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Magento2 product collection returning empty value instead of 0 (zeros)

I built my own product collection which I use for my own shop dashboard. What it should do is for each selected product to go through the last 13 months and show me the amount that was sold.

...     public function __construct(     \Magento\Sales\Model\ResourceModel\Report\Bestsellers\CollectionFactory $  collectionFactory, // for bestseller     ...     array $  data = [] ) { $  this->_collectionFactory = $  collectionFactory; ... parent::__construct($  context, $  data); } 

and here is the function

public function getMonthCollection($  from, $  to)  {     $  bestSellerProdcutCollection = $  this->_collectionFactory->create();     $  bestSellerProdcutCollection->setModel('Magento\Catalog\Model\Product')->setPeriod('month');         $  datefrom = date('Y-m-d', strtotime('-'.$  from.' month'));     $  dateto = date('Y-m-d', strtotime('-'.$  to.' month'));     $  bestSellerProdcutCollection->addFieldToFilter('period',array('gt'=>$  datefrom));     $  bestSellerProdcutCollection->getSelect()->group('Product_Name')->order('Product_Name ASC');      return $  bestSellerProdcutCollection; }    

This returns a list of all the products from each month and everything is fine.

I get a list like this:

Product month quantity
A 12/2023 150
A 01/2024 200
A 02/2024 250
B 12/2023 500
B 01/2024 600
B 02/2024 500

This fine as I can put all these values in arrays and create my own individueal-style table and dashboard look.

The problem: Let’s say product A was out of stock in January and I made 0 sales with it. I want the report to be like this:

Product month quantity
A 12/2023 150
A 01/2024 0
A 02/2024 250
B 12/2023 500
B 01/2024 600
B 02/2024 500

However, since there is no data for product A in January, the whole month is being skipped and the data is like this:

Product month quantity
A 12/2023 150
A 02/2024 250
B 12/2023 500
B 01/2024 600
B 02/2024 500

Now I have a problem, since the data entries are not the same for every product and some data for some months is missing.

Is there a way to insert a 0 rather than skipping the month?

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