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I'm adding elements into an array("users") by using the $addToSet, but sometimes the array is null. Already tried to check if is null, and if it is use the $push, but I'm getting a The field 'users' must be an array but is of type null in document. Any ideas? This is the code I'm using:

    if(!userIsAssociated(campaign,user)){
    collection.updateOne(
            Filters.eq("_id", new ObjectId(id)),
            Updates.push("users", user));
    }
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  • Can you provide code for users array? Commented Sep 12, 2017 at 16:32
  • It's an array of strings. The problem is when user: null Commented Sep 12, 2017 at 16:56
  • correction: users:null Commented Sep 12, 2017 at 17:03
  • 2
    This will help. stackoverflow.com/questions/31770550/… Commented Sep 12, 2017 at 17:37
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