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Project specific array field in a MongoDB collection?
Let us first create a collection with documents −
> db.projectionAnElementDemo.insertOne( ... { ... "CustomerId":100, ... "CustomerDetails": [ ... { ... "CustomerName": "Chris", ... "CustomerCountryName": "US" ... }, ... { ... "CustomerName": "Robert", ... "CustomerCountryName": "UK" ... } ... ] ... } ... ); { "acknowledged" : true, "insertedId" : ObjectId("5cd31c56b64f4b851c3a13ea") }
Following is the query to display all documents from a collection with the help of find() method −
> db.projectionAnElementDemo.find().pretty();
This will produce the following output −
{ "_id" : ObjectId("5cd31c56b64f4b851c3a13ea"), "CustomerId" : 100, "CustomerDetails" : [ { "CustomerName" : "Chris", "CustomerCountryName" : "US" }, { "CustomerName" : "Robert", "CustomerCountryName" : "UK" } ] }
Following is the query to project element in array field −
> db.projectionAnElementDemo.find({},{CustomerId:1, "CustomerDetails.CustomerName":1}).pretty();
This will produce the following output −
{ "_id" : ObjectId("5cd31c56b64f4b851c3a13ea"), "CustomerId" : 100, "CustomerDetails" : [ { "CustomerName" : "Chris" }, { "CustomerName" : "Robert" } ] }
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