Getting the highest value of a column in MongoDB

Question

I\'ve been for some help on getting the highest value on a column for a mongo document. I can sort it and get the top/bottom, but I\'m pretty sure there is a better way to d

Answer 1

Sorting might be overkill. You can just do a group by

db.messages.group(
           {key: { created_at:true },
            cond: { active:1 },
            reduce: function(obj,prev) { if(prev.cmax