:26
  • and i want the review of all the products Commented Jun 13, 2016 at 7:27

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