Mongo Aggregation Framework

[AussieFlem]

Hi Omar.

Just wondering if you're still working on MongoAS3, and if you're likely to add support for the Aggregation Framework introduced in MongoDB 2.1.0.

Cheers and thanks - love your work.

[s9tpepper]

Thanks, glad you're finding it useful! :)

Hm, I'm not yet familiar with these new features, I'm going to have to take a look at this stuff and see what it does, etc.

[AussieFlem]

It's great so far, other than the two issues/questions I posted :)

I tried using the aggregation stuff using a command, but couldn't work out if the result was returned with the opReply.
Am assuming the commands were generally for things like error messages rather than commands returning data...

[s9tpepper]

Well, the majority of the commands don't actually return data. I'm about to go read up on the aggregation stuff, but did you try using a getlasterror command after using the commdn like this?: https://gist.github.com/1074128#file_using_the_insert_method.as

The document you get from var document:Object = opReply.documents[0]; might have some of the information you're looking for.

[AussieFlem]

I traced through the whole opReply but couldn't see anything resembling a cursor or returned values - it returns "OK" in documents[0](amongst other things) so apparently I got the syntax right and it executed, but I suspect there's nowhere in the opReply structure to attach the return values like the Cursor.

Tried setting a cursor instead of an opReply for the listener, but got a type mismatch (as you'd expect)

[s9tpepper]

Do you know where there are details on this Aggregation Framework stuff?

I was looking at the Wire Protocol and I don't see anything new here:

http://www.mongodb.org/display/DOCS/Mongo+Wire+Protocol

So I'm not sure what I'd need to add to the driver to support this as I can't find information on this feature.

[s9tpepper]

I was just reading this page: http://www.mongodb.org/display/DOCS/Aggregation+Framework

It seems that if you do something like:

var document = documents[0];
if (document.ok == 1)
{
// document.result should have your data
}

I haven't tried this stuff, but did you try checking that result property?

[AussieFlem]

As I said I traced through the OpReply looking for a result but couldn't find it.

Could also be that I screwed up the query so it ran, but didn't return anything - I'll go back and see what I can find.

Appreciate you checking it out!