Re: [mongodb-dev] Re: RFC: New modifier $setIfAbsent

[Scott Hernandez]

That is great you worked on this and got it going for your needs. I
would suggest creating a jira issue and linking/watching these:
https://jira.mongodb.org/browse/SERVER-4900
https://jira.mongodb.org/browse/SERVER-340

On Thu, Sep 6, 2012 at 2:15 AM, R.B. Boyer <are...@nexusvector.net> wrote:
> +1
>
> I frequently find myself in the same boat, wanting to set things like a
> "date_created" field on a doc but only on insert. I would love a feature
> like this.
>
>
> On Wednesday, September 5, 2012 3:38:48 PM UTC-7, Stephen Cuppett wrote:
>>
>> I opened pull request #298 a few days ago
>> (https://github.com/mongodb/mongo/pull/298)
>>
>> I was implementing a rate limiting and counting collection and found I
>> needed a way to upsert and provide "initial-only" values.
>>
>> The code to modify was straightforward enough and works good insofar as my
>> use case requires. Does anyone else have any opinions? Ideally, an entire
>> language construct similar to the behavior of MERGE INTO would be very
>> useful (one set of values for the update operation with potentially a
>> disjoint set of values when it is not found) at the atomic level. However,
>> for now, $setIfAbsent works good enough for me.
>>
>> I wasn't sure what other assets to provide along with the pull request. I
>> can work on unit tests, additions to the doc, etc. IOW, I will support
>> whatever it takes to get the code added correctly.
>>
>>
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[Alberto Lerner]

Also, we're in the process of rewriting the update code. You could
track it here:
https://jira.mongodb.org/browse/SERVER-5517

It'd be simple to include that operator in the new design.

Alberto.