Pull or pullAll? to delete Array of emails?

Working with Data
, ,
2

Hello : )

I think this will work.

var delete_emails = [{"email" :tim@apple.com"}, {"email" : "gates@microsoft.com"},{"email" : "elon@tesla.com"}];

collection(“users”).findOneAndUpdate({_id : ObjectId(userId)}, {$pullAll : {contacts : delete_emails }},{multi:true});

I haven’t tested it see examples also in docs.

You can also use pipeline updates that are more powerful,but i dont think you need it here.You can use something like the bellow(add the filter,bellow is only the update)
For more complicated updates you can use $filter with a pipeline update.With filter you could do it as.

[ {
  "$addFields" : {
    "contacts" : {
      "$filter" : {
        "input" : "$contacts",
        "as" : "contact",
        "cond" : {
          "$not" : [ {
            "$in" : [ "$$contact.email", ["tim@apple.com", "gates@microsoft.com","elon@tesla.com"]]
          } ]
        }
      }
    }
  }
} ]

We don’t have sets in mongodb we only have arrays,so we cant do the check in O(1)
Unless mongodb converts it to a set internally,i dont know if it does.