Adds mongodb support for ORM query comparators

The only one that I'm not sure is ok is LIKE => $regex

Author: dresende

lib/Drivers/DML/mongodb.js

@@ -183,6 +183,35 @@ function convertToDB(obj) {
 			continue;
 		}
 
+		if (typeof obj[k].sql_comparator == "function") {
+			var val       = (k != "_id" ? obj[k].val : new mongodb.ObjectID(obj[k].val));
+			var comp      = obj[k].sql_comparator();
+			var condition = {};
+
+			switch (comp) {
+				case "gt":
+				case "gte":
+				case "lt":
+				case "lte":
+				case "ne":
+					condition["$" + comp] = val;
+					break;
+				case "eq":
+					condition = val;
+					break;
+				case "between":
+					condition["$min"] = obj[k].from;
+					condition["$max"] = obj[k].to;
+					break;
+				case "like":
+					condition["$regex"] = obj[k].expr.replace("%", ".*");
+					break;
+			}
+
+			obj[k] = condition;
+			continue;
+		}
+
 		if (k == "_id") {
 			obj[k] = new mongodb.ObjectID(obj[k]);
 		}