Update existing certain documents in MongoDB collection without remove - php

Question

I am new in mongoDB so I need some help with this.
I have a collection for back up. It contains documents with following data:
{
"_id" : ObjectId("59f18942e7798954dc373b67"),
"category" : "building",
},
{
"_id" : ObjectId("59f18942e7798954dc373b68"),
"category" : "building",
},
{
"_id" : ObjectId("59f18942e7798954dc373b69"),
"category" : "tree",
"type" : 18,
},
{
"_id" : ObjectId("59f18942e7798954dc373b70"),
"category" : "book",
"type" : 18,
}
Then, for example, some of objects were changed and became like that:
{
"_id" : ObjectId("59f18942e7798954dc373b67"),
"category" : "building",
"size" : 100
},
{
"_id" : ObjectId("59f18942e7798954dc373b68"),
"category" : "building",
"size" : 400
},
{
"_id" : ObjectId("59f18942e7798954dc373b70"),
"category" : "book",
"type" : 18,
"title" : "New"
}
So I need to update them in my DB. Just replace, as I understood. I've read the docs about using 'upsert' and 'multi'. But I can't implement it.
How to do that?

Answer 1

Basic syntax for updating document in mongo is
db.collection.update(query,update,options);
For your question,
1.
db.collection.update({_id: ObjectId("59f18942e7798954dc373b67")},{$set:{size:100}});
2.
db.collection.update({_id: ObjectId("59f18942e7798954dc373b68")},{$set:{size:400}});
3.db.collection.update({_id: ObjectId("59f18942e7798954dc373b70")},{$set:{title:"New"}});
EDIT:
You can try out this, If you want to perform Write operation in one command:
> db.characters.bulkWrite(
> [
> { updateOne :
> {
> "filter" : { _id : ObjectId("59f18942e7798954dc373b67") },
> "update" : { $set : { size : 100 } }
> }
> },
> { updateOne :
> {
> "filter" : { _id : ObjectId("59f18942e7798954dc373b68") },
> "update" : { $set : { size : 400 } }
> }
> },
> { updateOne :
> {
> "filter" : { _id : ObjectId("59f18942e7798954dc373b68") },
> "update" : { $set: { title: "New"} }
> }
> },
> ]
>);