Implement group

lib/collection.js

@@ -224,27 +224,10 @@ Collection.prototype.isCapped = function (cb) {
 }
 
 Collection.prototype.group = function (doc, cb) {
-  var cmd = {
-    group: {
-      ns: this._name,
-      key: doc.key,
-      initial: doc.initial,
-      $reduce: new Code(doc.reduce.toString()),
-      out: 'inline',
-      cond: doc.cond
-    }
-  }
-
-  if (doc.finalize) cmd.group.finalize = new Code(doc.finalize.toString())
-  if (doc.keys) cmd.group.$keyf = new Code(doc.keys.toString())
-
   var self = this
-  this._getConnection(function (err, server) {
+  this._getConnection(function (err, connection) {
     if (err) return cb(err)
-    server.command(self._dbname + '.$cmd', cmd, function (err, result) {
-      if (err) return cb(err)
-      cb(null, result.result.retval)
-    })
+    connection.collection(self._fullColName()).group(doc.key || doc.keyf, doc.cond, doc.initial, doc.reduce, doc.finalize, cb)
   })
 }