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Find documents with arrays not containing a document with a particular field value in MongoDB?
You can use $nin operator for this. To understand the concept, let us create a collection with the document. The query to create a collection with a document is as follows −
> db.documentWithAParticularFieldValueDemo.insertOne( ... { ... ... "StudentId" : 101, ... "StudentDetails" : ... [ ... { ... "TheoryMarks": 78, ... "PracticalMarks": 91 ... }, ... { ... "TheoryMarks": 75, ... "PracticalMarks": 75 ... } ... ] ... } ... ); { "acknowledged" : true, "insertedId" : ObjectId("5c8edab72f684a30fbdfd586") } > db.documentWithAParticularFieldValueDemo.insertOne( ... ... { "StudentId" : 102, ... "StudentDetails" : [ ... { ... "TheoryMarks": 91, ... "PracticalMarks": 91 ... }, ... { ... "TheoryMarks": 75, ... "PracticalMarks": 75 ... } ... ] ... } ... ); { "acknowledged" : true, "insertedId" : ObjectId("5c8edaf12f684a30fbdfd587") }
Display all documents from a collection with the help of find() method. The query is as follows −
> db.documentWithAParticularFieldValueDemo.find().pretty();
The following is the output −
{ "_id" : ObjectId("5c8edab72f684a30fbdfd586"), "StudentId" : 101, "StudentDetails" : [ { "TheoryMarks" : 78, "PracticalMarks" : 91 }, { "TheoryMarks" : 75, "PracticalMarks" : 75 } ] } { "_id" : ObjectId("5c8edaf12f684a30fbdfd587"), "StudentId" : 102, "StudentDetails" : [ { "TheoryMarks" : 91, "PracticalMarks" : 91 }, { "TheoryMarks" : 75, "PracticalMarks" : 75 } ] }
Here is the query to find documents with arrays not containing a document with a particular field value in MongoDB −
> db.documentWithAParticularFieldValueDemo.find({'StudentDetails.TheoryMarks': {$nin: [78]}}).pretty();
The following is the output −
{ "_id" : ObjectId("5c8edaf12f684a30fbdfd587"), "StudentId" : 102, "StudentDetails" : [ { "TheoryMarks" : 91, "PracticalMarks" : 91 }, { "TheoryMarks" : 75, "PracticalMarks" : 75 } ] }
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