fixed overwrite bug when PUTing resources

lib/resource.js

@@ -50,7 +50,6 @@ module.exports = function (req, res, next, end) {
       } else {
         module.exec(req, function (err, data) {
           res.data = data;
-          
           next();
         })
       }

lib/storage.js

@@ -27,6 +27,23 @@ module.exports = require('mdoq')
     // build full mongodb url
     this.url = url + (path || this.url);
     
+    if(req.method === 'PUT' && req.resource && req.resource.type != 'Static') {
+      var oldBody = req.body
+        , body = {$set: oldBody.$set || {}};
+        
+      Object.keys(oldBody).forEach(function (p) {
+        if(p === '$set') return;
+        if(p && p[0] === '$') {
+          body[p] = oldBody[p];
+        } else {
+          body.$set[p] = oldBody[p];
+        }
+      })
+      
+      // rewrite body to $set
+      req.body = body;
+    }
+    
     end(mongo);
     next();
   })