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MongoDB - Atomic Operations


MongoDB does now not guide multi-report atomic transactions.

it does provide atomic operations on a unmarried record.

Model Data for Atomic Operations

The advocated method to hold atomicity would be to keep all the related facts, which is often updated together in a unmarried document using embedded files. Consider the subsequent merchandise report

    "_id":1,
    "product_name": "Google Pixel 3 Just Black 128",
    "category": "mobiles",
    "product_total": five,
    "product_available": three,
    "product_bought_by": [
        
            "customer": "David",
            "date": "4-Oct-2018"
        ,
        
            "customer": "Anderson",
            "date": "5-Oct-2018"
        
    ]

Here purchaser who buys the product within the product_bought_by discipline.Whenever a new purchaser buys the product, we will first test if the product is still to be had the usage of product_available discipline. But We can use findAndModify command for this capability because it searches and updates the report inside the identical pass.
>db.products.findAndModify( 
   question:_id:2,product_available:$gt:0, 
   replace: 
      $inc:product_available:-1, 
      $push:product_bought_by:customer:"rob",date:"nine-Jan-2014" 
       
)
findAndModify question makes sure that the product purchase data is updated only if it the product is available.



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