add rough user attributes API

app/models/user.rb

@@ -3,6 +3,16 @@ class User
  
   devise :authenticatable, :recoverable, :rememberable, :trackable
   
-  key :use_attributes
-    
+  # key :use_attributes
+  
+  def method_missing(method)
+    safe_read(method)
+  end
+  
+  def safe_read(key)
+    self[key]
+    rescue MongoMapper::KeyNotFound
+      return ""
+  end
+  
 end

app/models/user_attribute.rb

@@ -2,7 +2,7 @@ class UserAttribute
   
   include MongoMapper::Document
   
-  key :ident, String
+  key :key, String
   key_i18n :name, String
   key_i18n :attrs, Array