Question

I have this JSON and you can see under products i have barcodes for each product what i want to do is only get the information that matches the product barcode

{
  "company": "village",
  "logo": "http:\/\/www.incard.com.au\/newsite\/template\/images\/movieticket\/4cinemas\/villagetop.png",
  "products": [
    {
      "barcode": "236690091",
      "name": "Weekday",
      "logo-URL": "http: \/\/www.incard.com.au\/newsite\/template\/images\/movieticket\/4cinemas\/ticketpic1.png",
      "price": "12.50",
      "discount": "1.50"
    },
    {
      "barcode": "236690092",
      "name": "Weekend",
      "logo-URL": "http: \/\/www.incard.com.au\/newsite\/template\/images\/movieticket\/4cinemas\/ticketpic1.png",
      "price": "13.50",
      "discount": "1.60"
    },
    {
      "barcode": "236690093",
      "name": "Gold Class",
      "logo-URL": "http: \/\/www.incard.com.au\/newsite\/template\/images\/movieticket\/4cinemas\/ticketpic1.png",
      "price": "13.50",
      "discount": "1.60"
    }
  ],
  "store_name": "movies"
}

for example If i hit 236690091 I only what the database (MongoDB) to return

"barcode": "236690091",
      "name": "Weekday",
      "logo-URL": "http: \/\/www.incard.com.au\/newsite\/template\/images\/movieticket\/4cinemas\/ticketpic1.png",
      "price": "12.50",
      "discount": "1.50"

not every product.

This is what I have tried

public function getbarcode($barcode)
    {
        // select a collection (analogous to a relational database's table)
         $collection = $this->db->movies->products;

        // find everything in the collection
        $cursor = $collection->find(array("barcode" =>"{$barcode}"));

        $test = array();
            // iterate through the results
            while( $cursor->hasNext() ) {
                $test[] = ($cursor->getNext());
            }
        //Print Results 
        print json_encode($test);

    }

Answer 1

You can’t do this. MongoDB will always return the full document and will not allow you to return only a nested part that you want to search against. I would suggest to split out the products into its own collection, and then add the company info to each product. This will also circumvent the 16MB document limit in case you have lots of products for each company.

Without changing your schema, the following code should work:

public function getbarcode($barcode)
{
    $products = array();
    $collection = $this->db->movies->products;

    foreach( $collection->find( array( 'products.barcode' => $barcode ) ) as $item )
    {
        foreach( $item->products as $product )
        {
            if ( $product['barcode'] == $barcode )
            {
                $products[] = $item;
            }
        }
    }
    return $products;
}