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Search for a text in MongoDBs Double Nested Array?
Search for a text in MongoDBs Double Nested Array with the help of dot(.) notation. Let us first create a collection. Following is the query to create a collection with documents
> db.doubleNestedArrayDemo.insertOne(
... {
... "StudentId" : "1000",
... "StudentName" : "Larry",
... "StudentDetails" : [
... {
... "ProjectName" : "Online Banking",
... "ProjectDetails" : [
... {
... "TechnologyUsed" : "Java"
... },
... {
... "TechnologyUsed" : "MySQL in Backend"
... }
... ]
... }
... ]
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5c992bd7330fd0aa0d2fe4cc")
}
> db.doubleNestedArrayDemo.insertOne( { "StudentId" : "1001", "StudentName" : "Robert", "StudentDetails" : [ { "ProjectName" : "Student Web Tracker", "ProjectDetails" : [ { "TechnologyUsed" : "Django Framework" }, { "TechnologyUsed" : "MongoDB in Backend" } ] } ] } );
{
"acknowledged" : true,
"insertedId" : ObjectId("5c992cdb330fd0aa0d2fe4cd")
}Following is the query to display all documents from a collection with the help of find() method
> db.doubleNestedArrayDemo.find().pretty()
This will produce the following output
{
"_id" : ObjectId("5c992bd7330fd0aa0d2fe4cc"),
"StudentId" : "1000",
"StudentName" : "Larry",
"StudentDetails" : [
{
"ProjectName" : "Online Banking",
"ProjectDetails" : [
{
"TechnologyUsed" : "Java"
},
{
"TechnologyUsed" : "MySQL in Backend"
}
]
}
]
}
{
"_id" : ObjectId("5c992cdb330fd0aa0d2fe4cd"),
"StudentId" : "1001",
"StudentName" : "Robert",
"StudentDetails" : [
{
"ProjectName" : "Student Web Tracker",
"ProjectDetails" : [
{
"TechnologyUsed" : "Django Framework"
},
{
"TechnologyUsed" : "MongoDB in Backend"
}
]
}
]
}Following is the query to search in a double nested array. We are finding the record with text “Java”
>db.doubleNestedArrayDemo.find({"StudentDetails.ProjectDetails.TechnologyUsed":"Java"}).pretty();This will produce the following output
{
"_id" : ObjectId("5c992bd7330fd0aa0d2fe4cc"),
"StudentId" : "1000",
"StudentName" : "Larry",
"StudentDetails" : [
{
"ProjectName" : "Online Banking",
"ProjectDetails" : [
{
"TechnologyUsed" : "Java"
},
{
"TechnologyUsed" : "MySQL in Backend"
}
]
}
]
}
Updated on: 30-Jul-2019
77 Views
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