Passing Arguments to MapReduce

[marcus]

Is it possible to pass arguments to the map function in a mapreduce
call?

Something like this does not work for me:

> results = db.runCommand({mapreduce: "things", map:m('dog'),reduce:r});
undefined
Sun Nov 1 18:44:12 JS Error: TypeError: str has no properties (shell):
3

> results = db.runCommand({mapreduce: "things", map:m,reduce:r});
{
"result" : "tmp.mr.things_1257122656_17",
"timeMillis" : 34,
"counts" : {
"input" : 3,
"emit" : 2,
"output" : 2
},
"ok" : 1
}

Thanks,
Marcus

[Eliot Horowitz]

No - no way to do that yet.
Added a case though: http://jira.mongodb.org/browse/SERVER-401

[marcus]

Slated for 1.1.4!... Awesome! Thanks... it should really help with
the project I'm working on.

Marcus

[VJ]

Hello.  I know that this is a really old ticket, but I'm having the same problem.  Does anyone have an example of passing a parameter into a map function?

Thanks.

[Sam Millman]

You add them in the scope property of the of the MR call: http://www.mongodb.org/display/DOCS/MapReduce

They go into globa so passing (in PHP):

array('woop' => $cheese)

will be "woop" in your map.

If you are having problems understanding can you paste your MR call and map?

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