Re: [mongodb-user] Updating an element in an array using mongodb java driver

[Sam Millman]

You can check for the $exists of the qestions.questionID value and update only if it does not exist using the $push operator for the update as in the last post.

On 12 October 2012 16:06, RK <ero...@gmail.com> wrote:

Hi,

My collection is something like this,

{
    "_id" : ObjectId("5077e898e4b05e76f3b6f392"),
   
    "questions" : [
        {
            "questionID" : 1,
            "section" : "general"
        },
       
    ]
}

I wanted to update questions array based on the users visit, suppose if user visits
question#2 then one more element should be added to the document like this,

{
    "_id" : ObjectId("5077e898e4b05e76f3b6f392"),
    "_class" : "com.citizenshipschool.domain.PracticeQuestion",
    "questions" : [
        {
            "questionID" : 1,
            "section" : "general"
        },
        {
            "questionID" : 2,
            "section" : "science"
        }
    ]
}

But if I use save() question #1 is getting updated with question #2 instead of
appending to it.

Also if user again visits a page which is already in the questions array for e.g. question #1
then the document shouldn't get updated.

Is there a way to achieve this using the mongodb java driver.

Thanks for any suggesstions

RK

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[Jeremy Mikola]

Cross-referencing this with a duplicate mailing list post that was also answered: https://groups.google.com/forum/?fromgroups=#!topic/mongodb-user/jXApSipw0HQ