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How do I display a list of objects based on a specific property with MongoDB?
To display a list of objects based on a specific property, use dot notation in find(). Let us create a collection with documents −
> db.demo455.insertOne({"Information":{"Student":[{"Name":"Chris","Age":22}]}});{ "acknowledged" : true, "insertedId" : ObjectId("5e7e1876dbcb9adb296c95c5") } > db.demo455.insertOne({"Information":{"Student":[{"Name":"David","Age":21}]}});{ "acknowledged" : true, "insertedId" : ObjectId("5e7e1883dbcb9adb296c95c6") } > db.demo455.insertOne({"Information":{"Student":[{"Name":"Bob","Age":24}]}});{ "acknowledged" : true, "insertedId" : ObjectId("5e7e188adbcb9adb296c95c7") } > db.demo455.insertOne({"Information":{"Student":[{"Name":"Robert","Age":21}]}});{ "acknowledged" : true, "insertedId" : ObjectId("5e7e18bcdbcb9adb296c95c8") }
Display all documents from a collection with the help of find() method −
> db.demo455.find();
This will produce the following output −
{ "_id" : ObjectId("5e7e1876dbcb9adb296c95c5"), "Information" : { "Student" : [ { "Name" : "Chris", "Age" : 22 } ] } } { "_id" : ObjectId("5e7e1883dbcb9adb296c95c6"), "Information" : { "Student" : [ { "Name" : "David", "Age" : 21 } ] } } { "_id" : ObjectId("5e7e188adbcb9adb296c95c7"), "Information" : { "Student" : [ { "Name" : "Bob", "Age" : 24 } ] } } { "_id" : ObjectId("5e7e18bcdbcb9adb296c95c8"), "Information" : { "Student" : [ { "Name" : "Robert", "Age" : 21 } ] } }
Following is the query to display a list of objects based on a specific property −
> db.demo455.find({"Information.Student.Age":21});
This will produce the following output −
{ "_id" : ObjectId("5e7e1883dbcb9adb296c95c6"), "Information" : { "Student" : [ { "Name" : "David", "Age" : 21 } ] } } { "_id" : ObjectId("5e7e18bcdbcb9adb296c95c8"), "Information" : { "Student" : [ { "Name" : "Robert", "Age" : 21 } ] } }
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