node-js

db.food.updateMany(
{ sold: { $lt: 10 } },
{ $set: { sold: 55 } }
)
This operation updates all documents (in a 'food' collection) where sold is lesser than 10 *(1st
parameter) by setting sold to 55. It then returns a WriteResult object that looks like this:
{ "acknowledged" : true, "matchedCount" : a, "modifiedCount" : b }
a = Number of matched documents
b = Number of modified documents
ReplaceOne
Replaces the first matching document (replacement document)
This example collection called countries contains 3 documents:
{ "_id" : 1, "country" : "Sweden" }
{ "_id" : 2, "country" : "Norway" }
{ "_id" : 3, "country" : "Spain" }
The following operation replaces the document { country: "Spain" } with document { country:
"Finland" }
db.countries.replaceOne(
{ country: "Spain" },
{ country: "Finland" }
)
And returns:
{ "acknowledged" : true, "matchedCount" : 1, "modifiedCount" : 1 }
The example collection countries now contains:
{ "_id" : 1, "country" : "Sweden" }
{ "_id" : 2, "country" : "Norway" }
{ "_id" : 3, "country" : "Finland" }
Deleting
Deleting documents from a collection in mongoose is done in the following manner.
Auto.remove({_id:123}, function(err, result){
if (err) return console.error(err);
https://riptutorial.com/ 212