updated MongoStatement to return retval on db.eval

model/MongoStatement.php

@@ -60,6 +60,9 @@ class MongoStatement extends DbStatement
         if (!$this->result) {
             return false;
         }
+        if (isset($this->result['retval'])) {
+            return $this->result['retval'];
+        }
 
         $row = false;
         switch ($style) {
@@ -112,6 +115,8 @@ class MongoStatement extends DbStatement
             } else {
                 return false;
             }
+        } elseif (is_int($this->result)) {
+            return $this->result;
         }
         return false;
     }
@@ -151,6 +156,8 @@ class MongoStatement extends DbStatement
                 if (is_array($result) && isset($result['values'])) {
                     $this->result = $result['values'];
                 }
+            } elseif (is_int($result)) {
+                $this->result = $result;
             }
             if ($request instanceof InsertMongoCommand) {
                 $this->insertId = $request->getInsertId();