Merge branch 'writable' into rails

app/models/post.rb

@@ -348,6 +348,8 @@ class Post
 
   def update_attributes(hashable)
     hashable.to_hash.each do |attr, value|
+      next unless self[attr].writable?
+
       self[attr].value = value
     end
 
@@ -378,9 +380,7 @@ class Post
 
   # Ejecuta la acción de guardado en cada atributo.
   def save_attributes!
-    attributes.select do |attr|
-      self[attr].writable?
-    end.map do |attr|
+    attributes.map do |attr|
       self[attr].save
     end.all?
   end