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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
}
]
}
Updated on: 30-Jul-2019
588 Views
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