fix: only alias field if field is different

lib/model.js

@@ -1726,7 +1726,7 @@ module.exports = (function() {
         // Object lookups will force any variable to strings, we don't want that for special objects etc
         if (typeof attr !== "string") return attr;
         // Map attributes to aliased syntax attributes
-        if (Model.rawAttributes[attr] && Model.rawAttributes[attr].field) {
+        if (attr !== Model.rawAttributes[attr].field) {
           return [Model.rawAttributes[attr].field, attr];
         }
         return attr;
@@ -1750,7 +1750,7 @@ module.exports = (function() {
       if (attributes) {
         for (attribute in attributes) {
           rawAttribute = Model.rawAttributes[attribute];
-          if (rawAttribute && rawAttribute.field && rawAttribute.field !== rawAttribute.fieldName) {
+          if (rawAttribute && rawAttribute.field !== rawAttribute.fieldName) {
             attributes[Model.rawAttributes[attribute].field] = attributes[attribute];
             delete attributes[attribute];
           }