Merge pull request #31 from nitindhar7/master

Made sort configurable with the original value as the default. Now it ca...

README.markdown

@@ -94,6 +94,14 @@ One can apply a "query" contraint, which takes a standard Mongo query object, to
 
     $ mongo test --eval "var collection = 'users', query = {'caredAbout':true}" variety.js
 
+### Analyze Documents Sorted in a particular order ###
+
+Perhaps you want to analyze a subset of documents sorted in an order other than creation order, say, for example, sorted by when documents were updated.
+
+One can apply a "sort" constraint, which analyzes documents in the specified order like so:
+
+    $ mongo test --eval "var collection = 'users', sort = { updated_at : -1 }" variety.js
+
 ##### "But my dad told me MongoDB is a schemaless database!" #####
 
 First of all, your father is a great guy. Moving on...

variety.js

@@ -60,6 +60,9 @@ print("Using limit of " + limit);
 if (typeof maxDepth === "undefined") { var maxDepth = 99; }
 print("Using maxDepth of " + maxDepth);
 
+if (typeof sort === "undefined") { var sort = {_id: -1}; }
+print("Using sort of " + tojson(sort));
+
 varietyCanHaveChildren = function (v) {
   var isArray = v && 
                 typeof v === 'object' && 
@@ -185,7 +188,7 @@ var addVarietyResults = function(result) {
 }
 
 // main cursor
-db[collection].find(query).sort({_id: -1}).limit(limit).forEach(function(obj) {
+db[collection].find(query).sort(sort).limit(limit).forEach(function(obj) {
   var recordResult = {};
   for (var key in obj) {
     if(obj.hasOwnProperty(key)) {