safer conditional

Author: JulienMichelFr

src/ActiveRecord.js

@@ -205,7 +205,7 @@ export default function ActiveRecord (model, name) {
           if (_.isArray(obj[ key ])) {
             obj[ key ] = _.compact(obj[ key ].map((val) => {
               if (typeof(val) === 'object') {
-                return field.nested || _.get(field, [0, 'nested']) ? val : val._id;
+                return (field.nested || _.get(field, [0, 'nested'])) ? val : val._id;
               } else if (typeof(val) === 'string') {
                 return val;
               }