Is there a way in mongo to create user-defined Javascript functions. I have several Map/Reduce functions on the client side that i would like to use within other MR functions.
For example, several MR functions calculate all sorts of averages. I want to be able to use them like so :
function reduce(k,v)
{
if (val > myDatabaseAverage())
// ..do something
}
Use
db.system.js.save( { _id : "myDatabaseAverage" , value : function(){
// ..do something
} } );
That will store the JS function on the server and can be accessed by m/r from that point on.
For further examples see : mongo/jstests/core/mr_stored.js
db.system.js.insert() now.As mentioned by @Remon van Vliet,
You will have to use,
db.system.js.save( { _id : "myDatabaseAverage" ,
value : function(){ // ..do something }
} );
to save your function first,
and then you need to call,
db.loadServerScripts();
before you execute your function.
