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How to get all docs which contain another doc in an array with MongoDB?
For this, simply use dot notation with find() in MongoDB. Let us create a collection with documents −
> db.demo465.insertOne(
... {
... id: 101,
... details: [{
... Name: "Chris",
... Info: {
... Subject: "MongoDB",
... Marks:67
... }
... }, {
... Name: "David",
... Info: {
... Subject: "MySQL",
... Marks:78
... }
... }]
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5e80421bb0f3fa88e2279061")
}
>
> db.demo465.insertOne(
... {
... id: 102,
... details: [{
... Name: "Bob",
... Info: {
... Subject: "Java",
... Marks:45
... }
... }, {
... Name: "Carol",
... Info: {
... Subject: "C",
... Marks:67
... }
... }]
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5e80421cb0f3fa88e2279062")
}Display all documents from a collection with the help of find() method −
> db.demo465.find();
This will produce the following output −
{ "_id" : ObjectId("5e80421bb0f3fa88e2279061"), "id" : 101, "details" : [ { "Name" : "Chris",
"Info" : { "Subject" : "MongoDB", "Marks" : 67 } }, { "Name" : "David", "Info" : { "Subject" :
"MySQL", "Marks" : 78 } } ] }
{ "_id" : ObjectId("5e80421cb0f3fa88e2279062"), "id" : 102, "details" : [ { "Name" : "Bob",
"Info" : { "Subject" : "Java", "Marks" : 45 } }, { "Name" : "Carol", "Info" : { "Subject" : "C",
"Marks" : 67 } } ] }Following is the query to get all docs which contain another doc in an array −
> db.demo465.find({"details.Name":"Bob"});This will produce the following output −
{ "_id" : ObjectId("5e80421cb0f3fa88e2279062"), "id" : 102, "details" : [ { "Name" : "Bob",
"Info" : { "Subject" : "Java", "Marks" : 45 } }, { "Name" : "Carol", "Info" : { "Subject" : "C",
"Marks" : 67 } } ] }
Updated on: 11-May-2020
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