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MongoDB query to set a sub item in an array?
You can use positional $ operator. Let us first create a collection with documents −
> db.demo22.insertOne( ... { ... ProductId:101, ... ... ProductDetails: ... [ ... { ... ProductFirstPrice: '35', ... ProductSecondPrice: '75' ... }, ... { ... ProductFirstPrice: '', ... ProductSecondPrice:'' ... }, ... { ... ProductFirstPrice: '78', ... ProductSecondPrice:'24' ... } ... ] ... } ... ... ); { "acknowledged" : true, "insertedId" : ObjectId("5e14c0b422d07d3b95082e70") }
Display all documents from a collection with the help of find() method −
> db.demo22.find().pretty();
This will produce the following output −
{ "_id" : ObjectId("5e14c0b422d07d3b95082e70"), "ProductId" : 101, "ProductDetails" : [ { "ProductFirstPrice" : "35", "ProductSecondPrice" : "75" }, { "ProductFirstPrice" : "", "ProductSecondPrice" : "" }, { "ProductFirstPrice" : "78", "ProductSecondPrice" : "24" } ] }
Following is the MongoDB query to set a sub item in an array −
> db.demo22.update({ "ProductDetails.ProductFirstPrice" : "35" }, ... { $set : { "ProductDetails.$.ProductFirstPrice" : "" }}, false, true); WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
Display all documents from a collection with the help of find() method −
> db.demo22.find().pretty();
This will produce the following output −
{ "_id" : ObjectId("5e14c0b422d07d3b95082e70"), "ProductId" : 101, "ProductDetails" : [ { "ProductFirstPrice" : "", "ProductSecondPrice" : "75" }, { "ProductFirstPrice" : "", "ProductSecondPrice" : "" }, { "ProductFirstPrice" : "78", "ProductSecondPrice" : "24" } ] }
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