When i trying to make sort on map/reduce it fails with "db assertion failure"
I wrote code in python, here it is:

m = Code("""function() {
data = {};
res = ''
if(this.result_id) {
res=

{'objectid':this.result_id.toString()}

;
} else

{ res=this.result; }

emit(this.data, res);
}""")
r = Code("""function(k,values) {
data={};
for(var i=0; i<values.length; i++ )

{ for(attr in values[i]) data[attr]=values[i][attr]; }

return data
}""")

res = self.db.tasks.map_reduce(m,r,query=

{'job_id':job_id}

,sort=

{'position':pymongo.ASCENDING}

)

But when i turn off sorting it works pretty fine.