MongoDB-তে একাধিক শর্ত সহ অ্যারে কীভাবে আপডেট করবেন

একাধিক শর্ত সহ অ্যারে আপডেট করতে, MongoDB-তে $push ব্যবহার করুন। আসুন নথি-

> db.demo94.insertOne(
... {
...
...    "Details" : [
...       {
...          "Name" : "Chris",
...          "Subject" : []
...       },
...       {
...          "Name" : "David",
...          "Subject" : []
...       },
...       {
...          "Name" : "Bob",
...          "Subject" : []
...       }
...    ]
... }
... );
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5e2d553bb8903cdd865577a9")
}

Find() পদ্ধতি -

> db.demo94.find();

এটি নিম্নলিখিত আউটপুট −

{
   "_id" : ObjectId("5e2d553bb8903cdd865577a9"), "Details" : [
      { "Name" : "Chris", "Subject" : [ ] },
      { "Name" : "David", "Subject" : [ ] }, { "Name" : "Bob", "Subject" : [ ] }
   ]
}

MongoDB −

> db.demo94.updateOne(
... {
...
...    "Details": { "$elemMatch": { "Name": "David"}}
... },
... {
...    "$push": { "Details.$.Subject": { "Subject": "MongoDB" }}
... }
...);
{ "acknowledged" : true, "matchedCount" : 1, "modifiedCount" : 1 }

Find() পদ্ধতি -

> db.demo94.find();

এটি নিম্নলিখিত আউটপুট −

{
   "_id" : ObjectId("5e2d553bb8903cdd865577a9"), "Details" : [
      { "Name" : "Chris", "Subject" : [ ] },
      { "Name" : "David", "Subject" : [ { "Subject" : "MongoDB" } ] },
      { "Name" : "Bob", "Subject" : [ ] }
   ] 
}