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Extract a MongoDB document with a specific string
To extract a MongoDB document with a specific string, use $match in MongoDB. Let us create a collection with documents −
> db.demo424.insert( ... { ... ... "Information" : [ ... { ... id:10, ... Name:"Chris" ... }, ... { ... id:11, ... Name:"David" ... } ... ] ... } ... ) WriteResult({ "nInserted" : 1 }) > > db.demo424.insert( ... { ... ... "Information" : [ ... { ... id:101, ... Name:"Mike" ... }, ... { ... id:102, ... Name:"John" ... } ... ] ... } ... ) WriteResult({ "nInserted" : 1 })
Display all documents from a collection with the help of find() method −
> db.demo424.find();
This will produce the following output −
{ "_id" : ObjectId("5e74eb9dbbc41e36cc3cae6a"), "Information" : [ { "id" : 10, "Name" : "Chris" }, { "id" : 11, "Name" : "David" } ] } { "_id" : ObjectId("5e74eb9ebbc41e36cc3cae6b"), "Information" : [ { "id" : 101, "Name" : "Mike" }, { "id" : 102, "Name" : "John" } ] }
Following is the query to extract a MongoDB document with a specific string −
> db.demo424.aggregate( ... [ { $match : { "Information.Name": "Chris" } } ] ... );
This will produce the following output −
{ "_id" : ObjectId("5e74eb9dbbc41e36cc3cae6a"), "Information" : [ { "id" : 10, "Name" : "Chris" }, { "id" : 11, "Name" : "David" } ] }
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